DIAGNOSIS AND TESTING
- FRONT WASHER PUMP INOPERATIVE
- FRONT WIPER LOW SPEED INOPERATIVE
- WIPER HIGH/LOW RELAY OUTPUT CIRCUIT HIGH
- WIPER HIGH/LOW RELAY OUTPUT CIRCUIT LOW
- WIPER MODE SWITCH CIRCUIT HIGH
- WIPER MODE SWITCH CIRCUIT LOW
- WIPER ON/OFF RELAY OUTPUT CIRCUIT HIGH
- WIPER ON/OFF RELAY OUTPUT CIRCUIT LOW
- WIPER PARK SWITCH FAILURE
FRONT WASHER PUMP INOPERATIVE
For a complete wiring diagram Refer to Section 8W
- When Monitored:
Possible Causes
- Set Condition:
Possible Causes
| Possible Causes |
| FRONT WASHER PUMP |
| FRONT WASHER PUMP GROUND CIRCUIT OPEN |
| MULTIFUNCTION SWITCH |
| FRONT WASHER PUMP SENSE CIRCUIT OPEN |
| FRONT WASHER PUMP DRIVER CIRCUIT OPEN |
| FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN |
| BODY CONTROL MODULE |
Diagnostic Test
Turn the ignition off.
Disconnect the Front Washer Pump harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Front Washer Pump Driver circuit.
Actuate the Front Washers.
Does the test light illuminate brightly?
Yes
- Replace the Front Washer Pump.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To2
2. FRONT WASHER PUMP GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Front Washer Pump.
Using a 12-volt test light connected to 12-volts, check the Front Washer Pump Ground circuit.
Does the test light illuminate brightly?
Yes
- Go To3
No
- Repair the Front Washer Pump Ground Circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.
3. MULTIFUNCTION SWITCH
Turn the ignition off.
Disconnect the right side Multifunction Switch C2 harness connector.
Connect a jumper wire between the Fused Ignition Switch Output circuit and the Front Washer Pump Driver circuit in the Multifunction Switch harness connector.
Turn the ignition on.
Does the Front Washer Pump operate?
Yes
- Replace the Multifunction Switch.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To4
4. FRONT WASHER PUMP SENSE CIRCUIT OPEN
Turn the ignition off.
Disconnect the right side Multifunction Switch.
Disconnect the Body Control Module.
Measure the resistance of the Front Washer Pump Sense circuit.
Is the resistance above 5.0 ohms?
Yes
- Repair the Front Washer Pump Sense Circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To5
5. FRONT WASHER PUMP DRIVER CIRCUIT OPEN
Turn the ignition off.
Disconnect the Front Washer Pump.
Disconnect the Body Control Module from the Junction Block.
Measure the resistance of the Front Washer Pump Driver circuit.
Is the resistance above 5.0 ohms?
Yes
- Repair the Front Washer Pump Driver Circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To6
6. FUSED IGNITION SWITCH OUTPUT OPEN
Turn the ignition off.
Disconnect the Multifunction Switch.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch Output circuit.
Does the test light illuminate brightly?
Yes
- Repair the Fused Ignition Switch Output circuit for an open. If the fuse is open make sure to check for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1.
FRONT WIPER LOW SPEED INOPERATIVE
For a complete wiring diagram Refer to Section 8W
- When Monitored:
Possible Causes
- Set Condition:
Possible Causes
| Possible Causes |
| MULTIFUNCTION SWITCH |
| FRONT WIPER MOTOR GROUND CIRCUIT OPEN |
| FRONT WIPER MOTOR LOW DRIVER CIRCUIT OPEN |
| FRONT WIPER MOTOR |
| FUSED IGNITION SWITCH OUTPUT CIRCUIT |
Diagnostic Test
1. MULTIFUNCTION SWITCH
Turn the ignition off.
Disconnect the right side Multifunction Switch harness connector.
Connect a jumper wire between the Fused Ignition Switch Output circuit and the Front Wiper Motor Low Driver circuit in the Multifunction Switch harness connector.
Turn the ignition on.
Does the Front Wiper Motor function normally?
Yes
- Replace the Multifunction Switch.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To2
2. FRONT WIPER MOTOR GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Front Wiper Motor.
Using a 12-volt test light connected to 12-volts, check the Front Wiper Motor Ground circuit.
Does the test light illuminate brightly?
Yes
- Go To3
No
- Repair the Front Wiper Motor Ground Circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.
