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.

TEST CONDITIONS

This DTC will set when the CCM detects a resistance of 14650 ohms or mode, or a short to B+ in CKT 1073 and CKT 1074.

FAILURE CONDITIONS

A fault that lasts longer than 2 seconds will set a DTC 43. The CCM checks for this fault when IGN 1 is "ON."

ACTION TAKEN

If this fault is detected, a DTC 43 will set and the vehicle will experience a PASS-Key(R)II lockout due to this DTC being detected.

TEST DESCRIPTION

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

1. This test is a quick check 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 code, 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.

If there is an open in CKT 1073 or CKT 1074, the vehicle may exhibit a no-crank condition. If there is a short to B+ in CKT 1073, there may also be a no-crank condition. IGN 1 must be present for DTC 43 to set.