Symptom Diagnostic Procedures

The following is a list of general wiper motor system problems and tests that are to be performed to locate the faulty part, and the corrective action to be taken. When installing harness connector to motor connector on vehicle, assure motor terminals are not bent causing an open circuit to motor.

Motor Will Not Run In Any Switch Posits On
1. Check fuse 5, in the Junction Block and fuse M in the Power Distribution Center and.
a. If fuse(s) are good go to Step 3.
b. If fuse(s) are defective replace, and check motor operation in all switch positions.
c. If motor is still inoperative and the fuse does not blow, go to Step 3.
d. If replacement fuse blows, go to Step 12.
2. Disconnect motor wire harness connector.
3. Check the wiper motor low speed. Using two jumper wires, connect one jumper wire between the battery positive jump start terminal and Pin 2 on the wiper motor connector. Connect the other jumper wire to ground and Pin 5 on the wiper motor connector. Check the wiper motor high speed, connect the positive jumper wire to Pin 1 on the wiper motor connector. Connect the negative jumper wire to Pin 5 on the wiper motor connector.
a. If motor runs, go to Step 5.
b. If motor does not run, high or low speed replace the wiper motor.
4. Using an ohmmeter, check for good ground at Pin 5 of the wiper motor wire harness connector. If not OK, repair the ground circuit as necessary. If OK, go to Step 6.
5. Place the wiper switch in the ON position. Using a voltmeter check for battery voltage at terminal D and A of the intermittent wiper relay in the Power Distribution Center. If no voltage check fuse M. If OK, go to Step 7.If not OK, repair as necessary
6. Using an ohmmeter, check from terminal D of the RI-LO wiper relay to Pin 1 of the motor wire connector for continuity. Check from terminal E of the HI-LO wiper relay to Pin 2 of the motor wire connector for continuity. If OK, go to Step 8.If not repair as necessary
7. Using an ohmmeter, check for continuity between the HI-LO wiper relay and the intermittent wiper relay Check from terminal B of the HI- LO wiper relay to terminal B of the intermittent wiper relay. If OK, check for faulty relays and go to Step 9.If not repair as necessary
8. Disconnect the C3 bone 12-way connector from the BCM.
9. Using an ohmmeter, check for continuity from terminal 4 of the BCM C3 24-way black connector to the terminal C of the intermittent wiper relay. If OK, go to Step 11.If not repair as necessary.
10. Using a voltmeter, connect positive lead to terminal 8 of the BCM C2 black 24-way connector and negative lead to ground. Turn ignition switch to the ON position. Slowly move the wiper switch from OFF position through each position to HIGH.
a. If voltage increases from zero to approximately 10 volts in the HIGH position, replace BCM. If no voltage, go to Step
b. Using an ohmmeter, check for continuity from terminal :3 of wiper switch connector to terminal 8 of the BCM C2 black 24-way connector. If no continuity, repair circuit. If OK, go to Step
c. Using a voltmeter, connect positive lead to terminal 1 of the wiper switch connector. If ignition voltage is present, replace the wiper switch. If no voltage, check continuity from fuse 5 to terminal 1 of the wiper switch connector. Repair circuit as necessary.
11. Disconnect motor connector and replace fuse 5 from the Junction Block.
a. If fuse does not blow, go to Step 3.
b. If fuse blows, wiper control circuit is at fault, repair as necessary.

Motor Runs Slowly At All Speeds
1. Disconnect the wire harness from the wiper motor. Remove wiper arms and blades. Disconnect motor drive link from motor. Connect an ammeter between battery negative jump start terminal and Pin 5 on the wiper motor connector. Connect battery positive wire to Pin 2 on the wiper motor connector. When replacing motor crank nut tighten to 15-20 N.m (130-177 in. lbs.) torque.
a. If average ammeter reading is more than 10 amps with a hot motor and dry windshield, replace motor.
b. If motor runs and average ammeter reading is less than 10 amps, go to Step 3.
2. Check to see if wiper linkage or pivots are binding or caught.

