Hi,
This is my first question in the forum, so hopefully done this right?!

The issue I'm having is with the control panel that has the fog lamps/heated seat/traction control/hazards and headlamp angle switches:

The small red lamps to indicate weather the switches are activated have stopped working, however the buttons themselves still function as usual.
The pulsing light under the hazards switch still works but any that use the small red light have failed.

Do any of the electrical experts here know which cable in the loom controls this, as my guess is that the issue lays here. I have tried cleaning both parts of the plug, but no change.
I'm hoping that if I can determine which cable to look for then I can stick a meter on it and start to trace the problem back?

Any other suggestions are more than welcome!

TIA

Chris

 

I'm not an expert , I just play one on the internet .

Fuse # 6 / 5 amp red driver side fuse box

Thanks , The Jaguar Whisper .

 

Thanks, will give that a try later and let you know

 

 

http://www.jagrepair.com/images/Auto.../jagxk1999.pdf

Working on someones alternator wiring now . Did a quick check earlier for the original reply . See figure 9.2 Center Console Switch Pack , fuse is the square 16 , fuse location figure 1.2 . You would have to pull up the other subsystems prints to verify if this is the shared fuse which I did not do .

 

 

Physically you would look for a unlocked wire pin or socket ( with a tug ) in the area of concern's connector . The color code is on page 14 although it can be hard to discern the actual color on the wire .

 

 

Still no luck...

i had it all apart today, down to the circuit board from the switch pack, and the connector block from the harness.

I could get each each of the LEDs to work by taking a live from the switches. So I know that they do I fact still illuminate.

Each LED has a separate wire coming in from the harness, but they all return to the same wire - no.9 on the block. So i have inspected both the wire in the block, and the route of LEDs on the board and can find no damage.

Short of trying a new switch console at £200+ I'm out of ideas?

 

Do you have power at the FC55-9 socket ( Brown / Red wire ) on the harness side . With multiple paths for that power to go through all those items can't fail at the same time so that points to the common denominator fuse and the wiring up to the connector . Might be fuse location error

 

 

Test the resistor with the connector off and will probably read about 200 ohms

 

 

Look like this ? A plain resistor would have worked on the original design in my opinion as there is not much of a voltage swing .

Suntan Varistor

or like this :

https://www.budgetronics.eu/index.ph...=18000&lang=EN

 

 

 

I do not think that part is your problem. You should solder it back in.

This is a varistor which is a protective device that is supposed to be open unless the voltage reaches 30V and then it becomes a near short circuit to protect the rest of the circuitry from voltage spikes. You are supposed to not see it conducting in normal use.

I suggest looking for a hairline break on the circuit board traces.

 

 

I expect if you trace how it is wired in on the circuit board it is parallel across the voltage source. You are describing it as if it is wired in series with the voltage source. It is expected to be open circuit in normal use and wired in parallel. When it sees an overvoltage only then it provides a temporary short.

 

Do you have a pic of the component side and circuit side of the area of concern and can reverse engineer it as the wiring guide only shows a classic circuit of a LED in the path of a ( classic current protection ) resistor . The dot is the tie in point for the other LED's