Diagnosis And Testing - Heated Seat Module

If a heated seat heats but one or both indicator lamps on the heated seat switch fail to operate, test the heated seat switch. Refer to Diagnosis and Testing Heated Seat Switch in Heated Seats for heated seat switch diagnosis and testing procedures. If the heated seat switch checks OK, proceed as follows.

Check the heated seat element (Refer to HEATED SEAT ELEMENT - DIAGNOSIS AND TESTING ).
Check the heated seat sensor (Refer to HEATED SEAT SENSOR - DIAGNOSIS AND TESTING ).
Check the heated seat switch (Refer to DRIVER HEATED SEAT SWITCH - DIAGNOSIS AND TESTING ).

NOTE: Refer to Wiring for the location of complete heated seat system wiring diagrams and connector pin-out information.

Using a voltmeter, back probe the appropriate heated seat module connector, do not disconnect. Check for battery voltage at the appropriate pin cavities. If OK go to Step 5. If not OK, repair the open or shorted voltage supply circuit as required.
Using a ohmmeter, back probe the appropriate heated seat module connector, do not disconnect. Check for proper continuity to ground on the ground pin cavities. Continuity should be present. If OK replace the heated seat module with a known good unit and retest system, if Not OK, Repair the open or shorted ground circuit as required.