Symptom Related Diagnostic Procedures

WIPER FAILS TO OPERATE

1. Binding linkage.
2. Faulty instrument panel switch.
3. Linkage disconnected.
4. Faulty motor.
5. Open or grounded wiring.
6. Motor not grounded.
7. Faulty circuit breaker.
8. Jammed or faulty gear box mechanism.
9. Motor overheated.

MOTOR RUNS BUT OUTPUT CRANK DOES NOT TURN

1. Stripped intermediate gear.
2. Stripped output gear.
3. Output gear slips on output shaft.
4. Crank not fastened properly to output gear shaft.

BLADES STOP AGAINST WINDSHIELD MOLDINGS

1. Improperly adjusted wiper arm.
2. Looseness of the motor crank or other drive parts.

BLADES CHATTER

1. Twisted arm holds blade at wrong angle to glass.
2. Bent or damaged blades.
3. Foreign substances such as body polish on glass.

NO SPEED CONTROL (MOTOR RUNS AT ONE SPEED ONLY)

1. Open circuit in red or brown wiring.
2. Defective control switch.
3. Low speed torque limiting resistor open.

MOTOR WILL NOT STOP WHEN INSTRUMENT PANEL SWITCH IS TURNED "OFF"

1. Broken island on gear.
2. Defective armature brake switch.
3. Defective motor park switch.

MOTOR STOPS IN ANY POSITION WHEN INSTRUMENT PANEL SWITCH IS TURNED "OFF"

1. Motor park switch defective.
2. Open parking circuit.
3. Open field circuit.

WIPER BLADES NOT PARKING PROPERLY

1. Arm set at incorrect position.
2. Broken crank mechanism.
3. Defective motor park switch.

MOTOR OVERHEATS

1. Binding linkage.
2. Motor drawing excessive current.

WIPER KNOCKS AT EXTREME WIPE

1. Excessive armature endplay.
2. Axial or worn out freeplay in linkage.