B2618

CIRCUIT DESCRIPTION
The Body Control Module (BCM) controls the courtesy lamps through the theater dimming control circuit. The BCM grounds the theater dimming ground control circuit which completes the courtesy lamps ground circuit, and the lights illuminate.

CONDITIONS FOR RUNNING THE DTC
The BCM must command the theater dimming control feature ON.

CONDITIONS FOR SETTING THE DTC
^ The BCM detects a high when the output should be low in the theater dimming ground control circuit.
^ The condition above must be present for more than 0.3 seconds.

ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2618 in memory.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC B2618 will clear if the short to battery in the theater dimming ground control circuit is no longer detected by the BCM.
^ A history DTC B2618 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present and no other BCM faults are detected.
^ The BCM receives the Clear Code command from the scan tool.

DIAGNOSTIC AIDS
^ If the DTC B2618 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 short to battery in the theater dimming ground control circuit.
- Any courtesy lamp is intermittently shorted to battery.
- The BCM is intermittently shorted to battery.

TEST DESCRIPTION

Steps 1-6:

The number(s) below refer to the step number(s) on the diagnostic table.
2. Watch for the courtesy lamps to illuminate. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for a short to voltage in the theatre dimming 1 ground output circuit.