Lumbar Support Inoperative (with Memory)

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Lumbar Support Schematics Connector End View Reference: Power Seat Systems Connector End Views
1	Did you perform the Power Seat Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Power Seat Systems
2	Operate the lumbar switch in all directions. Does the system operate normally?	Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems	Go to Step 3
3	Install a scan tool. Observe the Lumbar/Bolster Switch parameter in the seat module Inputs/Outputs data list. Operate the lumbar switch in all directions. Does the scan tool display the correct switch parameter in relation to the actual switch position?	Go to Step 6	Go to Step 4
4	Disconnect the lumbar switch connector. Connect a test lamp from the battery voltage supply circuit terminal in the harness connector to ground. Does the test lamp illuminate?	Go to Step 5	Go to Step 7
5	Observe the Lumbar/Bolster Switch parameter in the seat module Inputs/Outputs data list. Connect a 3 amp fused jumper wire from the battery voltage supply circuit terminal to the inoperative switch signal circuit terminal in the lumbar switch harness connector. Does the scan tool indicate the correct switch signal circuit is active?	Go to Step 10	Go to Step 8
6	Disconnect the inoperative lumbar adjuster motor connector. Connect a test lamp between the adjuster motor control circuit terminals in the harness connector. Operate the appropriate lumbar switch in both directions. Does the test lamp illuminate while the switch is pressed in both directions?	Go to Step 11	Go to Step 9
7	Test the battery voltage supply circuit to the lumbar switch for an open or short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 12
8	Test the inoperative lumbar switch signal circuit for an open or short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 12
9	Test the inoperative lumbar adjuster motor control circuits for an open or short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 12
10	Inspect for poor connections at the harness connector of the lumbar switch. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 13
11	Inspect for poor connections at the harness connector of the lumbar adjuster motor. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 14
12	Inspect for poor connections at the harness connector of the seat module. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 15
13	Replace the lumbar switch. Refer to Lumbar Switch Replacement - Front . Did you complete the replacement?	Go to Step 16	-
14	Replace the inoperative lumbar adjuster motor. Refer to Lumbar Replacement - Front Seat . Did you complete the replacement?	Go to Step 16	-
15	Replace the seat module. Refer to Memory Seat Control Module Replacement Did you complete the replacement?	Go to Step 16	-
16	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3