3. FRONT WIPER MOTOR LOW DRIVER CIRCUIT OPEN
Turn the ignition off.
Disconnect the Front Wiper Motor.
Disconnect the right side Multifunction Switch.
Measure the resistance of the Front Wiper Motor Low Driver circuit.
Is the resistance above 5.0 ohms?
Yes
- Repair the Front Wiper Motor Low Driver Circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To4
4. FRONT WIPER MOTOR
Turn the ignition off.
Disconnect the Front Wiper Motor harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Front Wiper Motor Low Driver circuit.
Turn the Front Wipers on to Low.
Does the test light illuminate brightly?
Yes
- Replace the Front Wiper Motor.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Repair the Fused B+ Output circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.
WIPER HIGH/LOW RELAY OUTPUT CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With ignition on.
- Set Condition:
BCM detects a high level on the Wiper High/Low relay output when it is attempting to turn the wipers on for more than 5 seconds.
| Possible Causes |
| MISSING RELAY |
| OPEN CIRCUIT BREAKER |
| WIPER HIGH/LOW RELAY |
| BODY CONTROL MODULE |
| FRONT WIPER PARK SWITCH SENSE CIRCUIT OPEN |
Diagnostic Test
1. INTERMITTENT CONDITIONTurn the ignition on.
With the scan tool, clear all BCM DTC's.
Turn the Front Wipers on.
With the scan tool, read the DTC information.
Does the scan tool read: WIPER HIGH/LOW RELAY CIRCUIT HIGH?
Yes
- Go To2
No
- The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
- Perform BODY VERIFICATION TEST - VER 1.
2. MISSING RELAY
Turn the ignition off.
Check the PDC to make certain the Wiper High/Low Relay is present.
Is the Wiper High/Low Relay present?
Yes
- Go To3
No
- Replace the missing Wiper High/Low Relay.
- Perform BODY VERIFICATION TEST - VER 1.
3. OPEN CIRCUIT BREAKER
Turn the ignition off.
Check the Junction Block Circuit Breaker 3.
Is the Circuit Breaker open?
Yes
- Replace the open Circuit Breaker.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To4
4. WIPER HIGH/LOW RELAY
Turn the ignition off.
Install a known good relay in place of the Wiper High/Low Relay.
Turn the Wipers On.
Do the Wipers operate normally?
Yes
- Replace the Wiper High/Low Relay.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To5
5. BODY CONTROL MODULE
Turn the ignition off
Remove the Wiper High/Low Relay.
Measure the voltage of the Fused B+ circuit of the Wiper High/Low Relay.
Is the voltage above 10 volts?
Yes
- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Repair the Front Wiper Park Switch Sense circuit for an open condition.
- Perform BODY VERIFICATION TEST - VER 1.
WIPER HIGH/LOW RELAY OUTPUT CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With ignition on.
- Set Condition:
BCM detects a low (ground) signal on the wiper on/off relay output even though it is not attempting to drive the output for more than 5 seconds.
| Possible Causes |
| WIPER HIGH/LOW RELAY SHORT TO GROUND |
| WIPER HIGH/LOW RELAY |
| BODY CONTROL MODULE |
Diagnostic Test
1. INTERMITTENT CONDITIONTurn the ignition on.
With the scan tool, clear all BCM DTC's.
Turn the Wipers on.
With the scan tool, read the DTC information.
Does the scan tool read: WIPER HIGH/LOW RELAY OUTPUT CIRCUIT LOW?
Yes
- Go To2
No
- The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
- Perform BODY VERIFICATION TEST - VER 1.
2. WIPER HIGH/LOW RELAY SHORT TO GROUND
Turn the ignition off.
Disconnect the Wiper High/Low Relay.
Measure the resistance between ground and the Wiper High/Low Relay Control circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the Wiper High/Low Relay Control circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To3
3. WIPER HIGH/LOW RELAY
Turn the ignition off.
Disconnect the Wiper High/Low Relay harness connector.
Measure the voltage of the Wiper High/Low Relay harness connector coil side feed circuit to ground.
Is the voltage above 10.0 volts?
Yes
- Replace the Wiper High/Low Relay.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1.
WIPER MODE SWITCH CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on.
- Set Condition:
BCM detects a voltage greater than 4.75 volts on the Wiper Mode Switch Input for more than 5 seconds.
| Possible Causes |
| MULTIFUNCTION SWITCH |
| FRONT WIPER SWITCH MUX CIRCUIT OPEN |
| BODY CONTROL MODULE |
Diagnostic Test
1. INTERMITTENT CONDITIONTurn the ignition on.
With the scan tool, erase all BCM DTC's.
