Got the 'Parking Brake Fault' today. It seems to come and go along with the 'Cannot Apply Parking Brake' fault. One of them is always present but never both at the same time. Tried charging the battery and doing a battery reset, but no help.

So I 'interrogated the module' and got:
C1799 - Hall effect circuit failure
C1802 - Motor engage current not reached or traveled too far upon apply
U0101 - Lost communication with transmission control module
U0155 - Lost communication with instrument cluster control unit

I get the U0101 every now and then but don't think its relevant to this.

Reading the data from the module, it looks like the parking brake switch works fine. Only failure i see is 'EPB failure management mode 7 - Actuator position fault'

Here are the failure modes for the 2 relevant codes:



Next move is to visually inspect the cables and calipers.

I sprayed some WD-40 on the sway bar bushings the other day and I'm thinking some of it got on the Actuator connector since its right there. Getting to the connector is harder than getting to those bushings so I might be screwed if the connector is fouled up.

Any suggestions?

 

Also could be low power (tired battery etc).

 

I don't think I've used my parking brake in 4 decades. I had a 1980 Trans Am and applied the parking brake. It stuck and was a PIA to resolve. Have not touched one since. Scared.

 

Every Jag I've owned has had parking brake problems. My x-type had seized up, twice! Even after 're-built' ones were installed. With mechanical parking brakes, its "use it, or lose it". The more you use them, the less likely they are to sieze.

As for the XKR, removed + inspected calipers, nil findings. Inspected cables, nil findings. Seem to move freely. When I restarted the car, I could hear and then confirm that the brake engaged. Then I could hear and confirm that it disengaged. But the fault still returned. So mechanically, everything seems good, even the actuator.

I could get a good line of sight and even got my hand up to the connector from the bottom of the car. Next step is to inspect the connectors as the only code showing now is C1799.

These seem to be the 2 suspect connectors CV001 and CV007 (Insert James Bond 007 joke here)

I can get to CV007 but gotta try and find CV001


Will update after I check them out.

 

I know from my experience when I replaced all my bushings, that the connectors are extremely hard to get pushed back together properly. If you disconnected any of them or was working around them, you could have easily knocked one loose that wasn't properly connected. Long story short I would make certain that all connectors are firmly pushed together and when I say firmly I mean I had to use a pair of channel locks to push a couple of them together...

 

So i inspected and cleaned out the connectors CV005 and CV 007. Reset battery and still the fault persists.





Now i'm getting desperate. I guess I will have a look at the connector at the module and the module itself. Then maybe pin point tests between the connectors. Ugh what a pain.

After that I will be a loss. Guess i'll have to take it to the dealer =[

 

I think you're right - next time I have the rear wheels off, I will double check. When I was replacing the sway bar bushings (attempting), I did move the cables and brackets around.

As for the module, I popped it out to visually inspect. Couldn't find any signs of corrosion or shorts. I guess it has to be the actuator or the cable routing.

Taking the module out is easy work for a contortionist... plenty of cramps and awkward positions and it only took like an hour to remove!

Some advise... undo the positive battery cable from the fuse box post, release the 4 clips that hold the wiring harness to the fuse box bracket, then remove the 2 nuts holding the fuse box to the bracket. Then you can reposition the fuse box and remove the bracket easily to get to the parking brake module.

Here are some pics of the module. No visible damage.




Can anyone confirm this is an OEM module? I don't see the Jag logo like all the other ones.

After I put it back in and turned the car on, did the park brake initiation thing, the fault came back =[

 

Matches mine, apart from the part indicating S-Type/your model.

 

Did you find a solution?

I'm having a similar problem. Car was at a specialist for corner balance. When I collected the car, they noted the error message.

I've tried disconnecting the battery, running diag in SDD, manual ran the EPB via SDD with no issue, cleared DTCs, pulled the fuse, etc and the error will not go away nor can I operate it without SDD.

 

Sorry, I need to ask, Did you follow the procedure for the Park Brake Reset? Did I miss that above?

"If the battery has been discharged or disconnected, the message APPLY FOOT AND PARK BRAKE will be displayed when the ignition is next switched on.
Depress the foot brake and apply the parking brake. This is required to reset the parking brake system. The parking brake will now function correctly."

I have had that error "Parking Brake Fault" display a few times. For me it's one of the clues that it's time to reset the system. Following battery reconnect one of the systems that needs resetting is the brake.
Now I can't seem to find an explicit statement in the xk manual. For my other Jaguars, the parking brake is automatically applied when the car is in Park. Now that I think about it, Is is not with the xk series?

 

Yes that has been done, the message centre actually prompts you to do that but it makes no difference and continues to state park brake fault.

I never use it but I dislike error messages. I suppose I could try setting the CCF to park brake not fitted and see what happens.

 

An SDD fix perhaps? Sorry, just read your previous messages.

Looking forward to the solution, too.
​​​​@jahummer , I blame you. I decided to have a look at the owner's manual and completely forgot about this:

• To familiarise yourself with the feel of the brake pedal during ABS braking, practise an emergency stop prcedure, always making sure it is safe to do so. With the seat belts fitted to all occupants, drive the vehicle at 32 km/h (20 mph) and brake sharply.
  
  

Some things just make me laugh out loud.

 

Are you getting any codes?

I've narrowed the issue down to the actuator itself. But I don't have the equipment or patience to replace it. I may have the dealer look at it along with another issue I'm having.

However the cable routing is important also - if the brake cables were moved around, it could give the fault.

 

Nothing was moved or changed. There were and are no EPB specific DTCs. There was one related to a flat battery. The battery was fine when it was left at the shop. It was around 12v when I collected it. While driving it there were a few other message centre errors regarding cruise not available, PATS and AFS. TSD also blacked out a couple of times. I let the battery charge for a couple of days and it is back up to the high 13v range but the EPB fault remains.

 

BTW, where is the fuse you speak of? I haven't checked that....

If you're not even getting a C1799 code then I'm not sure what the problem is. Can you probe the module like I did in Post #1 to see what specific failure you're getting?

FYI ... here are 2 PDFs that may help:
https://f01.justanswer.com/GAutoTech...B_Bulletin.pdf
http://www.jagrepair.com/images/TSB/...ng%20Brake.pdf

 

Also, how thin are your e-brake pads? Mine are pretty low. I may try replacing them, re-calibrating, and seeing what happens.

 

Fuse F8 5 amp fuse box #3 footwell. Pads are fine. I’m probably going to try deleting the EPB in CCF and see if the error goes away. If that works and If a solution comes up I’ll try that or I may just remove the calipers and actuator from the car to save further weight.

 

If you do remove the actuator, please document.

I'll post back when I replace the pads.

 

Well that did not work...set park brake control module from fitted to not fitted. Car went through upload and reset procedure but when done car asked to reset EPB and when I did the fault message returned.

 

Don't want to get my hopes up, but I noticed one of the parking cables is broken.

Wondering how to fix this without replacing the whole cable, or seizing the cable. The other one is on there nice and tight.


Also noticed uneven wear on the pads. Definitely going to replace these now.