Heated Seat Inoperative

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: Heated Seats 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	Start the engine. Attempt to operate the heated seat in all of the operating modes. 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 Back Only Heat Switch parameter in the door module Inputs data list. Press and release the back only heated seat switch. Does the scan tool display Active while the switch is pressed?	Go to Step 4	Go to Step 8
4	Observe the Heated Seat Switch parameter in the door module Inputs data list. Press and release the back and cushion heated seat switch. Does the scan tool display Active while the switch is pressed?	Go to Step 5	Go to Step 8
5	Display the Seat Heat Zone parameter in the seat module Inputs/Outputs data list. Operate the heated seat switches in all of the operating modes. Does the scan tool display the correct seat heat zone parameter in relation to the heated seat switch operation?	Go to Step 6	Go to Step 9
6	Disconnect the inoperative seat heater element connector. Connect a test lamp between the voltage supply circuit terminal and the control circuit terminal in the harness connector. Operate the appropriate heated seat switch to the high mode. Does the test lamp illuminate?	Go to Step 10	Go to Step 7
7	Test the seat heater element voltage supply and control circuits in the seat harness 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 14	Go to Step 9
8	Inspect for poor connections at the harness connector of the door 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 14	Go to Step 11
9	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 14	Go to Step 12
10	Inspect for poor connections at the harness connector of the inoperative seat heater element. 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 14	Go to Step 13
11	Replace the door module. Refer to SWITCH REPLACEMENT - DOOR LOCK AND SIDE WINDOW - DRIVER in Doors. Is the repair complete?	Go to Step 14	-
12	Replace the seat module. Refer to Memory Seat Control Module Replacement . Is the repair complete?	Go to Step 14	-
13	Replace the inoperative seat heater element. Refer to Seat Cushion Cover and Pad Replacement - Front or to Seat Back Cover and Pad Replacement - Front . Is the repair complete?	Go to Step 14	-
14	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2