Page 1009 of 4284

Symptom:
REAR WIPER OUTPUT OPEN
When Monitored and Set Condition:
REAR WIPER OUTPUT OPEN
When Monitored: Ignition on.
Set Condition: The Output is ON, the Output Driver Status is LOW and there is no Park
signal.
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
REAR WIPER MOTOR CONTROL CIRCUIT OPEN
REAR WIPER MOTOR GROUND OPEN
REAR WIPER MOTOR CONTROL CIRCUIT SHORT TO VOLTAGE
REAR WIPER MOTOR
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
Turn on the Rear Wiper.
Does the Rear Wiper Function?All
Ye s®Go To 2
No®Go To 3
2 Turn the ignition on.
With the DRBIIIt, erase all BCM and FCM DTCs.
Turn the ignition off.
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?All
Ye s®Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
980
WINDSHIELD WIPER & WASHER
Page 1010 of 4284

TEST ACTION APPLICABILITY
3 Turn the ignition off to the lock position.
Disconnect the Rear Wiper Motor harness connector.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the Rear Wiper Motor Control
circuit in the Rear Wiper Motor harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Turn ON the Rear Wiper Motor.
Does the test light illuminate brightly?All
Ye s®Go To 4
No®Go To 5
4 Turn the ignition off to the lock position.
Disconnect the Rear Wiper Motor harness connector.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Using a 12-volt test light connected to 12 Volts, check the Rear Wiper Motor ground
circuit in the Rear Wiper Motor harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s®Replace the Rear Wiper Motor in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No®Repair the Rear Wiper Motor ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
5 Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Disconnect the Rear Wiper Motor harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Rear Wiper Motor Control Circuit from the Body
Control Module harness connector to the Rear Wiper Motor harness connector.
Is the resistance above 5.0 ohms?All
Ye s®Repair the Rear Wiper Motor Control Circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 6
6 Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Disconnect the Rear Wiper Motor harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Rear Wiper Motor Control
circuit.
Is the test light on?All
Ye s®Repair the Rear Wiper Motor Control Circuit for a short to
voltage.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the Body Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
981
WINDSHIELD WIPER & WASHER
REAR WIPER OUTPUT OPEN ÐContinued
Page 1011 of 4284

Symptom:
REAR WIPER OUTPUT SHORT TO GROUND
When Monitored and Set Condition:
REAR WIPER OUTPUT SHORT TO GROUND
When Monitored: Ignition ON
Set Condition:
POSSIBLE CAUSES
REAR WIPER MOTOR FUNCTION
INTERMITTENT WIRING AND CONNECTORS
REAR WIPER MOTOR CONTROL CIRCUIT SHORT TO GROUND
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
Turn on the Rear Wiper.
Does the Rear Wiper Function?All
Ye s®Go To 2
No®Go To 3
2 Turn the ignition on.
With the DRBIIIt, erase all BCM and FCM DTCs.
Turn the ignition off.
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?All
Ye s®Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
3 Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Disconnect the Rear Wiper Motor harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Rear Wiper Motor Control circuit.
Is the resistance less than 5.0 ohms?All
Ye s®Repair the Rear Wiper Motor Control Circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 4
982
WINDSHIELD WIPER & WASHER
Page 1012 of 4284
TEST ACTION APPLICABILITY
4 Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Connect a 20A Fused jumper wire between B+ and the Rear Wiper Motor Signal
circuit in the Body Control Module connector harness.
NOTE: An internal short in the Wiper Motor may cause the fuse to open.
Does the Wiper Motor function?All
Ye s®Replace the Body Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the Rear Wiper Motor in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
983
WINDSHIELD WIPER & WASHER
REAR WIPER OUTPUT SHORT TO GROUND ÐContinued
Page 1013 of 4284

