B2559

CIRCUIT DESCRIPTION
The Body Control Module (BCM) receives an active ground from the courtesy lamp ground circuit. The sole purpose of this input is to provide a ground path for all courtesy lamp current flowing through the courtesy lamp low control circuit.

CONDITIONS FOR RUNNING THE DTC
If the input does not match a normal ground potential.

CONDITIONS FOR SETTING THE DTC
^ The BCM detects a open when a ground is expected.
^ The condition above must be present for more than 0.3 seconds

ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2559 in memory.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC B2559 will clear if the open is no longer detected by the BCM.
^ A history DTC B2559 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present nor any other malfunction in the BCM is detected.
^ The BCM receives a clear code command from the scan tool.

DIAGNOSTIC AIDS
^ If the DTC B2559 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent open in the theater dimming ground circuit.
- The BCM is intermittently opened.

TEST DESCRIPTION

Steps 1-6:

The number(s) below refer to the step number(s) on the diagnostic table.
3. Checks for a short to ground in the courtesy lamps ground circuit.