Central Control Module (CCM)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

CKT 1073 and CKT 1074 connect the ignition lock cylinder to the CCM. Contacts in the ignition lock cylinder mate with those on the pellet (part of the ignition key) and the CCM compares the resistance value of the key pellet to the "valid" resistance programmed into the CCM at vehicle assembly.

DTC WILL SET WHEN

The CCM detects a resistance greater than 14650 ohms or a short to B+ in CKT 1073 and CKT 1074 that last longer than 2 seconds with the ignition to "RUN." IGN 1 must be present for DTC 43 to set.

ACTION TAKEN

DTC 43 will set. If then is an open in CKT 1074, the vehicle will exhibit a no-crank condition. If there is a short to B+, or open in CKT 1073, there will be a no-crank condition, and the "PASS KEY FAULT" telltale will flash.

DTC WILL CLEAR WHEN

DTC 43 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 is a quick of ignition key pellet.

2. This test checks for above normal PASS-Key(R) II counts.

3. This test checks for a short to B+ or open in CKT 1073.

4. This test checks for a short to B+ in CKT 1074.

5. This test checks for an open in CKT 1074.

DIAGNOSTIC AIDS

If the DTC is a history DTC, the problem may be intermittent. Try performing the tests shown while "wiggling" wiring and connectors; this can often cause the fault to appear.

Make sure the key resistor contacts are clean and free of any grease, oil, etc. These substances could interfere with the key detection circuit and set a DTC.