I have an '03 XKR Coupe with 86,000 miles. When you push the button for the drivers side seat there's no light and no heat. When you push the passengers side button you get the light and the drivers side seat heats up. No heat on passenger side at all.

 

Possibly the Seat Modules have been switched LH to RH or replaced before you acquired the vehicle?

Graham

 

I'd pull the switches out and have a look. Maybe someone mixed up the connectors. and one fell off as well.

OR, the drivers switch failed, and someone intentionally did that to get at least some heat back working.

 

Where are the seat modules?

 

Have you ever had the switches out? Do you what I need to do to get at them?

 

If someone switched the modules I wouldn't think that would change which seat is activated by the button. Isn't the right switch wired to the right seat and so on? Is there another place where the wires could have been switched?

I pulled the console out so I could remove the assembly that houses the heated seat buttons, it's been apart before because some screws are missing. The heated seats, fog lights and a few other things are all part of one module that has one plug for everything. The plug looks intact so I don't think that's the problem. I got the circuit board out and pushed the switches directly and they all work except the drivers side. Maybe the board is bad but I keep coming back to how can the passenger button light up and activate the drivers side. It would have taken a lot more to rewire it then to fix it.

 

The switches aren't hard wired to the seat modules or heaters. They both feed into the Body Processor Module and that communicates with the two seat modules by the SCP network. Maybe no one told the BPM that the seat modules had been swapped? I don't know, but just trying to point out that it might be a bit more complex than at first glance?

 

The circuit is Centre Console Switchpack (the one you've had apart) - Body Processor Module - Seat Module (gray rectangular box bolted beneath the seat).

I'd be having a close look at the tracks on the board to the pinouts to see what has been done when it was taken apart by the PO.

Graham

 

The seat modules will follow the seat. So it doesn't matter if they are switched from driver to passenger side if only one is operable only the side with the good module will function.

Someone crossed the plugs for the switches in this car. It may also have a bad seat module on the passenger side, which prevents that seat from heating up.

Take care,

George

 

Which switches and where do you think they were switched. Can I switch out the seat modules from right to left? Could it be the BPM having issues?

 

David,

The seat modules are identical. The connectors to them under the seats are a little different, telling the module which seat it is controlling. The driver seat module is identified by a ground connection through the connector, the passsenger seat module does not have this ground. The modules communicate to the control panel (with the seat haeater buttons) via the commbus, the ground configures the address of the seat module on the bus.

Your passenger module may be toast, not responding at all. Your driver seat connector may be missing the ground connection, making it think it's the passenger seat.

Get the schematic available in the sticky threads, the contact is identified as SD5-1.

Steve

 

maybe buy another switch module and try it. replace one thing at a time.

00 Jaguar XK8 Heated Seat Switch Panel | eBay

 

I'm having the same problem with my car. Recently, the driver's side seat module stopped working, so I switched it out with the passenger's side. The module I bought for the passenger's side came from a car that didn't have heated seats, so I ordered a brand new unit that must be programmed.

I recently removed the seats to repair the headrests and now discovered the passenger's side heat button activates the driver's seat. I wonder if I should disconnect the battery.