Central Control Module (CCM)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The park lamp relay coil circuit can be completed by the CCM, remote keyless entry receiver/UTD, or the headlight switch. Anyone of these three components will enable the parking lamp relay coil to pull the contacts in, thus allowing current to flow from B+ to CKT 9.

TEST CONDITIONS

This fault can only be detected when the CCM is attempting to turn the park lights "ON."

FAILURE CONDITIONS

DTC 35 will set if CKT 1345 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.

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 1345.

2. This test cheeks for an internal short in the relay between terminals "D1" and "D3", which would cause a short to battery condition by allowing power from the 20 amp park, taillamp fuse into the circuit.

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

4. This test checks for a defective headlight switch.

5. This test checks for a defective Remote Keyless Entry/Universal Theft Deterrent (RKE/UTD) receiver.

DIAGNOSTIC AIDS

Do not turn the park lamp switch "ON" (headlight switch), if DTC 35 is current The headlight switch may short out because of excessive current flow through CKT 1345.

If the DTC is a history code, the problem may be intermittent. Try performing the test shown while "wiggling" wiring and connectors; this can often cause the fault to appear. Check for poor connections at both the CCM and the park lamp relay connector; these could cause an open or an intermittent fault. Refer to "Intermittents/History Codes/Poor Connections". Intermittents/History DTCs

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