WIPER MOTOR TEST
CONDITION POSSIBLE CAUSE CORRECTION
WIPER OPERATES IN LOW
SPEED OR INTERMITTENT
ONLY
1. HI / LO RELAY
DEFECTIVE.
2. OPEN OR DEFECTIVE
CONTROL CIRCUIT IN
BCM.
3. DEFECTIVE WIPER
SWITCH.
4. OPEN HIGH SPEED
CIRCUIT.
5. DEFECTIVE MOTOR.
1. CHECK HI / LO RELAY WITH KNOWN GOOD
RELAY. IF NOT OK, REPLACE HI / LO RELAY.
2. OPEN OR DEFECTIVE CIRCUIT BETWEEN
HI / LO RELAY CAVITY “C9 AND BCM
CONNECTOR TERMINAL #12C. DEFECTIVE
BCM. IF NOT OK, REPAIR CIRCUIT OR REFER
TO BCM DIAGNOSTIC PROCEDURES.
3. REFER TO WIPER SWITCH DIAGNOSTIC
PROCEDURES.
4. OPEN OR DEFECTIVE CIRCUIT BETWEEN
HI / LO RELAY CAVITY “D9 AND WIPER
MOTOR CONNECTOR TERMINAL #1. IF NOT
OK, REPAIR CIRCUIT.
5. APPLY BATTERY JUMPER OVER TO WIPER
TERMINAL #1 AND GROUND TERMINAL #5. IF
NOT OK, REPLACE MOTOR.
WIPER OPERATES IN
INTERMITTENT MODE
ONLY
1. DEFECTIVE WIPER
SWITCH.
1. REFER TO WIPER SWITCH DIAGNOSTIC
PROCEDURES.
WIPER OPERATES IN HIGH
SPEED ONLY
1. DEFECTIVE HI / LO
RELAY.
2. DEFECTIVE CONTROL
CIRCUIT TO BCM.
3. DEFECTIVE BCM.
4. OPEN LOW SPEED
CIRCUIT.
5. DEFECTIVE MOTOR.
1. CHECK WIPER HI / LO RELAY WITH
KNOWN GOOD RELAY. REPLACE IF NOT OK.
2. CONTINUOUS SHORT BETWEEN HI / LO
RELAY CAVITY “C” AND BCM CONNECTOR
TERMINAL #12C. IF NOT OK, REPAIR CIRCUIT.
3. REFER TO BCM DIAGNOSTIC
PROCEDURES.
4. OPEN OR DEFECTIVE CIRCUIT BETWEEN
HI / LO RELAY CAVITY “E9 AND WIPER MOTOR
CONNECTOR TERMINAL #2. IF NOT OK,
REPAIR CIRCUIT.
5. APPLY BATTERY JUMPER POWER TO
WIPER TERMINAL #2 AND GROUND
TERMINAL #5. IF NOT OK, REPLACE MOTOR.
WIPER OPERATION
SWITCHES BETWEEN LOW
AND HIGH SPEED
OPERATION
1. DEFECTIVE CONTROL
CIRCUIT TO BCM.
2. DEFECTIVE BCM.
1. INTERMITTENT SHORT BETWEEN HI / LO
RELAY CAVITY “C” AND BCM CONNECTOR
TERMINAL #12C, IF NOT OK, REPAIR CIRCUIT.
2. REFER TO BCM DIAGNOSTIC
PROCEDURES.
LH WIPER AND WASHER SYSTEMS 8K - 9
DIAGNOSIS AND TESTING (Continued)
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