Windshield not operable

Excellent diagnostics by our resident Pro Expert Jeff, which should be down here. It makes the question solved and will appear in a search of the site as 'Solved'. It also gives you points and awards.

• Jeff Armer Nov 17, 2021
• could be the wiper relay contacts are stuck closed causing power (battery voltage ) to be supplied all the time ,or a problem with the GEM module .
  
  Windshield Wiper
  
  The windshield wiper system consists of the following parts:
  
  Windshield wiper arms (2)
  Windshield wiper motor on the air cowl trim panel
  Windshield wiper linkage
  Windshield wiper blades (2)
  Wiper relay, in the central junction box (CJB)
  Generic electronic module (GEM)
  Wiper/washer switch (part of the multi-function switch), consisting of:
  wiper switch
  washer switch (pressure switch) and
  delay control switch (rotary switch, depending on model)
  
  Inspection and Verification
  
  Verify the customer concern.
  Visually inspect for obvious signs of mechanical and electrical damage:
  
  
  Visual Inspection Chart Mechanical Electrical
  Wiper blades
  Front wiper linkage
  Fluid reservoir - windshield washing system (level)
  Hoses
  Nozzles
  Central junction box (CJB) fuse(s):
  43 (15A)
  56 (20A)
  Pump
  Wiper/washer switch
  Windshield wiper relay
  Rear wiper relay
  Generic electronic module (GEM)
  Circuitry
  
  
  
  If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  If the cause is not visually evident, connect the scan tool to the data link connector (DLC) and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
  check that the program card is correctly installed.
  check the connections to the vehicle.
  check the ignition switch position.
  If the scan tool still does not communicate with the vehicle, refer to the scan tool operating manual.
  Carry out the scan tool data link test. If the scan tool responds with:
  ISO or CAN circuit fault; all electronic control units no response/not equipped, refer to Section 418-00 .
  No response/not equipped for GEM, refer to Section 419-10 .
  System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the GEM.
  If the DTCs retrieved are related to the concern, go to the Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index.
  If no DTCs related to the concern are retrieved, GO to Symptom Chart .
• 
  Jeff Armer Nov 17, 2021
  B1438 Wiper Mode Select Switch Circuit Failure GEM Go To Pinpoint Test H .
  B1446 Wiper Park Sense Circuit Failure GEM Go To Pinpoint Test G .
  B1451 Wiper Wash/Delay Switch Circuit Failure GEM Go To Pinpoint Test H .
  B1611 Wiper Rear Mode Select Switch Failure GEM Go To Pinpoint Test F .
  B2107 Front Wiper Motor Relay Circuit Short To Battery GEM Go To Pinpoint Test H .
  B2110 Front Wiper Motor Relay Circuit Open GEM Go To Pinpoint Test H
  
  
  checking for codes in the gem module mite point you into a diagnostic direction .
  
  The wipers stay on continuously
  Wiper/washer switch
  Windshield wiper motor
  Windshield wiper relay
  Generic electronic module (GEM)
  Central junction box (CJB)
  Circuitry
  Go To Pinpoint Test B .
  
  Pinpoint Test B: The Wipers Stay On Continuously
  
  Normal Operation
  When low speed operation is selected, the windshield wiper motor receives voltage through circuit 32-KA10 (WH/GN). When high speed operation is selected, the windshield wiper motor receives voltage through circuit 32-KA11 (WH/BK). When intermittent operation is selected, the generic electronic module (GEM) sends an intermittent ground signal to the windshield wiper relay through circuit 91S-KA12 (BK/WH). The relay energizes and sends voltage to the wiper/washer switch through circuit 32-KA19 (WH/BK). The wiper/washer switch sends voltage to the windshield wiper motor through circuit 32-KA10 (WH/GN). When the wiper/washer switch is turned to the off position, or between intermittent pulses, the internal run/park switch in the windshield wiper motor provides voltage to the windshield wiper relay through circuit 32-KA9 (WH/BU) until the wiper motor completes its cycle and opens the circuit
  
  Possible Causes
  Circuit 32-KA10 (WH/GN) short to voltage
  Circuit 32-KA11 (WH/BK) short to voltage
  Circuit 32-KA19 (WH/BK) short to voltage
  Circuit 91S-KA12 (BK/WH) short to ground
  Wiper/washer switch
  Windshield wiper motor
  Windshield wiper relay
  Central junction box (CJB)
  GEM
  
  
  PINPOINT TEST B: THE WIPERS STAY ON CONTINUOUSLY
  Test Step Result / Action to Take
  B1 DETERMINE THE WIPE SPEED
  Move the wiper lever to the OFF position.
  Key in ON position.
  Do the windshield wipers move at a fast rate?
  Yes
  GO to B2 .
  
