B2457

CIRCUIT DESCRIPTION
The body control module (BCM) controls the courtesy lamps theatre dimming. The BCM grounds the lamps directly. The ground will slowly reduce in order to turn the lamps to the OFF position. If there is an open or a short to ground condition in the interior lamp control circuit, DTC B2457 will set.

CONDITIONS FOR SETTING THE DTC
The BCM detects a short to ground or an open in the interior lamp control circuit for more than 0.15 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ Stores DTC B2457 in the BCM memory.
^ No driver warning message will be displayed for this DTC.

CONDITIONS FOR CLEARING THE DTC
^ The short to ground is no longer detected by the BCM on the interior lamp control circuit.
^ An open circuit is no longer detected by the BCM on the interior lamp control circuit.
^ A history DTC clears after 50 consecutive ignition cycles if the condition for the fault is no longer present.

TEST DESCRIPTION

Steps 1-5:

The numbers below refer to the step numbers on the diagnostic table.
2. This step test the interior lamp control circuit for a short to ground or and open circuit.