B2585

DTC B2585

CIRCUIT DESCRIPTION
The body control module (BCM) monitors the voltage on the Interior park lamps fused supply voltage circuit in order to determine the actual state of the park lamp relay. The BCM also uses the park lamp relay control circuit in order to energize the park lamp relay.

CONDITIONS FOR RUNNING THE DTC
- The key is in the RUN position.
- The park brake is released.
- The headlamp and panel dimmer switch is in the AUTO mode.
- The ambient light sensor is in the DARK state.
- The system voltage must be between 9 and 16 volts.

CONDITIONS FOR SETTING THE DTC
- The key is in the RUN position.
- The park brake is released.
- The headlamp and panel dimmer switch is in the AUTO mode.
- The ambient light sensor is in the DARK state.
- There is a short to ground in the Interior park lamps fused supply voltage circuit or an open in the park lamp relay control circuit.
- If the Interior park lamp fused supply voltage circuit is open, regardless of the headlamp and panel dimmer switch position, the DTC will set.
- If the park lamp relay control circuit is open, with the headlamp and panel dimmer switch in the AUTO mode, the DTC will set.
- The system voltage must be between 9 and 16 volts.
- The above conditions must be met for 0.5 seconds.

ACTION TAKEN WHEN THE DTC SETS
The park lamps will be inoperative in the AUTO mode.

CONDITIONS FOR CLEARING THE MIL/DTC
- A current DTC will clear immediately when the condition for setting the fault is corrected with the key ON.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- Use a scan tool in order to clear the history and current DTCs.

DIAGNOSTIC AIDS

IMPORTANT: Use the appropriate probe from the J 35616-B for any probing of electrical components in this table, in order to prevent damage to them.

Perform a visual inspection for loose or poor connections at all related components.

TEST DESCRIPTION

Steps 1-3:

Steps 4-9:

Steps 10-16:

Steps 17-24:

The numbers below refer to the step numbers on the diagnostic table.
2. Command both the ON and OFF states. Repeat the commands as necessary.
3. This step determines if the condition is located on the coil side or the switch side of the circuit.
5. This step determines if the body control module (BCM) is providing ground for the park lamp relay.
6. This step determines if a ground is constantly being applied to the park lamp relay.
23. After you replace the BCM, you must calibrate the new module for proper operation.