Diagnostic Routine AF

Diagnostic Routine AF

Diagnostic Overview

U0201:87

Normal Operation and Fault Conditions

The DRDM (Driver Rear Door Module) communicates with the DDM (Driver Door Module) over a dedicated LIN (Local Interconnect Network). The DDM (Driver Door Module) also receives information from the switch pack on the driver door on the LIN (Local Interconnect Network).

In the event of a failure on the LIN (Local Interconnect Network) that causes the DDM (Driver Door Module) to not communicate with the DRDM (Driver Rear Door Module), the power windows, power locks and switch illumination will be inoperative in the rear door.

DTC Fault Trigger Conditions






Pinpoint Test

1. RETRIEVE THE DTCs (Diagnostic Trouble Codes) IN THE DDM (Driver Door Module)

1. Ignition ON.

2. Using a scan tool, perform the DDM (Driver Door Module) self-test.

Is DTC (Diagnostic Trouble Code) B1087:83, 86, or 88 retrieved?






2. CHECK THE DRDM (Driver Rear Door Module) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Disconnect: DRDM (Driver Rear Door Module).

3. Ignition ON.

4. Measure:





Is the voltage greater than 11 volts?






3. CHECK THE DRDM (Driver Rear Door Module) GROUND CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Measure:





Is the resistance less than 3 ohms?






4. CHECK THE LIN (Local Interconnect Network) FOR AN OPEN

1. Disconnect: DDM (Driver Door Module).

2. Measure:





Is the resistance less than 3 ohms?






5. CHECK FOR CORRECT DRDM (Driver Rear Door Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect the DRDM (Driver Rear Door Module) connector.

3. Repair:

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

4. Reconnect the DRDM (Driver Rear Door Module) connector. Make sure it seats and latches correctly.

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

Is the concern still present?