  No
  GO to B4 .
  B2 CHECK THE WIPER/WASHER SWITCH FOR NORMAL OPERATION
  Key in OFF position.
  Disconnect: Wiper/Washer Switch C2081.
  Key in ON position.
  Do the windshield wipers move at a fast rate?
  Yes
  GO to B3 .
  
  No
  CHECK the wiper/washer switch for correct operation.
  Refer to Wiring Diagrams Cell 149 for schematic and connector information.
  
  If necessary, INSTALL a new multi-function switch. REFER to Section 211-05 . TEST the system for normal operation.
  B3 CHECK CIRCUIT 32-KA11 (WH/BK) FOR A SHORT TO VOLTAGE
  Key in OFF position.
  Disconnect: Windshield Wiper Motor C125.
  Key in ON position.
  Measure the voltage between wiper/washer switch C2081-8, circuit 32-KA11 (WH/BK), harness side and ground.
  
  Is the voltage greater than 10 volts?
  Yes
  REPAIR the circuit. TEST the system for normal operation.
  
  No
  INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield in this section. TEST the system for normal operation.
  B4 CHECK THE WIPER/WASHER SWITCH FOR NORMAL OPERATION
  Key in OFF position.
  Disconnect: Wiper/Washer Switch C2081.
  Key in ON position.
  Do the front wipers move at a slow rate?
  Yes
  GO to B5 .
  
  No
  GO to B6 .
  B5 CHECK CIRCUIT 32-KA10 (WH/GN) FOR A SHORT TO VOLTAGE
  Key in OFF position.
  Disconnect: Windshield Wiper Motor C125.
  Key in ON position.
  Measure the voltage between wiper/washer switch C2081-9, circuit 32-KA10 (WH/GN), harness side and ground.
  
  Is the voltage greater than 10 volts?
  Yes
  REPAIR the circuit. TEST the system for normal operation.
  
  No
  INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield in this section. TEST the system for normal operation.
  B6 CARRY OUT THE WIPER/WASHER SWITCH COMPONENT TEST
  Carry out the wiper/washer switch component test.
  Refer to Wiring Diagrams Cell 149 for schematic and connector information.
  
  Does the wiper/washer switch pass the component test?
  Yes
  GO to B7 .
  
  No
  INSTALL a new multi-function switch. REFER to Section 211-05 . TEST the system for normal operation.
  B7 CHECK CIRCUIT 32-KA19 (WH/BK) FOR A SHORT TO VOLTAGE
  Key in OFF position.
  Connect: Wiper/Washer Switch C2081.
  Disconnect: CJB C270c.
  Key in ON position.
  Do the windshield wipers move at a slow rate?
  Yes
  REPAIR the circuit. TEST the system for normal operation.
  
  No
  GO to B8 .
  B8 CHECK THE CJB FOR A SHORT TO VOLTAGE
  Key in OFF position.
  Disconnect: Windshield Wiper Relay C2042.
  Connect: CJB C270c.
  Key in ON position.
  Do the windshield wipers move at a slow rate?
  Yes
  INSTALL a new CJB. TEST the system for normal operation.
  
  No
  GO to B9 .
  B9 CHECK THE WINDSHIELD WIPER RELAY
  Carry out the windshield wiper relay component test.
  Refer to Wiring Diagrams Cell 149 for schematic and connector information.
  
  Does the windshield wiper relay function normally?
  Yes
  GO to B10 .
  
  No
  INSTALL a new windshield wiper relay. TEST the system for normal operation.
  B10 CHECK CIRCUIT 91S-KA12 (BK/WH) FOR A SHORT TO GROUND
  Key in OFF position.
  Connect: Windshield Wiper Relay C2042.
  Disconnect: GEM C201e.
  Key in ON position.
  Do the windshield wipers move at a slow rate?
  Yes
  REPAIR the circuit. TEST the system for normal operation.
  
  No
  GO to B11 .
  B11 CHECK FOR CORRECT GEM OPERATION
  Disconnect all the GEM connectors.
  Check for:
  corrosion.
  pushed-out pins.
  Connect all the GEM connectors and make sure they seat correctly.
  Operate the system and verify the concern is still present.
  Is the concern still present?
  Yes
  INSTALL a new GEM. REFER to Section 419-10 . TEST the system for normal operation.
  
