B2618

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

CONDITIONS FOR RUNNING THE DTC
The BCM must command the courtesy lamp low control circuit on.

CONDITIONS FOR SETTING THE DTC
^ The BCM detects a high when the output should be low in the courtesy lamp low 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 courtesy lamp low 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 a 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.
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to battery in the courtesy lamp low control circuit.
- 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 short to voltage in the courtesy lamp low control circuit.