Testing
INTERMITTENT WIPER FUNCTIONWARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, SEE RESTRAINT SYSTEMS FOR STEERING WHEEL OR COLUMN REMOVAL PROCEDURES.
Body Control Module Location:
The intermittent wiper function is controlled by the Body Control Module (BCM), located in the passenger compartment behind the right side kick panel. If the Body Control Module is determined to be the problem, refer to Instrument Panels and Systems, for replacement procedures.
Whatever the problem, disconnect motor wire harness and clean the terminals. Connect harness and test motor.
Windshield Washer Diagnosis:
WINDSHIELD WASHERS
Whenever a windshield washer malfunction occurs, first verify that the windshield washer wire harness is properly connected to all connectors before starting normal diagnosis and repair procedures. Refer to Windshield Washer Diagnosis Chart.
WINDSHIELD WIPER SYSTEM CONDITIONS
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.
Motor Will Not Run In Any Switch Position
Junction Block:
Power Distribution Center:
1. Check fuse 10, in the Junction Block and fuse C in the Power Distribution Center.
a. If fuse(s) are good, 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:
Ammeter Test:
3. Check the wiper motor low speed. Using two jumper wires, connect one jumper wire between the battery positive jump start terminal and Pin 3 on the wiper motor connector. Connect the other jumper wire to ground and Pin 4 on the wiper motor connector. Check the wiper motor high speed, connect the positive jumper wire to Pin 2 on the wiper motor connector. Connect the negative jumper wire to Pin 4 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 Step 4.
4. Using an ohmmeter, check for good ground at Pin 4 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 D of the intermittent wiper relay in the Power Distribution Center. If no voltage check fuse C. If OK, go to Step 6. If not OK, repair as necessary.
6. Using an ohmmeter, check from terminal D of the HI-LO wiper relay to Pin 2 of the motor wire connector for continuity Check from terminal E of the HI-LO wiper relay to Pin 3 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 B of the HI- LO wiper relay to terminal E of the intermittent wiper relay If OK, check for faulty relays and go to Step 8. If not repair as necessary
Body Control Module Connectors:
8. Disconnect the J3 24-way (bone/yellow) connector from the ECM.
9. Using an ohmmeter, check for continuity from terminal 1 of the BCM J3 24-way connector to the terminal C of the intermittent wiper relay If OK, go to Step 10. If not repair as necessary
10. Using a voltmeter, connect positive lead to terminal 16 of the BCM J3 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 2.
b. Using an ohmmeter, check for continuity from terminal 1 of wiper switch connector to terminal 16 of the BCM J3 24-way connector. If no continuity, repair circuit. If OK, go to Step 11.
c. Using a voltmeter, connect positive lead to terminal 3 of the wiper switch connector. If ignition voltage is present, replace the wiper switch. If no voltage, check continuity from fuse 10 to terminal 3 of the wiper switch connector. Repair circuit as necessary
11. Disconnect motor connector and replace fuse 10 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 4 on the wiper motor connector. Connect battery positive wire to Pin 3 on the wiper motor connector. When replacing drive link nut tighten to 11 to 12 N.m (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 3 on the wiper motor connector. Connect a second jumper wire between ground and Pin 4 on the wiper motor wire harness 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 terminal and Pin 2. Connect a second jumper wire between ground and Pin 4 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 E of the HI-LO wiper relay to Pin 3 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 D of the HI-LO wiper relay and Pin 2 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 3 on the wiper motor connector. Connect the second lead between ground and Pin 4 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 24-way connector from the BCM and remove the intermittent wiper relay.
5. Using an ohmmeter, check terminal 8 of the J3 24-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 18 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.
1. Check wiper motor wiring harness for shorts between the low speed motor feed terminal 3 or high speed motor feed terminal 2 and battery or ignition.
2. Check for faulty wiper intermittent or Hi/Lo relay.
3. Check circuit from intermittent relay terminal C to Hi/Low relay terminal B for short to battery or ignition.
4. Disconnect the J3 24-way connector from the BCM. Check circuit from terminal 1 of J3 24-way connector to terminal C of the intermittent wiper relay for short to ground.
5. Check circuit from terminal 2 of J3 2-way connector to Pin 1 of the wiper motor harness connector for a short to ground.
6. Using a voltmeter, connect positive lead to terminal 16 of the J3 24-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 10 of the J3 24-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 1 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 1 and Pin 4 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 BCM J3 2-way connector. Check for continuity between Pin 1 of the wiper motor wire harness connector and terminal 2 of the BCM J3 24-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 J3 24-way connector from the BCM.
2. Using a voltmeter, connect positive lead to terminal 10 of the J3 24-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 and repair as necessary.
b. If the battery voltage is shown, replace the BCM.