B2588

DTC B2588

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 control 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 shorted to voltage for 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The BCM turns off the auto park lamp control relay control circuit for the remainder of the ignition cycle.
- The SERVICE indicator illuminates.
- 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.

TEST DESCRIPTION

Steps 1 - 6:

The number below refers to the step number 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.