Hi
Like many I have a ACS/Trac Control error message on my 2001 XK8. It is likely the ABS module (the contacts that require re-soldering), but some suggested it could be dirty wheel speed sensors. I removed, cleaned, and reinstalled the front sensors. Now, in addition to still having the ACS/Trac light, I have a "incorrect part fitted" warning, and the speedometer does not work! I checked the contacts and all seems fine. I merely cleaned the sensors with some soap and water, scrubbed them a bit, was careful not to get any fluid in/on the contacts, nothing crazy (did not do the rear since it would involve removing the wheel and I was feeling lazy).

UPDATE: I just noticed that the odometer is also not working. It lights up but does not change as I drive..... Is this a sign of bad wheel speed sensors, or of something electronic, or what?

In addition I now also get the Low Brake Fluid warning. Needless to say the brake fluid is at or near Max.

I unhooked the battery for 10 minutes to see if that might reset everything. No resolution.

Engine compartment fuses seem ok.

Any idea on how to solves these electronic gremlins?
Thanks,
-Jonathan

 

Head over to jagrepair.com and locate the TSBs. There are a few that relate to failed solder joints on the instrument cluster and exhibits these symptoms. FWIW, if this is indeed your issue, these problems seem correctable with basic soldering skills.

Best of luck, keep us posted.

 

Thanks. I am hoping to avoid a trip to the shop since it will be loads of $$ for something likely rather simple.

 

As I noted in an edit to the original post, I noticed today that the odometer is no longer working. It lights up but does not change when I drive.

Is this a sign that the wheel speed sensors (or harnesses) are bad? Or could this also be related to the ABS module?

I opened up the ABS harness and found that one of the prongs is missing (#14, see photo).

Any advice??
JHS

 

Hi,
if you take a closer look to the inner connector you'll find that at least five or six of the pins are bent or buckled. Hard to believe that the female part of the connector is in good working order and gives current linkage to the following controller.
The missing pin No. 14 gives input from the Traction/Stability Control Switch (center console) to the ABS controller, which means that you should be unable to switch the traction control off. But this should not cause any issues.
Fritz

 

I'm afraid that a replacement ABS module is on your shopping list.

The bent pins can often be gently straightened, but the replacing the broken one will be a challenge.

 

Update: I was able to straighten the pins (ahem, the ones I bent in the first place by forcing the harness back!) and get the harness connected again. Even though one pin is broken it seems to have done the trick and we are back to status quo ante: ACS and TRAC warnings (as before) but no more Low Brake Fluid, Incorrect Part Fitted warnings, and best of all the speedometer and odometer are back.
Oddly enough my P1637 and P1646 codes disappeared, but I now have C1175 (rear wheel speed sensor). I can live with that.
I have an ABS module on the way and some replacement VSS's (they were a bit dodgy looking) so I am optimistic (for today)...
Thanks!

 

Jagrepair has a ton of details for this:

Check jagxk2001.pdf

The pinout is nicely described



Then, the actual schematics show the detail of the pinout:
Looks like Pin 14 is just the trac off switch. Pin broken means open circuit, seem to mean normal behavior with active traction control. In other words, you have seemingly lost the ability to turn trac off with this broken pin.

 

Thanks for this. Very helpful. My C1175 may be related to pins 21 and 22 being wonky.
At any rate my new controller module is on the way so this will allow me to motor around for now.
Thanks again.