  No
  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  

Wiper/Washer System Components
The Wiper/Washer System consists of the following electrical components:
• Accessory relay
• Heated washer nozzles w/XA7
• WASH NOZ 10A fuse
• Windshield washer fluid level switch
• Windshield washer pump motor
• Windshield wiper motor
• Windshield wiper motor module
• Windshield wiper/washer switch
• Wiper/washer switch 10A fuse
• Wiper motor 30A fuse

Wiper/Washer System Operation
The windshield wiper motor module is part of the windshield wiper motor cover and controls wiper motor operation. The accessory voltage supply circuit to the windshield wiper motor assembly is used to operate the wiper motor in all modes. The windshield wiper motor is a 2 speed motor and is operated at low speed in all modes except HIGH. The accessory voltage supply circuit to the windshield wiper/washer switch is used to supply the windshield wiper switch signal circuits. The windshield wiper switch signal circuit voltage levels to the wiper motor module determine the wiper motor operating mode.
When the wiper/washer switch is in the LOW position voltage is supplied through a 24K ohm resistor within the switch to the windshield wiper switch signal 2 circuit, and accessory voltage is supplied to the windshield wiper switch signal 1 circuit. The reduced voltage from the wiper switch signal 2 circuit and accessory voltage from the wiper switch signal 1 circuit causes the wiper motor module to close the wiper motor accessory voltage supply circuit to the wiper motor low speed terminal.

The is the symptom of a defective wiper switch.

Principles of Operation
The windshield wiper motor receive inputs from the following:

• multifunction switch
• lighting control module (LCM)
• ignition switch
• battery junction box (BJB)
• central junction box (CJB)

The following components are integrated into the windshield wiper motor:

• windshield wiper motor module
• high/low speed relay
• run/park sensor (Hall effect)
• washer pump relay

High Speed Windshield Wipers
High speed is activated when the multifunction switch supplies ground to the windshield wiper motor module inputs. The windshield wiper motor module then supplies ground to the run/park sensor and high/low relay coil, activating the relay with voltage supplied from the ignition switch (RUN/ACC) through the central junction box (CJB). When the windshield wiper motor module receives voltage from the run/park sensor, it removes ground from the run/park sensor, deactivating it. The windshield wiper motor continues to operate from voltage connected through the run/park sensor until the Hall effect senses the magnet in the motor. When the Hall effect senses the magnet in motor the windshield wiper motor returns to the park position, the internal run/park sensor grounds the windshield wiper motor module input and the windshield wiper motor module removes ground from the windshield wiper high/low relay coil, deactivating the high/low relay and windshield wiper motor. The windshield wiper motor module continues to cycle the windshield wipers until the inputs from the multifunction switch are changed from the high speed position.
Low Speed Windshield Wipers
Low speed is activated when the multifunction switch supplies a specific ground to the speed inputs of the windshield wiper motor module. The windshield wiper motor module then supplies ground to only the windshield wiper run/park relay coil, activating it. When the windshield wiper run/park relay is activated, the deactivated windshield high/low relay connects voltage to the windshield wiper motor low input activating the wiper motor. The windshield wiper motor module continues to operate the windshield wiper motor in the same manner as in high speed, but in low speed with the wiper motor connected to the low speed input.
Intermittent Speed Windshield Wipers
The intermittent wiper speed is activated with grounds controlled by the multifunction switch inputs to the windshield wiper motor module. The windshield wiper motor module then activates the windshield wiper run/park relay coil and switches voltage through the windshield wiper high/low relay. The high/low relay remains deactivated, supplying the voltage to the wiper motor low speed input and activates the windshield wiper motor. When the windshield wiper motor module receives the grounded input, the motor continues to operate until Hall effect sensors senses the wiper motors magnet, which turns off the run/park sensor output to the windshield wiper run/park software, deactivating the relay and disconnecting voltage to the wiper motor. The windshield wipers remain parked until the windshield wiper motor module completes a time-out and then repeats the intermittent windshield wiper cycle.
Washer System
The windshield washer is activated by the internal wiper motor module when it receives a ground from the multifunction switch between the washer input. Dependent on the correct ground, the internal wiper motor modules activates the windshield washer relay (internal) by grounding the respective relay coil. When the relay is activated, it connects voltage to the washer pump while the washer level switch provides ground to the washer pump.
Default Mode
The windshield wiper motor defaults to this mode when the run/park sensor does not sense the hall effect magnet inside wiper motor. This can be caused by obstruction of the windshield wipers or a binding linkage. The windshield wiper motor will continue to operate in a high/low speed condition for a period of 60 seconds.

