Hello. My 2001 Ram 2500 has a problem with the heated mirrors. The passenger side heats up but the driver side does not. Any tips on how I should go about trobleshooting would be greatly appreciated. Thank you.

 

I would check for a broken wire first, probably where they go into the door. I've never had my heated mirrors apart so maybe someone else will chime in here....

 

Heated Mirror Grid Test


1. Disconnect and isolate the battery negative cable. Disconnect the door wire harness connector from the power mirror wire harness connector at the power mirror with the inoperative heating grid. Check for continuity between the ground circuit cavity in the door wire harness connector for the power mirror and a good ground. If OK, go to Step 2. If not OK, repair the open ground circuit to ground as required.

2. Reconnect the battery negative cable. Turn the ignition switch to the ON position. Turn ON the heated mirror system. Check for voltage (battery voltage less the resistance in the outside mirror heating grid that is still connected) at the fused heated mirror relay output circuit cavity in the door wire harness connector for the power mirror. If OK, go to Step 3. If not OK, repair the open fused heated mirror relay output circuit to the heater and air conditioner control unit as required.

3. Check the outside mirror heating grid by testing for continuity between the ground circuit and the fused heated mirror relay output circuit cavities in the power mirror wire harness connector. There should be continuity. If not OK, replace the faulty power mirror. If OK, check the resistance through the outside mirror heating grid. The correct resistance should be from 10 to 16 ohms when measured at an ambient temperature of 21 °C (70 °F) . If not OK, replace the faulty power mirror.

 

Thanks Guys. I'll give it a try this wekend and let you know how it works out.