Chrysler Repair: driver side heated seat: 99 Chrysler 300, continuity check, resistive elements

Question
The seat on the drivers side does not heat. The passenger side works. The manual does not list a fuse for the heated seats. Any suggestions?

Answer
Hi Clarence,
The module that controls the heated seats/mirror memory is where the power for the heating is generated, so if the function works on one seat but not the other is is not a fuse/circuit breaker because there is only one such device called circuit breaker no. 2 and it must be good or neither the passenger heater nor the motion would be present were the breaker 'open'.
So you need to trace out the circuit between the module and the seat heaters for the driver side. The module is on the underside of the driver seat, at the very front edge of the seat. When you have asked for heating of the seat there should be 5 volts output on pin 12 of the 12-pin plug of the module (there are 4 plugs each with a different number of pins, the wire color is red/dark green). From that pin the wire goes to pin A at the 4-wire seat heater plug and after going through the heater it comes out on pin B and thence on a brown/black wire to pin A of the heater for the recliner/back of the seat, and out on pin B of that plug and from there to a ground on the black wire at pin B of the recliner plug. So request heat for the left seat and see if you have voltage on pin 12, or are losing the voltage along that pathway or from the recliner to ground may be "open" (which you would check via resistive continuity check with no voltage applied to the seat heaters and the plug for the recliner heater disconnected). The ground point is on the floor board under the driver seat. It could be that if you have voltage at the module that one of the resistive elements in the seat is 'open' which would be seen as a loss of voltage between pins A and B of either heating element.
Roland
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