Test D: Lumbar Support Inoperative
- Perform PRELIMINARY CHECKS
and POWER LUMBAR SUPPORT SYSTEM CHECK
under TROUBLESHOOTING. Go to next step.
- Attempt to operate lumbar support. If lumbar and lateral support operate properly, check circuits for intermittent and poor connections. If lumbar support does not operate properly, go to next step.
- Disconnect power seat cushion air control module 6-pin harness connector C1. Connect test light between ground and power seat cushion air control module harness connector C1 terminal "A" (Orange wire). See Fig 1
. If test light illuminates, go to next step. If test light does not illuminate, repair open or high resistance in Orange wire (battery feed) between power seat cushion air control module and DEFOG/SEATS circuit breaker. See WIRING DIAGRAMS
.
- Disconnect power seat cushion air control module 4-pin harness connector C2. Connect test light between power seat cushion air control module harness connector C1 terminal "A" (Orange wire) and harness connector C2 terminal "D" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 6
.
- Check for poor terminal contact at power seat cushion air control module harness connectors. Repair as necessary. Recheck system operation. If terminal contact is okay, replace power seat cushion air control module. See POWER SEAT CUSHION AIR CONTROL MODULE
under REMOVAL & INSTALLATION. Recheck system operation.
- Repair open or poor terminal contact in Black wire between power seat cushion air control module and ground. See WIRING DIAGRAMS
. Recheck system operation.
Courtesy of GENERAL MOTORS CORP.