Motor Will Run At High Speed, But Not Move At Low Speed. Motor Will Run At Low Speed, But Will Not Move At High Speed
1. Disconnect motor connector.
2. If motor will not run on low speed, connect a jumper wire between battery positive jump start terminal and Pin 2 on the wiper motor connector. Connect a second jumper wire between ground and Pin 5 on the wiper motor wire harness connector.
a. If motor runs, go to Step 4.
b. If motor does not run, replace the motor.
3. If motor will not run on high speed, connect a jumper wire between battery positive terminal and Pin 1.Connect a second juniper wire between ground and Pin 5 of the motor connector.
a. If motor runs, go to Step 5.
b. If motor does not run, replace the motor.
4. If wipers will not run at low speed, using an ohmmeter, check for open circuit. Check between terminal E of the HI-LO wiper relay to Pin 2 of the wiper motor wire harness connector for continuity. If OK, go to Step 6.If not repair circuit as necessary
5. If wiper will not run at the high speed. using an ohmmeter, check for an open circuit. Check between terminal D of the HI-LO wiper relay and Pin 2 of the wiper motor wire harness connector for continuity If OK, go to Step 7.If not repair circuit as necessary
6. Check for faulty HI-LO wiper relay

Wipers Run At High Speed With Switch In Low Speed Position. Wipers Operate In Intermittent Mode, But Each Wipe Is At High Speed.
1. Disconnect motor connector.
2. Using two jumper wires, connect one between the battery positive jump start terminal and Pin 2 on the wiper motor connector. Connect the second lead between ground and Pin 5 on the wiper motor connector. If motor runs at low speed, go to Step 4.If motor runs at high speed, replace the motor.
3. Check for faulty HI-LO wiper relay Check for crossed wires in harness from HI-LO relay to motor.
4. Disconnect C3 bone 12-way connector from the BCM and remove the HI/LO wiper relay
5. Using an ohmmeter, check terminal 12 of the C3 bone 12-way connector for short to ground.
6. If continuity to ground is present, repair as necessary If no continuity to ground, replace the BCM.

Wipers Run At Low Speed With Switch In High Speed Position
1. Check for faulty HI-LO wiper relay
2. Using an ohmmeter, check for open circuit between terminal C of the HI-LO wiper relay and terminal 12 of the BCM 33 bone 12-way connector. If OK, go to Step 4.If not OK, repair as necessary
3. Check wiper switch.
4. Check for binding linkage
5. Refer to MOTOR RUNS SLOWLY AT ALL SPEEDS.

Motor Will Keep Running With Switch In Off Position.
1. Check wiper motor wiring harness for shorts between the low speed motor feed terminal 2 or high speed motor feed terminal 1 and battery or ignition.
2. Check for faulty wiper ON/OFF or HI/LO relay.
3. Check circuit from ON/OFF relay terminal C to HI/LO relay terminal B for short to battery or ignition.
4. Disconnect the C3 bone 12-way connector from the BCM. Check circuit from terminal 4 of C3 bone 12-way connector to terminal C of the ON/OFF wiper relay for short to ground.
5. Check circuit from terminal 3 of C3 bone 12-way connector to Pin 4 of the wiper motor harness connector for an open. If open circuit, repair as necessary.
6. Using a voltmeter, connect positive lead to terminal 8 of the C3 black 12-way connector. Connect negative lead to ground. If voltmeter reads greater than 0 volts, check wiper switch and wiring.
7. Using a voltmeter, connect positive lead to terminal 8 of the C3 black 12-way connector.
a. If voltmeter reads 10 to 15 volts, check the circuit for short to battery or ignition.
b. If the voltmeter reads 0 volts, replace the BCM.

Wiper Will Run Continuously With Switch In The Intermittent Position. When Column Switch Is Turned Off, Wipers Stop Wherever They Are, Without Returning To Park Position.
1. Using an ohmmeter, check for ground at Pin 4 on the wiper motor connector. If grounded, replace motor.
2. Using an ohmmeter, with the wiper motor in the PARK position, check for continuity between Pin 5 and Pin 4 on the wiper motor connector. If continuous continuity, go to Step 4.If not OK, replace motor.
3. Disconnect the wiper motor wire harness connector and the BCM C3 bone 12-way connector. Check for continuity between Pin 1 - of the wiper motor wire harness connector and terminal 3 of the BCM C3 bone 12-way connector. If no continuity, repair as necessary. If continuity is OK, test the wiper motor

Wipers Do Not Run When Washer Motor Is Engaged
1. Disconnect the C2 black 12-way connector from the BCM.
2. Using a voltmeter, connect positive lead to terminal 7 of the C2 black 12-way connector and the negative lead to ground.
3. Engage the washer switch so that the washer motor runs continuously.
a. If the voltage is zero, check the wiring between the washer switch terminal 2 and the BCM and repair as necessary.
b. If the battery voltage is shown, replace the BCM.