B2588

CIRCUIT DESCRIPTION
The Body Control Module (BCM) controls the park lamp relay. The BCM grounds the park lamp relay control circuit which energizes the park lamp relay.

CONDITIONS FOR RUNNING THE DTC
The BCM must be commanding the Park Lamp relay to energize.

CONDITIONS FOR SETTING THE DTC
^ The BCM detects a short to battery in the park lamp relay control circuit when It is trying to energize the park lamp relay.
^ The condition above must be present for more than 0.3 seconds.

ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2588 in memory.

CONDITIONS FOR CLEARING THE DTC
^ A short to battery in the park lamp relay control circuit is no longer detected by the BCM when the park lamp relay is commanded to energize. After the fault is removed the ignition must be cycled to clear the code.
^ A history DTC B2588 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ The BCM receives a clear code command from the scan tool.

DIAGNOSTIC AIDS
^ If the DTC B2588 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to battery in the park lamp relay coil control circuit.
- The park lamp relay coil is shorted to battery.
- The BCM is shorted to battery.

TEST DESCRIPTION

Steps 1-7:

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. Verifies that the BCM is providing ground to the park lamp relay. Indicating a short to voltage internal to the park lamp relay.
4. Test for a short to voltage in the control circuit of the park lamp relay.