Symptom:
REAR WIPER SWITCH MUX INPUT OPEN
When Monitored and Set Condition:
REAR WIPER SWITCH MUX INPUT OPEN
When Monitored: Ignition ON
Set Condition: A Sensor voltage is over 4.76 volts for more than .125 seconds.
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
REAR WIPER SWITCH MUX CIRCUIT OPEN
REAR WIPER SWITCH MUX RETURN CIRCUIT OPEN
REAR WIPER SWITCH OPEN
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, select Body, Body Control Module and read the R Wiper Switch Sensor
voltage.
Does the DRB display a Switch voltage greater than 4.5 volts?All
Ye s®Go To 2
No®Go To 5
2 Turn the ignition off.
Disconnect the Rear Wiper Switch harness connector.
Connect a jumper wire between the Rear Wiper Switch MUX circuit and the Rear
Wiper Switch MUX Return circuit in the Rear Wiper Switch harness connector.
Turn the ignition on.
With the DRB, select Body, Body Controller and read the Rear Wiper SW volts.
Does the DRB R Wiper Switch Sensor voltage read less than 0.3 Volts?All
Ye s®Replace the Rear Wiper Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 3
3 Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Disconnect the Rear Wiper Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Rear Wiper Switch MUX circuit from the Body Control
Module connector to the Rear Wiper Switch harness connector.
Is the resistance above 5.0 ohms?All
Ye s®Repair the Rear Wiper Switch MUX circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 4
984
WINDSHIELD WIPER & WASHER
Page 1014 of 4284

TEST ACTION APPLICABILITY
4 Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Disconnect the Rear Wiper Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Rear Wiper Switch MUX Return circuit from the Body
Control Module connector to the Rear Wiper Switch harness connector.
Is the resistance above 5.0 ohms?All
Ye s®Repair the Rear Wiper Switch MUX Return circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the Body Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
5 Turn the ignition on.
With the DRBIIIt, erase all BCM and FCM DTCs.
Turn the ignition off.
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?All
Ye s®Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
985
WINDSHIELD WIPER & WASHER
REAR WIPER SWITCH MUX INPUT OPEN ÐContinued
Page 1015 of 4284

Symptom:
REAR WIPER SWITCH MUX INPUT SHORT TO GROUND
When Monitored and Set Condition:
REAR WIPER SWITCH MUX INPUT SHORT TO GROUND
When Monitored: Ignition ON
Set Condition: A Sensor voltage is below 0.24 volts for more than 0.125 seconds.
POSSIBLE CAUSES
REAR WIPER SWITCH SHORTED
INTERMITTENT WIRING AND CONNECTORS
REAR WIPER SWITCH MUX CIRCUIT SHORT TO GROUND
REAR WIPER SWITCH MUX RETURN CIRCUIT SHORT TO GROUND
REAR WIPER SWITCH MUX CIRCUIT SHORT TO MUX RETURN CIRCUIT
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, select Body, Body Control Module and read the R Wiper Switch Sensor
voltage.
Does the DRB display a Switch voltage less than 0.4 volts?All
Ye s®Go To 2
No®Go To 6
2 Turn the ignition off.
Disconnect the Rear Wiper Switch harness connector.
Turn the ignition on.
With the DRB, select Body, Body Control Module and read the R Wiper Switch Sensor
voltage..
Does the DRB display more than 4.8 volts?All
Ye s®Replace the Rear Wiper Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 3
3 Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Disconnect the Rear Wiper Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Rear Wiper Switch MUX circuit.
Is the resistance less than 5.0 ohms?All
Ye s®Repair the Rear Wiper Switch MUX Circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 4
986
WINDSHIELD WIPER & WASHER
Page 1016 of 4284

TEST ACTION APPLICABILITY
4 Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Disconnect the Rear Wiper Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Rear Wiper Switch MUX Return circuit and the
Rear Wiper Switch MUX circuit.
Is the resistance less than 5.0 ohms?All
Ye s®Repair the Rear Wiper Switch MUX Circuit for a short to the Rear
Wiper Switch MUX Return circuit.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 5
5 Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Disconnect the Rear Wiper Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Rear Wiper Switch MUX Return
circuit.
Is the resistance less than 5.0 ohms?All
Ye s®Repair the Rear Wiper Switch MUX Return Circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the Body Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
6 Turn the ignition on.
With the DRBIIIt, erase all BCM and FCM DTCs.
Turn the ignition off.
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?All
Ye s®Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
987
WINDSHIELD WIPER & WASHER
REAR WIPER SWITCH MUX INPUT SHORT TO GROUND ÐContinued