Thread: LR4 Smart Key Not Found, No Power on Centre Console, A/C, Dash, Speedo, Tacho

The KVM is the only user of fuse 17P.

The high voltage on the module side of the fuse-holder with the fuse removed is not necessarily an indication of a malfunction. If a light globe is connected to it the voltage may drop to nil.

The facilities that stop working with the fuse fitted are all the devices on the medium speed canbus. A faulty door lock or handle or its wiring could be causing the KVM to malfunction so unplugging those modules from the KVM would be necessary to exclude them as suspects.

Originally Posted by Graeme

The KVM is the only user of fuse 17P.

The high voltage on the module side of the fuse-holder with the fuse removed is not necessarily an indication of a malfunction. If a light globe is connected to it the voltage may drop to nil.

The facilities that stop working with the fuse fitted are all the devices on the medium speed canbus. A faulty door lock or handle or its wiring could be causing the KVM to malfunction so unplugging those modules from the KVM would be necessary to exclude them as suspects.

I found this in the internet. Item 6 is the KVM located in the roof at the middle of the car. I'll search on how to get to it.

I found a wiring diagram, too. I'm no expert on this but I can see what you mentioned that it's feeding the door switches and antennas.

Like what you said, if I can get to the KVM then I can unplug the modules one by one.

3Voiz,
It appears you are on the right path. Process of elimination. Well done. Just a heads up not to discount a wiring loom section because wriggling it had no effect. If possible to disconnect the canbus wiring at the KVM module and end device, I would test each wires resistance and to confirm no continuity to earth, and visually inspect the wires at points of interest. I.e. where they pass through panels, are subject to movement/bending or are in located in tight spots and at termination points. I would be guessing it is highly likely the canbus wires, as the other wiring appears to actually switch to earth as a normal function. My canbus wire had the smallest split in it, very hard to see, but with the loom located in an obvious pinch point, a detailed closer inspection of the wiring in that loom section revealed the culprit wire defect.

Best of luck to you. Hope you or the Indy find whatever the fault is without too much dismantling.

Other than the fault itself, I was very much disappointed my 11 day old vehicle had almost all internal panels dismantled.

Originally Posted by Mungus

3Voiz,
It appears you are on the right path. Process of elimination. Well done. Just a heads up not to discount a wiring loom section because wriggling it had no effect. If possible to disconnect the canbus wiring at the KVM module and end device, I would test each wires resistance and to confirm no continuity to earth, and visually inspect the wires at points of interest. I.e. where they pass through panels, are subject to movement/bending or are in located in tight spots and at termination points. I would be guessing it is highly likely the canbus wires, as the other wiring appears to actually switch to earth as a normal function. My canbus wire had the smallest split in it, very hard to see, but with the loom located in an obvious pinch point, a detailed closer inspection of the wiring in that loom section revealed the culprit wire defect.

Best of luck to you. Hope you or the Indy find whatever the fault is without too much dismantling.

Other than the fault itself, I was very much disappointed my 11 day old vehicle had almost all internal panels dismantled.

The rear of my car flooded from a failed water bag a couple weeks ago. Under the rear seats, under the carpet are two antennas, the wiring looms for them would get damaged in my opinion if you didn't have rear seats.

Originally Posted by josh.huber

The rear of my car flooded from a failed water bag a couple weeks ago. Under the rear seats, under the carpet are two antennas, the wiring looms for them would get damaged in my opinion if you didn't have rear seats.

Hi Josh. Are you referring to the third row seats? I'll look for these two antennas and check them.

I don't know where the KVM antennas are. I needed to find a drawing showing their locations`