Symptom Chart
Symptom Chart Condition Possible Sources Action

• The wipers are inoperative

• Multifunction switch
• Circuitry
• Ignition switch
• Windshield wiper motor

• Go To Pinpoint Test A .

Do you know how to test automotive electrical circuits using a factory diagnostic test procedure flow chart ?

PINPOINT TEST A: THE WIPERS ARE INOPERATIVE Test Step Result / Action to Take A1 CHECK CIRCUITS 65 (DG) AND 2025 (RD/YE) FOR VOLTAGE

• Key in OFF position.
• Disconnect: Windshield Wiper Motor C125.
• Key in ON position.
• Measure the voltage between windshield wiper C125 pin 5, circuit 2025 (RD/YE), harness side and ground; and between windshield wiper motor C125 pin 8, circuit 65 (DG), harness side and ground.
• Are the voltages greater than 10 volts?

Yes
GO to A2 .

No
REPAIR the circuit(s) in question. TEST the system for normal operation. A2 CHECK CIRCUITS 57 (BK) AND 676 (PK/OG) FOR OPENS

• Key in OFF position.
• Measure the resistance between windshield wiper C125 pin 6, circuit 57 (BK), harness side and ground; and between windshield wiper motor C125 pin 3, circuit 676 (PK/OG), harness side and ground.
• Are the resistances less than 5 ohms?

Yes
GO to A3 .

No
REPAIR the circuit(s) in question. TEST the system for normal operation. A3 CHECK THE MULTIFUNCTION SWITCH

• Disconnect: Multifunction Switch C202b.
• Carry out the multifunction switch component test. Refer to Wiring Diagrams Cell 149 for schematic and connector information.
  
• Does the multifunction switch pass the component test?

Yes
GO to A4 .

No
INSTALL a new multifunction switch. REFER to Section 211-05 . A4 CHECK CIRCUIT 57 (BK) FOR AN OPEN

• Measure the resistance between C202b pin 5, circuit 57 (BK), harness side and ground.
• Is the resistance less than 5 ohms?

Yes
GO to A5 .

No
REPAIR the circuit. TEST the system for normal operation. A5 CHECK CIRCUITS 56 (DB/OG), 58 (WH), 61 (YE/RD), AND 63 (RD) FOR OPENS

• Using the following table, measure the resistance between the multifunction switch C202b harness side and the windshield wiper motor C125 harness side:
  
  Multifunction Switch C202b Windshield Wiper Motor C125 pin 6, circuit 56 (DB/OG) pin 10, circuit 56 (DB/OG) pin 3, circuit 58 (WH) pin 11, circuit 58 (WH) pin 1, circuit 61 (YE/RD) pin 1, circuit 61 (YE/RD) pin 4, circuit 63 (RD) pin 9, circuit 63 (RD)
• Are the resistances less than 5 ohms?

Yes
GO to A6 .

No
REPAIR the circuit(s) in question. TEST the system for normal operation. A6 CHECK FOR CORRECT WIPER MOTOR OPERATION

• Disconnect all wiper motor connectors.
• Check for:
  • corrosion
  • pushed-out pins
• Connect all wiper motor connectors and make sure they seat correctly.
• Operate the system and verify the concern is still present.
• Is the concern still present?

Yes
GO to A7 .

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation. A7 CHECK THE WINDSHIELD WIPER MOTOR

• Key in OFF position.
• Disconnect: Windshield Wiper Motor C125.
• Carry out the windshield wiper motor component test as outlined in this section.
• Does the windshield wiper motor pass the component test?

Yes
The system is operating correctly at this time. The concern may have been caused by binding or incorrect pivot arm adjustment. REFER to Windshield Wiper Blade and Pivot Arm Adjustment in this section. TEST the system for normal operation.

No
INSTALL a new windshield wiper motor. REFER to Windshield Wiper Motor in this section.

