RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Seat Heater Control Module: Testing and Inspection
If a heated seat fails to heat and one or both of the indicator lamps on a heated seat switch flash, refer to Diagnosis and Testing Heated Seat System in
Heated Seats for the location of flashing LED heated seat system diagnosis and testing procedures. 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.
1. Check the heated seat element (Refer to HEATED SEATS/HEATED SEAT ELEMENT - DIAGNOSIS AND TESTING).
2. Check the heated seat sensor (Refer to HEATED SEATS/HEATED SEAT SENSOR - DIAGNOSIS AND TESTING).
3. Check the heated seat switch (Refer to HEATED SEATS/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.
4. Using a voltmeter, backprobe the appropriate heated seat module connector, do not disconnect. Check for voltage at the appropriate pin cavities.
12v should be present. If OK go to Step 5, if Not, Repair the open or shorted voltage supply circuit as required.
5. Using a ohmmeter, backprobe 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.
