RAM 2500 Truck 4WD V10-8.0L VIN W HDC (2000)
Seat Heater Thermostat: Testing and Inspection
Heated Seat Element Replacement
The heated seat module will self-diagnose shorted or open heated seat element circuits and the sensor circuits. Refer to Heated Seat System diagnosis
and testing procedures. To manually check the heated seat element and sensor circuits, proceed as follows. The wire harness connectors for the seat
cushion heated seat element and sensor and for the seat back heated seat element are located under the seat, near the rear edge of the seat cushion frame.
1. Disconnect and isolate the battery negative cable. Disconnect the 4-way heated seat wire harness connector. Check for continuity between the two
heated seat element circuit cavities in the seat cushion trim cover half of the 4-way heated seat wire harness connector. There should be continuity.
If OK, go to Step 2. If not OK, go to Step 3.
2. Check for continuity between one of the heated seat element circuit cavities in the seat cushion trim cover half of the 4-way heated seat wire
harness connector and the seat cushion frame. There should be no continuity. If OK, go to Step 5. If not OK, go to Step 4.
3. Disconnect the 2-way heated seat wire harness connector between the seat cushion trim cover and the seat back trim cover. Check for continuity
between the heated seat element circuit cavity and the ground circuit cavity in the seat back trim cover half of the 2-way heated seat wire harness
connector. There should be continuity. If OK, go to Step 5. If not OK, replace the faulty seat back trim cover unit.
4. Check for continuity between the heated seat element circuit cavity in the seat back trim cover half of the 2-way heated seat wire harness connector
and the seat back frame. There should be no continuity. If OK, go to Step 5. If not OK, replace the faulty seat back trim cover unit.
5. Test the seat wire harness between the heated seat module connector and the 4-way heated seat wire harness connectors for shorted or open
circuits. If OK, replace the faulty seat cushion trim cover unit. If not OK, repair the shorted or open seat wire harness as required.
