Diagnostic Routine B

Diagnostic Routine B

Diagnostic Overview

The Wiper Is Inoperative - Rear Window

Refer to Wiring Diagram Set 81 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

REFER to Rear Wiper Operation . An internal failure in one or more of the rear window wiper system components or a disruption in the power or ground circuits causes the rear window wiper to become inoperative.

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

Make sure BJB (Battery Junction Box) fuse 42 (15A) is OK.

Make sure BCM (Body Control Module) fuse 72 (7.5A) is OK.

Special Tool(s)






Pinpoint Test

1. CHECK FOR BCM (Body Control Module) DTCs (Diagnostic Trouble Codes)

1. Ignition ON.

2. Using a scan tool, carry out the BCM (Body Control Module) self-test.

Are any BCM (Body Control Module) DTCs (Diagnostic Trouble Codes) present?







2. CHECK THE REAR WINDOW WIPER MOTOR RELAY CONTROL CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

1. Ignition OFF.

2. Remove the Rear Wiper Relay.

3. Disconnect BCM (Body Control Module) C2280B.

4. Measure:





Is the resistance less than 3 ohms?







3. CHECK THE REAR WIPER RELAY

1. Carry out the Relay-Micro ISO (International Organization for Standardization) component test.

Did the relay pass the test?







4. CHECK THE BCM (Body Control Module) WIPER/WASHER SWITCH PIDs (Parameter Identifications)

1. Connect BCM (Body Control Module) C2280B.

2. Ignition ON.

3. Using a scan tool, view the following BCM (Body Control Module) PIDs (Parameter Identifications):

- Wiper Stalk Illegal Combination (WPR_SW_ICOM)
- Wiper Stalk Stuck Position or Button (WPR_SW_STK)

4. While monitoring the PIDs (Parameter Identifications), place the wiper/washer switch into the rear window LOW position.

Does either PID (Parameter Identification) display TRUE when the wiper/washer switch is in the rear window LOW position?







5. CHECK THE VOLTAGE TO THE REAR WIPER RELAY

1. Measure:





Are the voltages greater than 11 volts?







6. CHECK THE REAR WINDOW WIPER MOTOR RELAY INPUT CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Disconnect the Rear Window Wiper Motor electrical connector.

3. Measure:





Is the resistance less than 3 ohms?







7. CHECK THE REAR WINDOW WIPER MOTOR VOLTAGE INPUT CIRCUIT FOR AN OPEN

1. Measure:





Is the resistance less than 3 ohms?







8. CHECK THE REAR WINDOW WIPER MOTOR GROUND CIRCUIT FOR AN OPEN

1. Measure:





Is the resistance less than 3 ohms?







9. CHECK THE REAR WINDOW WIPER MOTOR VOLTAGE CIRCUIT FOR AN OPEN

NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning of this system. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.

1. Install the Rear Wiper Relay.

2. Ignition ON.

3. Measure:





4. Place the wiper/washer switch into the rear window wiper intermittent position and observe the test light.

Does the test light illuminate briefly approximately once every 3 to 5 seconds?







10. CHECK FOR CORRECT BCM (Body Control Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect BCM (Body Control Module) C2208B.

3. Repair:

- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

4. Connect BCM (Body Control Module) C2208B. Make sure it seats and latches correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?