B2452

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The SBM controls the courtesy lamps for theater dimming. The outputs will fade out in order to turn the lamps to the OFF position. If there is an open or a short to ground in the Theater Dim #1 control circuit, a fault condition is present and a DTC will set.

CONDITIONS FOR SETTING THE DTC
The SBM detects a short to ground or an open in the Theater Dim #1 control circuit.

ACTION TAKEN WHEN THE DTC SETS
^ Stores a DTC B2452 in the SBM memory
^ No driver warning message will be displayed for this DTC.

CONDITIONS FOR CLEARING THE DTC
^ A short to ground is no longer detected by the SBM in the Theater Dim #1 control circuit.
^ An open is no longer detected by the SBM in the Theater Dim #1 control circuit.
^ A history DTC clears after 50 consecutive ignition cycles if the condition for the fault is no longer present.
^ Using the on-board diagnostic (clearing DTCs) feature.
^ Using a scan tool.

DIAGNOSTIC AIDS
The following conditions may cause an intermittent malfunction to occur:
^ An intermittent short to ground in the Theater Dim #1 control circuit
^ An intermittent open in the Theater Dim #1 control circuit
^ A short to ground or an open internally to the SBM

If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while wiggling the wiring and the connectors. This can often cause the malfunction to appear.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step tests for a short to ground or an open circuit in the Theater Dim #1 control circuit.