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 auto park lamp control relay at all times through the PARK LPS fuse. The BCM grounds the auto 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 (ALC park lamps on).

CONDITIONS FOR SETTING THE DTC
^ The auto park lamp control 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.
^ The check gauges chime sounds.

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. Refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.

TEST DESCRIPTION

Steps 1-3:

Steps 4-11:

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