Driver Seat Heat Output Short To GND
NOTE:
After making any repairs, perform MEMORY SYSTEMS VERIFICATION TEST
under VERIFICATION TESTS.
- Turn ignition on. Raise driver seat to highest position to gain access to seat components and connectors. Turn ignition off. Disconnect driver heated seat cushion 4-pin connector. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select BODY MEMORY SEAT MODULE, then clear DTCs. Turn ignition off for 20 seconds. Turn ignition on. Using scan tool, retrieve DTCs. If DRIVER SEAT HEAT OUTPUT SHORT TO GND DTC resets, leave driver heated seat cushion 4-pin connector disconnected, and go to next step. If DRIVER SEAT HEAT OUTPUT SHORT TO GND DTC does not reset, leave driver heated seat cushion 4-pin connector disconnected, and go to step 3 .
- Turn ignition off. Disconnect Memory Heated Seat/Mirror Module (MHSMM) connector C3. Measure resistance between ground and MHSMM connector C3 terminal No. 12, driver seat heater B+ driver circuit (Red/Dark Green wire). See Figure . If resistance is less than 100 ohms, repair short to ground in Red/Dark Green wire. If resistance is 100 ohms or more, replace MHSMM.
- Measure resistance between ground and driver heated seat cushion connector (component side) terminal "A", driver seat heater B+ circuit. See Figure . If resistance is less than 5 ohms, replace driver heated seat cushion. If resistance is 5 ohms or more, leave driver heated seat cushion 4-pin connector disconnected, and go to next step.
- Disconnect driver heated seat back cushion 2-pin connector. Measure resistance between ground and driver heated seat back cushion 2-pin connector terminal "A", heated seat driver circuit (Brown/Black wire). See Fig 1 . If resistance is less than 100 ohms, repair short to ground in Brown/Black wire. If resistance is 100 ohms or more, leave driver heated seat back 2-pin connector disconnected, and go to next step.
- Connect driver heated seat cushion 4-pin connector. Measure resistance between ground and driver heated seat back cushion 2-pin connector terminal "A", heated seat driver circuit (Brown/Black wire). If resistance is less than 5 ohms, replace driver heated seat back cushion. If resistance is 5 ohms or more, 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.