The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Body control module (BCM)
• Wiper micro relay
• Wiper 2 relay
• Wiper diode
• Windshield wiper motor
• Windshield washer pump
• Windshield washer nozzles
• Windshield washer solvent container
• Windshield wiper arm and blade assemblies
• Windshield wiper transmission
• WIP/WASH 10A fuse
• WIPER 25A fuse

Wiper/Washer System Description
The body control module (BCM) controls wiper motor low speed operation. The washer pump and high speed operation are controlled directly by the wiper/washer switch. The windshield wiper/washer switch supplies voltage on the signal circuits to the BCM for windshield wiper/washer operation. When WASH, MIST, DELAY, LOW, or HIGH is detected, the BCM energizes the wiper micro relay by suppling voltage to the relay coil. This allows battery voltage from the WIPER fuse to flow through the relay switched input then through the contacts and out the relay switched output to the wiper 2 relay switch contacts. Since the wiper 2 relay switch contacts are normally closed to the low speed circuit of the windshield wiper motor, the motor will operate at low speed.

Low Speed Operation
When the wiper switch is in the Low position, voltage is supplied through an internal resistor to the signal circuit. The body control module (BCM) monitors the windshield wiper switch signal 1 circuit, and energizes the wiper micro relay which will operate the windshield wiper motor. The wiper motor will operate at low speed, since the wiper 2 relay is de-energized. Low speed can also be commanded with a scan tool, by commanding Wiper Relay Cmd. ON and OFF. Refer to Scan Tool Output Controls .
High Speed Operation
In the High position, the windshield wiper/washer switch supplies voltage to both the wiper micro relay and wiper 2 relay coils. This energizes both relays and allows battery voltage from the wiper micro relay switched output to the switched input of the wiper 2 relay through its contacts and out the switched output of the wiper 2 relay to the high speed circuit of the windshield wiper motor. The windshield wiper motor will operate at high speed. During high speed wiper motor operation the wiper switch signal circuit is at the low speed signal voltage, and the body control module (BCM) supplies redundant voltage to the wiper relay via the wiper diode.

This info is out of hummer factory service manual !

WPR fuse 25amp under hood fuse box .
Wiper/Washer System Components
The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Body control module (BCM)
• Wiper PCB relay
• Wiper high PCB relay
• Windshield wiper motor
• Windshield washer fluid pump
• Windshield washer fluid level switch
• WPR fuse 25 A
• WSW fuse 10 A
This is more then likely not a fuse issue !!!!!!!
Low Speed Operation
When the wiper switch is in the low speed position, ground is applied through the switch internal resistor and the wiper switch low signal circuit to the body control module (BCM). In response to this signal, the BCM energizes the WIPER PCB relay by applying battery voltage through the wiper relay control circuit to the coil side of the relay. This allows battery positive voltage from the WPR fuse to flow through the switch input side of the WIPER PCB relay and out to the switch input side of the WIPER HIGH PCB relay. Since the wiper high relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the windshield wiper motor, the motor will operate at low speed.
Wiper motor low speed operation and the wiper PCB relay can also be commanded ON/OFF by using a scan tool. Refer to Control Module References.
The PCB relays mentioned above are soldered right into the circuit board inside the fuse/relay block under the hood . There are alot of reasons for the wipers not to work ! The fuse could be blown but fuse's don't just blow for no good reason , short to ground , low resistance high current flow etc.... Intermittant !

Power and Grounds
With the ignition in the ON position, accessory voltage is supplied through the 25A WPR fuse to the WIPER PCB relay, the WIPER HIGH PCB relay and the WS WASH PCB relay that are all located in the underhood fuse block. Refer to Wiper/Washer Schematics.
G200 provides ground for the windshield wiper motor and the WIPER PCB relay. G100 provides ground for the windshield washer fluid pump and the windshield washer fluid level switch.

First you need a wiring diagram, free at http://www.bbbind.com/free_tsb.html Then you need a DVOM - digital volt ohm meter to test the circuit . Then if your not familiar with automotive electrical systems testing ,go on youtube an check out Electric Testing Techniques You Need to Know Also having a factory diagnostic trouble shooting chart would also be usefull . You could just start replacing parts , you mite get lucky . The wiper motor is a high fail part , so is the switch ..You could find the fuse is blown ! But fuse's don't usually blow without a reason . Short to ground , low resistance . ( high current flow) Also knowing how they work and what all is involved in making them work.
The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Windshield wiper motor module
• Windshield wiper motor
• Windshield washer pump motor
• FRT/WPR/WSHR 25A fuse