Turn the Wipers on.
With the scan tool, read DTCs.
Does the scan tool display: WIPER MODE SWITCH CIRCUIT HIGH?
Yes
- Go To2
No
- The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
- Perform BODY VERIFICATION TEST - VER 1.
2. MULTIFUNCTION SWITCH
Turn the ignition off.
Disconnect the Multifunction Switch harness connector.
Connect a jumper wire between the Front Wiper Switch MUX circuit to ground.
Turn the ignition on.
With the DRBIII®, select Body, Body Controller and read: Wiper Switch volts.
Does the scan tool display: Multifunction Switch voltage below 0.5volts?
Yes
- Replace the Multifunction Switch.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To3
3. FRONT WIPER SWITCH MUX CIRCUIT OPEN
Turn the ignition off.
Disconnect the Body Control Module harness connector.
Disconnect the Multifunction Switch harness connector.
Measure resistance of the Front Wiper Switch MUX circuit from the Body Control Module connector to the Multifunction Switch harness connector.
Is the resistance above 5.0 ohms?
Yes
- Repair the Front Wiper Switch MUX circuit for an open condition.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1.
WIPER MODE SWITCH CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the igntion on.
- Set Condition:
BCM detects a voltage less than 0.25 volts on the Wiper Mode Switch Input for more than 5 seconds.
| Possible Causes |
| MULTIFUNCTION SWITCH SHORTED |
| FRONT WIPER SWITCH MUX CIRCUIT SHORT TO GROUND |
| BODY CONTROL MODULE |
Diagnostic Test
1. INTERMITTENT CONDITIONTurn the ignition on.
With the scan tool, clear all BCM DTC's.
Turn the Wipers on.
With the scan tool, read DTCs.
Does the scan tool display: WIPER MODE SWITCH CIRCUIT LOW?
Yes
- Go To2
No
- The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
- Perform BODY VERIFICATION TEST - VER 1.
2. MULTIFUNCTION SWITCH SHORTED
Turn the ignition off.
Disconnect the Multifunction Switch harness connector.
Turn the ignition on.
With the DRBIII®, select Body, Body Control Module and read: Multifunction Switch voltage..
Does the scan tool display: Multifunction Switch voltage above 4.75 volts?
Yes
- Replace the Multifunction Switch.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To3
3. FRONT WIPER SWITCH MUX CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Body Control Module harness connector.
Disconnect the Multifunction Switch harness connector.
Measure resistance between ground and the Front Wiper Switch MUX circuit.
Is the resistance above 5.0 ohms?
Yes
- Repair the Front Wiper Switch MUX Circuit for a short to ground condition.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1.
WIPER ON/OFF RELAY OUTPUT CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on.
- Set Condition:
BCM detects a high level on the Wiper On/Off Relay output when it is attempting to turn the wipers on for more than 5 seconds.
| Possible Causes |
| MISSING RELAY |
| OPEN CIRCUIT BREAKER |
| WIPER ON/OFF RELAY |
| BODY CONTROL MODULE |
| FRONT WIPER PARK SWITCH SENSE CIRCUIT OPEN |
Diagnostic Test
1. INTERMITTENT CONDITIONTurn the ignition on.
With the scan tool, clear all BCM DTC's.
Turn the Front Wipers on.
With the scan tool, read the DTC information.
Does the scan tool read: WIPER ON/OFF RELAY CIRCUIT HIGH?
Yes
- Go To2
No
- The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
- Perform BODY VERIFICATION TEST - VER 1.
2. MISSING RELAY
Turn the ignition off.
Check the PDC to make certain the Wiper On/Off Relay is present.
Is the Wiper On/Off Relay present?
Yes
- Go To3
No
- Replace the missing Wiper On/Off Relay.
- Perform BODY VERIFICATION TEST - VER 1.
3. OPEN CIRCUIT BREAKER
Turn the ignition off.
Check the Junction Block Circuit Breaker 3.
Is the Circuit Breaker open?
Yes
- Replace the open Circuit Breaker.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To4
4. WIPER ON/OFF RELAY
Turn the ignition off.
Install a known good relay in place of the Wiper On/Off Relay.
Turn the Wipers On.
Do the Wipers operate normally?
Yes
- Replace the Wiper On/Off Relay.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To5
5. BODY CONTROL MODULE
Turn the ignition off
Remove the Wiper On/Off Relay.
