B2585

DTC B2585

Circuit Description

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

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2585 Park Lamp Control Circuit

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

* B2585.01 will set if there is a short to voltage in the park lamp relay control circuit.
* B2585.06 will set if there is an open or short to ground in the park lamp relay control circuit.

Action Taken When the DTC Sets

* The SERVICE indicator will illuminate.
* The check gages 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 Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

Test Description

Step 1 - Step 14:

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.
4. This step tests for voltage at the coil side of the PARK LAMP relay.
5. his step verifies that the BCM is providing ground to the PARK LAMP relay.