Central Control Module (CCM)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The park lamp relay coil circuit can be completed by the CCM, Remote Control Door Lock Receiver/Theft Deterrent (RCDLR/TD) module, or the headlamp switch. Anyone of these three components by grounding CKT 301, will enable the park lamp relay coil to pull the contacts in, thus allowing current to flow from B+ to CKT 256.

DTC WILL SET WHEN

CKT 301 stays in a high state for more than 2 seconds, while the CCM is attempting to turn "ON" the park lamps.

ACTION TAKEN

DTC 35 will set. Park lamps will not come "ON" at all.

DTC WILL CLEAR WHEN

DTC 35 will clear if the fault goes away for 2 or more seconds.

DTC CHART TEST DESCRIPTION

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

1. This test checks for a short to B+ in CKT 301.

2. This test checks for an internal short in the relay between terminals "86" and "30", which would cause a short to battery condition by allowing power from the 20 amp I/P fuse #31 into the circuit.

3. This test checks for an internal short in the relay coil.

4. This test checks for an internal short in the relay coil.

5. This test checks for a defective RCDLR/TD module.

DIAGNOSTIC AIDS

Do not turn the park lamp switch "ON" (headlamp switch), if DTC 35 is current. The headlamp switch may short out because of excessive current flow through CKT 301.

If the DTC is a history DTC, the problem may be intermittent. Try performing the test shown while "wiggling" wiring and connectors: this can often cause the fault to appear. Refer to "Intermittents/History DTCs".Intermittents/History DTCs

A Tech 1 can be used to activate the park lamp relay.