Measure the voltage of the Fused B+ circuit of the Wiper On/Off Relay.
Is the voltage above 10 volts?
Yes
- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Repair the Front Wiper Park Switch Sense circuit for an open condition.
- Perform BODY VERIFICATION TEST - VER 1.
WIPER ON/OFF RELAY OUTPUT CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on.
- Set Condition:
BCM detects a low (ground) signal on the Wiper On/Off Relay output even though it is not attempting to drive the output for more than 5 seconds.
| Possible Causes |
| WIPER ON/OFF RELAY SHORT TO GROUND |
| WIPER ON/OFF RELAY |
| BODY CONTROL MODULE |
Diagnostic Test
1. INTERMITTENT CONDITIONTurn the ignition on.
With the scan tool, clear all BCM DTC's.
Turn the Wipers on.
With the scan tool, read the DTC information.
Does the scan tool read: WIPER ON/OFF RELAY OUTPUT CIRCUIT LOW?
Yes
- Go To2
No
- The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
- Perform BODY VERIFICATION TEST - VER 1.
2. WIPER ON/OFF RELAY SHORT TO GROUND
Turn the ignition off.
Disconnect the Wiper On/Off Relay.
Measure the resistance between ground and the Wiper On/Off Relay Control circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the Wiper On/Off Relay Control circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To3
3. WIPER ON/OFF RELAY
Turn the ignition off.
Disconnect the Wiper On/Off Relay harness connector.
Measure the voltage of the Wiper On/Off Relay harness connector coil side feed circuit to ground.
Is the voltage above 10.0 volts?
Yes
- Replace the Wiper On/Off Relay.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1.
WIPER PARK SWITCH FAILURE
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the Wipers on (any speed).
- Set Condition:
BCM fails to detect a park signal from the wiper motor for 8 consecutive seconds.
| Possible Causes |
| MULTIFUNCTION SWITCH |
| FRONT WIPER MOTOR GROUND CIRCUIT OPEN |
| FRONT WIPER MOTOR LOW DRIVER CIRCUIT OPEN |
| FRONT WIPER MOTOR |
| FUSED IGNITION SWITCH OUTPUT CIRCUIT |
Diagnostic Test
1. INTERMITTENT CONDITIONTurn the ignition on.
With the scan tool, erase all BCM DTC's.
Turn the Wipers on.
With the scan tool, read DTCs.
Does the scan tool display: WIPER PARK SWITCH FAILURE?
Yes
- Go To2
No
- The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
- Perform BODY VERIFICATION TEST - VER 1.
2. FRONT WIPER PARK SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Front Wiper Motor harness connector.
Disconnect the Junction Block C3 harness connector.
Turn the ignition on.
Measure the voltage of the Wiper Park Switch Sense circuit in the Front Wiper Motor harness connector.
Is there any voltage present?
Yes
- Repair the Wiper Park Switch Sense circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To3
3. FRONT WIPER PARK SWITCH SENSE CIRCUIT OPEN
Turn the ignition off.
Disconnect the Front Wiper Motor harness connector.
Disconnect the Junction Block C3 harness connector.
Measure the resistance of the Wiper Park Switch Sense circuit between the Junction Block C3 harness connector and the Wiper Motor harness connector.
Is the resistance below 5.0 ohms?
Yes
- Go To4
No
- Repair the Front Wiper Park Switch Sense circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.
4. FRONT WIPER PARK SWITCH SENSE CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Front Wiper Motor harness connector.
Disconnect the Junction Block C3 harness connector.
Measure the resistance between ground and the Wiper Park Switch Sense circuit in the Junction Block C3 harness connector.
Is the resistance below 100.0 ohms?
Yes
- Repair the Front Wiper Park Switch Sense circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Go To5
5. GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Front Wiper Motor harness connector.
Using a 12-volt test light connected to 12-volts, test the Ground circuit in the Front Wiper Motor harness connector.
Does the test light illuminate brightly?
Yes
- Go To6
No
- Repair the Wiper Motor Ground circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.
6. WIPER MOTOR
Turn the ignition off.
Disconnect the Front Wiper Motor harness connector.
Turn the ignition on.
Connect a jumper wire from the Wiper Park Switch Sense circuit to ground.
With the scan tool in Inputs/Outputs read: Wiper Park Switch state.
Did the Wiper Park Switch Input change state when connected to ground?
Yes
- Replace the Wiper Motor.
- Perform BODY VERIFICATION TEST - VER 1.
No
- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1.