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 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.
Washer System
The windshield washer is activated by the internal wiper motor module when it receives a ground signal input from the multifunction switch. Dependent on the switch selection, the internal wiper motor module 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.
Visual Inspection Chart
Mechanical
Electrical
- Windshield washer hoses
- Wiper linkage
- Multifunction switch
- Battery junction box (BJB) fuse 110 (30A)
- Central junction box (CJB) fuse 13 (10A)
- Circuitry
- Windshield wiper motor
Symptom Chart
Condition
Possible Sources
Action
- The wipers are inoperative
- Fuse(s)
- Circuitry
- Multifunction switch
- Windshield wiper motor
- The wipers stay on continuously
- Circuitry
- Multifunction switch
- Windshield wiper motor
- The high/low wiper speeds do not operate correctly (intermittent wiper mode OK)
- Circuitry
- Multifunction switch
- Windshield wiper motor
- The intermittent windshield wiper speed does not operate correctly (high/low speeds OK)
- Circuitry
- Multifunction switch
- Windshield wiper motor
- The wipers will not park at correct position
- Pivot arm adjustment
- Linkage
- Windshield wiper motor
- REFER to Windshield Wiper Blade and Pivot Arm Adjustment in this section.
- The washer pump is inoperative
- Circuitry
- Windshield washer pump
- Multifunction switch
- Windshield wiper motor
Do you know how to do electrical testing ?
windshield wiper motor
PINPOINT TEST C: THE HIGH/LOW WIPER SPEEDS DO NOT OPERATE CORRECTLY (INTERMITTENT WIPER MODE OK)
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
Test Step
Result / Action to Take
C1 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.
- Does the multifunction switch pass the component test?
Yes
GO to C2 .
No
INSTALL a new multifunction switch. REFER to Section 211-05 .
C2 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Measure the resistance between the multifunction switch C202b-5, circuit 57 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to C3 .
No
REPAIR the circuit. TEST the system for normal operation.
C3 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 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 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 C4 .
No
REPAIR the circuit. TEST the system for normal operation.
C4 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 C5 .
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.
C5 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.