B2585

DTC B2585

CIRCUIT DESCRIPTION




The body control module (BCM) turns on the auto park lamp control relay when the ambient light sensor senses a dark condition. Battery positive voltage is supplied to the park lamp relay at all times through the PARK LAMP fuse. The BCM grounds the park lamp relay control circuit in order to activate the relay.

CONDITIONS FOR RUNNING THE DTC
- The ignition switch is in the ON position.
- The ambient light sensor senses a dark condition (automatic lamp control (ALC) park lamps on).

CONDITIONS FOR SETTING THE DTC
- The park lamp relay control circuit is open or shorted to voltage for 5 seconds.
- The park lamp supply voltage circuit is open or shorted to ground for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
The SERVICE indicator will illuminate.

CONDITIONS FOR CLEARING THE DTC
- The conditions for setting the DTC are no longer present.
- A history DTC clears after 100 malfunction free ignition cycles.
- The BCM receives the clear code command from the scan tool.

DIAGNOSTIC AIDS
If the DTC is a history DTC, the problem may be intermittent.

TEST DESCRIPTION

Steps 1-12:

The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the park lamp relay operates. Command both the ON and OFF states. Repeat the commands, as necessary.
3. Tests for voltage at the coil side of the park lamp relay. The PARK LAMP fuse supplies battery positive voltage to the coil side of the park lamp relay.
4. Verifies that the BCM is providing ground to the park lamp relay.