Thread: Error code C1A96

I see C1A96-64 under ABS faults;

Brake Light Switch Plausibitity Fault

Check the Stop lamp Functions. Ensure brake lamp switch is correctly installed and configured.

Not sure if it helps, just happened to have the codes handy.

Quick google of the code suggests its a brake system code. Main ideas seem to suggest checking your brake lights as a blown bulb can cause it - some suggesting you need genuine LR bulbs to make it happy again, also check the brake pedal has returned to the correct position/switch reseated by giving the pedal a "firm" pull back as it may have just not returned correctly after de-pressing.

Hope that helps.

Haha too slow of me! Good to see we have both suggested the same thing though.

Thanks guys. I have got a fault code unit. Funny thing was I was getting a transmission fault, suspension lowered, no sports or command shift, seemed to have all gears though.
C1a96 is the only fault that was showing.???
Cheers

It's probably the brake light had gone and the element has shorted onto the tail light element. for some reason this has been known to affect the suspension...A weird computer glitch.

Originally Posted by Jamo

It's probably the brake light had gone and the element has shorted onto the tail light element. for some reason this has been known to affect the suspension...A weird computer glitch.

The link below is to my Gallery file section on disco3 where I have put some files related to the brake light circuits. One of the files is the brake wiring diagram.

If one looks closely, you can see how the brake lights are tied to the ABS module and more interestingly, the reverse lights via a common ground within the tail light fixture assembly. As a result of that common ground, then back to the transmission via a reverse gear relay; also the brake light power feeds back, (or not), to a hill decent relay which tends to explain why we get a HDC failure message when all it is is something to do with the brake circuit.

If one still has the original LR brake light switch installed, (the blue and white thing in the attached pdf), it would probably be a good idea to install the newer FOMOCO updated switch. It costs about twenty dollars and is actually fairly easy to replace, (even the first time).

DISCO3.CO.UK Photo Gallery - Brake Light Switch Replacement

I had a look this morning, although it was very (insert expletive) cold (relatively speaking bbyer ;-), hope you have a comfy chesterfield).

Brake lights functional. Got it to recur once only. I only had a quick look at the earths. If that were the problem then perhaps would I be seeing other faults as well? If the brake switch is intermittently faulty then this only symptom I will see?

Its great having a brains trust!

Update.

I removed the brake light switch, disassembled, cleaned and got another 600kms out of it before failing again. I assume that the black powder from the shaft wear was sticking to the lubricant on the contacts causing the "comparison failure". The replacement switch arrived in the meantime and I have just refitted. I will provide a final update after a few more kms.