Central Control Module (CCM)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

CKT 149 is used to complete the electrical circuit for the courtesy lamp system. CKT 149 is grounded by the CCM when the CCM gets a request to activate the roof rail and door courtesy lamps.

TEST CONDITIONS

The CCM tests for a short to B+ in CKT 149 when the ignition is first turned "ON," when the Delayed Interior Lighting (DIL) enable is grounded by the CCM, and courtesy output at the CCM is grounded also.

FAILURE CONDITIONS

This fault will only be detected when the CCM is trying to ground CKT 149 and CKT 149 stays high.

ACTION TAKEN

DTC 24 is set.

TEST DESCRIPTION

Number(s) below refer to circled number(s) on the diagnostic chart.

1. This test checks for a short to B+ in courtesy light system wiring or CCM.

2. This test determines if short is in CKT 149 or 823.

DIAGNOSTIC AIDS

If the DTC is a history code, the problem may be intermittent. Refer to "Intermittents/History Codes/Poor Connections". Intermittents/History DTCs

If CKT 149 is shorted to battery, the courtesy lamps will not come "ON" as intended.

A Tech 1 can be used to activate the DIL relay.