Component Tests and General Diagnostics

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. These tests will cover both two speed and intermittent wiper functions.

Actuation of the wiper relays can be performed using ACTUATOR TESTS on the DRB III. Status of the wiper park switch can also be monitored.

Motor Will Not Run In Any Switch Position.

Junction Block:

Power Distribution Center (PDC):

1. Check fuse 15, in the Junction Block and fuse 8 and 18 in the Power Distribution Center.
a. If fuse(s) are OK, go to Step 2.
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 2.
d. If replacement fuse blows, go to Step 11.
2. Disconnect motor wire harness connector.

Motor Wire 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 B on the wiper motor connector. Connect the other jumper wire to ground and Pin C on the wiper motor connector. Check the wiper motor high speed, connect the positive jumper wire to Pin A on the wiper motor connector. Connect the negative jumper wire to Pin C on the wiper motor connector.
a. If motor runs, go to Step 4.
b. If motor does not run, high or low speed replace the wiper motor.
4. Using a ohmmeter; check for good ground at Pin C of the wiper motor wire harness connector. If OK, replace motor. If not repair the ground circuit as necessary
5. The wiper switch in the ON position. Using an voltmeter, check for battery voltage at terminal 29 of the intermittent wiper relay in the Power Distribution Center. If no voltage check fuse 18. If OK, go to Step 6. If not repair as necessary.
6. Using an ohmmeter, check from terminal 28 of the HI-LO wiper relay to Pin A of the motor wire connector for continuity. Check from terminal 11 of the HI-LO wiper relay to Pin B of the motor wire connector for continuity. If OK, go to Step 7. 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 36 of the HI- LO wiper relay to terminal 37 of the intermittent wiper relay. If OK, check for faulty relays. If not repair as necessary.

Body Control Module 14-Way Connector:

8. Disconnect the J3 14-way connector from the BCM.
9. Using an ohmmeter, check for continuity from terminal 7 of the J3 14-way connector to the terminal 15 of the intermittent wiper relay. If OK, go to Step 10. If not repair as necessary.

Body Control Module 22-Way Connector:

10. Using a voltmeter, connect positive lead to terminal 10 of the BCM J1 22-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.
b. Using an ohmmeter, check for continuity from terminal 2 of wiper switch connector to terminal 10 of the BCM J3 22-way connector. If no continuity, repair circuit. If OK, go to Step 11.
11. Disconnect motor connector and replace fuse 15 from the Junction Block.
a. If fuse does not blow, go to Step 2.
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 C on the wiper motor connector. Connect battery positive wire to Pin B on the wiper motor connector. When replacing drive link nut tighten to 11 to 12 Nm (98 to 106 in. lbs.) torque.
a. If average ammeter reading is more than 6 amps, replace motor.
b. If motor runs and average ammeter reading is less than 6 amps, go to Step 2.
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 B on the wiper motor connector. Connect a second jumper wire between ground and Pin C on the wiper motor connector.
a. If motor runs, go to Step 3.
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 remote cable terminal and Pin A. Connect a second jumper wire between ground and Pin C of the motor connector.
a. If motor runs, go to Step 4
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 11 of the HI-LO wiper relay to Pin B of the wiper motor wire harness connector for continuity. If OK, go to Step 5. If not repair as necessary.
5. If wiper will not run at the high speed, using an ohmmeter, check for an open circuit. Check between terminal 28 of the HI-LO wiper relay and Pin A of the wiper motor wire harness connector for continuity. If OK, go to Step 6. If not repair 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 B on the wiper motor connector. Connect the second lead between ground and Pin C on the wiper motor connector. If motor runs at low speed, go to Step 3. 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 J3 14-way connector from the BCM and remove the intermittent wiper relay.
5. Using an ohmmeter, check for short to ground Pin 8 of the J3 1way connector.
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 12 of the HI-LO wiper relay and terminal 8 of the BCM J3 14-way connector. If OK, go to Step 3. 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.
Using a ohmmeter, Check Pin 8 of the BCM J3 14-way connector for continuity to ground signal when the wipers are in the park position only
1. If no ground signal, test wiper motor.
2. If a ground is received test the multi-function switch.
3. If the multi-function switch test OK, 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 D 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 C and Pin D on the wiper motor connector. If continuous continuity, go to Step 3. If not OK, replace motor.
3. Disconnect the wiper motor wire harness connector and the J3 14-way connector. Check for continuity between Pin D of the wiper motor wire harness connector and terminal 2 of J3 14-way connector of the BCM. If no continuity, repair as necessary. If continuity is OK, test the wiper motor.

Wipers Do Not Run When Washer Motor Is Engaged.
1. Backprobe the J3 14-way connector from the BCM.
2. Using a voltmeter, connect positive lead to terminal 10 of the 14-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 motor and the BCM. Repair as necessary.
b. If the battery voltage, ensure that the 1way connector is disconnected and check Pin 10 if it has 12 volts. If no voltage replace the BCM. If battery voltage, test for a wiring short.

NOTE: Make sure to test the multi-function switch before replacing the BCM.

Wipers Operate In Intermittent Settings But Does Not Have Six Different Speeds.
To test the multi-function windshield wiper switch, refer to Turn Signals and Hazard Warning Flashers, for diagnosis and testing of the Multi-Function Switch.