Thread: D4 Fault Diagnosis IID Tool

Actually come to think of it, if it's the light sensor circuit, i'm probably looking in the wrong place there too. Might not be a bulb, but the sensor?

Russ.I doubt its the fob,it doesn't connect with the can bus system by wire.You will have a wiring fault within the antennas/loom for the fob by the looks of it.
I helped a CAT mechanic find a wiring problem on my grader that was in the can bus.He located the loom via the faults,then had me watch the laptop whilst he manipulated the wires of the loom.He found the exact break fairly quickly,all I had to do was tell him when the fault changed from active to inactive as displayed on his laptop.
Once you locate the loom that is throwing the fault simply get an observer to waych your Idtool whilst you massage the wires.
GOODLUCK
Andrew

My guess is a loose earth for the KVM and light sensor modules.

Does keyless entry work at all?

Originally Posted by LandyAndy

Russ.I doubt its the fob,it doesn't connect with the can bus system by wire.You will have a wiring fault within the antennas/loom for the fob by the looks of it.
I helped a CAT mechanic find a wiring problem on my grader that was in the can bus.He located the loom via the faults,then had me watch the laptop whilst he manipulated the wires of the loom.He found the exact break fairly quickly,all I had to do was tell him when the fault changed from active to inactive as displayed on his laptop.
Once you locate the loom that is throwing the fault simply get an observer to waych your Idtool whilst you massage the wires.
GOODLUCK
Andrew

Ah damnit, this is going to be potentially problematic.

Thanks Andy, will have a prod around on the weekend. Might have the dig up a wiring loom diagram.

voltage out of range.
Can be a faulty earth too.
Andrew

The KVM has 2 earth connections to different studs so might half work.

To start with I would look up all the earth points involved on that loom.It should be on the wiring diagrams.
Andrew

Originally Posted by Graeme

My guess is a loose earth for the KVM and light sensor modules.

Does keyless entry work at all?

Thanks, I'll definetely start there.

Keyless does still work. Accept for on the key I put through the washing machine the other day ahem lucky it was a $50 Ebay key...