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.
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:
- 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.
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