Wiper/Washer System Operation
The windshield wiper motor module is part of the windshield wiper motor cover and controls wiper motor operation. The windshield wiper motor is a 2 speed motor and is operated at low speed in all modes except HIGH. The accessory voltage supply circuit to the windshield wiper motor assembly is used to operate the wiper motor in all of the low speed modes. The accessory voltage supply circuit to the windshield wiper/washer switch is used to supply the windshield wiper switch signal circuits and the wiper motor high speed circuit.
When the wiper/washer switch is in the LOW position voltage is supplied through a 24K ohm resistor within the switch to the windshield wiper switch signal 2 circuit, and accessory voltage is supplied to the windshield wiper switch signal 1 circuit. The reduced voltage from the wiper switch signal 2 circuit and accessory voltage from the wiper switch signal 1 circuit causes the wiper motor module to close the wiper motor accessory voltage supply circuit to the wiper motor low speed terminal.
Windshield wiper/washer system MIST operation is identical to LOW operation except that the MIST switch is a press and release type. When the wiper switch is moved to the MIST position and released, low speed wiper motor operation is started and will continue until 1 cycle is complete. If the wiper switch is moved to the MIST position and held, the windshield wiper motor will operate in the LOW mode until the switch is released.

Don't the wipers work in any mode ?
1
Did you review the Wiper/Washer System description and operation and perform the necessary inspections?
YES - Go to Step 2
NO - Go to Symptoms - Wiper/Washer Systems
2
Turn ON the ignition , with the engine OFF.
Operate the windshield wiper/washer switch through all the switch positions.
Does the windshield wiper/washer system operate normally?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Turn OFF the ignition.
Disconnect the harness connector of the windshield wiper motor.
Turn the ignition ON, with the engine OFF.
Connect a test lamp from the accessory voltage circuit of the windshield wiper motor to a good ground.
Does the test lamp illuminate?
YES - Go to Step 4
NO - Go to Step 13
4
Connect a test lamp from the accessory voltage circuit to the ground circuit of the windshield wiper motor.
Does the test lamp illuminate?
YES - Go to Step 5
NO - Go to Step 14
5
Connect a test lamp from the signal 2 circuit of the windshield wiper switch to a good ground.
Press the windshield washer switch.
Does the test lamp illuminate?
YES - Go to Step 11
NO - Go to Step 6
Let me know if you make it this far and i will send rest of diagnostic's

If your not familiar with automotive electronics an module control of components , I suggest you take it to the dealer . They have the tools to diagnose this type problem !
The Wiper/Washer System consists of the following components:
?€¢
Windshield wiper/washer switch

?€¢
Body control module (BCM)

?€¢
Wiper PCB relay

?€¢
Wiper high PCB relay

?€¢
Windshield wiper motor

?€¢
Windshield washer fluid pump

?€¢
Windshield washer fluid level switch

?€¢
WPR fuse 25 A

?€¢
WSW fuse 10 A

Low Speed Operation
When the wiper switch is in the low speed position, ground is applied through the switch internal resistor and the wiper switch low signal circuit to the body control module (BCM). In response to this signal, the BCM energizes the WIPER PCB relay by applying battery voltage through the wiper relay control circuit to the coil side of the relay. This allows battery positive voltage from the WPR fuse to flow through the switch input side of the WIPER PCB relay and out to the switch input side of the WIPER HIGH PCB relay. Since the wiper high relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the windshield wiper motor, the motor will operate at low speed.
High Speed Operation When the wiper switch is in the high speed position, ground is applied through the windshield wiper switch high signal circuit to the body control module (BCM) indicating the wiper high speed request. In response to this signal, the BCM then energizes the wiper PCB relay, as stated above, and the wiper high PCB relay by applying ground through the control circuit to the coil side of the relay. With the wiper high relay energized and its switch contacts closed to the high speed control circuit of the wiper motor, the motor will operate at high speed.
Wiper motor high speed operation and the wiper high speed PCB relay can also be commanded ON/OFF by using a scan tool. Refer to Control Module References.
DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
DTC B3875 00: Wiper High Speed Relay Circuit
DTC B3922 00: Front Wiper Function Select Circuit
You could Have a switch problem , BCM problem ,PCB relay problem , the pcb relays are non serviceable an the whole under hood fuse box would need to be replaced . Malfunctioning motor bad ground some where etc.....

