Heated Seats Inoperative (Due To Key-In Ignition Switch Status)
NOTE:
After making any repairs, perform MEMORY SYSTEMS VERIFICATION TEST
under VERIFICATION TESTS.
- Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select BODY COMPUTER, then INPUT. Using scan tool, read KEY-IN IGNITION SWITCH status. If scan tool does not display KEY-IN IGN: CLOSED, go to next step. If scan tool displays KEY-IN IGN: CLOSED, fault may be intermittent. Check related wiring and connectors for poor connections or damage to wiring harness. See WIRING DIAGRAMS . Repair any problems found as necessary. If no problems are found, check if any Technical Service Bulletins (TSBs) apply to vehicle. If no TSBs apply, test is complete.
- Turn ignition off. Disconnect ignition switch connector. Connect a jumper wire between ground and ignition switch connector terminal No. l, key-in ignition switch sense circuit (Light Blue wire). See Fig 1 . Using scan tool, read KEY-IN IGNITION status. If scan tool displays KEY-IN IGN: CLOSED, replace ignition switch. If scan tool does not display KEY-IN IGN: CLOSED, leave ignition switch connector disconnected, and go to next step.
- Turn off all lights. Measure resistance between ground and ignition switch connector terminal No. 3, ground circuit (Black/Light Green wire). If resistance is less than 5 ohms, leave ignition switch connector disconnected, and go to next step. If resistance is 5 ohms or more, repair open in Black/Light Green wire.
- Disconnect Body Control Module (BCM) connector C2. Measure resistance of key-in ignition switch sense circuit (Light Blue wire) between ignition switch connector terminal No. 1 and BCM connector C2 terminal No. 24. See Figure and Fig 1 . If resistance is less than 5 ohms, replace BCM. If resistance is 5 ohms or more, repair open in Light Blue wire.