Intermittent Speed Windshield Wipers
The intermittent wiper speed is activated with grounds controlled by the multifunction switch inputs to the windshield wiper motor module. The windshield wiper motor module then activates the windshield wiper RUN/PARK relay coil and switches voltage through the windshield wiper high/low relay. The high/low relay remains deactivated supplying the voltage to the wiper motor low speed input and activates the windshield wiper motor. When the windshield wiper motor module receives the grounded input, the motor continues to operate until Hall effect senses magnet to turn off RUN/PARK sense the output to the windshield wiper RUN/PARK software, deactivating the relay and disconnecting voltage to the wiper motor. The windshield wipers remain parked until the windshield wiper motor module completes a time-out and then repeats the intermittent windshield wiper cycle.

• The intermittent windshield wiper speed does not operate correctly

• Multifunction switch.
• Circuitry.
• Windshield wiper motor.

• Go To Pinpoint Test D .

Pinpoint Test D: The Intermittent Windshield Wiper Speed Does Not Operate Correctly
Normal Operation During normal operation, the windshield wiper motor receives voltage at all times through battery junction box (BJB) fuse 1 (30A), circuit 65 (DG). The windshield wiper motor also receives power with the ignition switch in RUN or ACC positions through central junction box (CJB) fuse 33 (15A), circuit 1002 (BK/PK). Ground is provided to the windshield wiper motor through circuit 676 (PK/OG) and circuit 57 (BK). The run/park and high/low relays are contained in the wiper motor electronics. Mode of operation is dependant on the signal(s) received from the multifunction switch.

Possible Causes
• Multifunction switch
• Open in circuit 57 (BK), 56 (DB/OG), 61 (YE/RD) or 63 (RD)
• Windshield wiper motor

PINPOINT TEST D: THE INTERMITTENT WINDSHIELD WIPER SPEED DOES NOT OPERATE CORRECTLY Test Step Result / Action to Take D1 CHECK THE MULTIFUNCTION SWITCH

• Key in OFF position.
• Disconnect: Multifunction Switch C202b.
• Carry out the multifunction switch component test. Refer to Wiring Diagrams Cell 149 for schematic and connector information.
  
• Did the multifunction switch pass the component test?

Yes
GO to D2 .

No
INSTALL a new multifunction switch. REFER to Section 211-05 . TEST the system for normal operation. D2 CHECK CIRCUIT 57 (BK) FOR OPEN

• Measure the resistance between multifunction switch C202b-6, circuit 57 (BK), harness side and ground.
• Is the resistance less than 5 ohms?

Yes
GO to D3 .

No
REPAIR the circuit. TEST the system for normal operation. D3 CHECK CIRCUITS 56 (DB/OG), 61 (YE/RD) AND 63 (RD) FOR OPENS

• Disconnect: Windshield Wiper Motor C125.
• Using the following table, measure the resistance between multifunction switch C202b harness side and windshield wiper motor C125 harness side:
  
  Multifunction Switch C202b Windshield Wiper Motor C125 Pin 2, circuit 56 (DB/OG) Pin 10, circuit 56 (DB/OG) Pin 4, circuit 61 (YE/RD) Pin 1, circuit 61 (YE/RD) Pin 1, circuit 63 (RD) Pin 9, circuit 63 (RD) Pin 3, circuit 58 (WH) Pin 11, circuit 58 (WH)
• Is the resistance less than 5 ohms?

Yes
GO to D4 .

No
REPAIR the circuit(s) in question. TEST the system for normal operation. D4 CHECK FOR CORRECT WIPER MOTOR OPERATION

• Disconnect all wiper motor connectors.
• Check for:
  • corrosion.
  • pushed-out pins.
• Connect all wiper motor connectors and make sure they seat correctly.
• Operate the system and verify the concern is still present.
• Is the concern still present?

Yes
GO to D5 .

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. TEST the system for normal operation. D5 CHECK THE WINDSHIELD WIPER MOTOR

• Key in OFF position.
• Disconnect: Windshield Wiper Motor C125.
• Carry out the windshield wiper motor component test as outlined in this section.
• Did the windshield wiper motor pass the component test?

Yes
The system is operating correctly at this time. Concern may have been caused by incorrect binding pivot arm adjustment. REFER to Wiper Blade and Pivot Arm Adjustment in this section. TEST the system for normal operation.

No
INSTALL a new windshield wiper motor. REFER to Windshield Wiper Motor in this section.

usually its on the same as horn and radio/ Check those but beware there are 2 spots for fuses under the dash and in the engine compartment/ Please rate my response thank you very much