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Parking brake fault

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Old 06-13-2018, 06:20 AM
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Default Parking brake fault

i have a parking brake fault error message showing on the dash and I have tried resetting the parking brake to no avail. I have used SDD to read the codes and originally it was showing just one code C1799. But now, having cleared to code a few times and it coming back again, it now appears that there is no code! The parking brake model passes the test with no DTCs at all even though the parking brake still doesnít work (it shows a message ďparking brake faultĒ in orange with the orange brake warning light when stationary and ďCannot Apply Parking BrakeĒ in red with the flashing red brake warning light and orange brake warning light when the vehicle is in motion. Operating the parking brake switch does nothing. So it appears that there is definitely a fault but there is no DTC recorded! Any ideas? Thanks.
 
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Old 06-13-2018, 09:01 AM
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I would try disconnecting the battery, and then doing the parking brake reset.
 
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Old 06-13-2018, 09:20 AM
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Originally Posted by Bigg Will View Post
I would try disconnecting the battery, and then doing the parking brake reset.
Thanks for your suggestion, but you must have missed the bit in my post that says ďand I have tried resetting the parking brake to no availĒ 😊
 
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Old 06-13-2018, 03:06 PM
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Originally Posted by Colin21958 View Post


Thanks for your suggestion, but you must have missed the bit in my post that says ďand I have tried resetting the parking brake to no availĒ 😊
I just saw you reset it, I didn't know if it was a reset at the faults request, or due to your doing a battery disconnect.
Well the manual says there are 2 micro switches 1 for apply and 1 for release, and a hall effect sensor "inside the actuator" to ensure a full release of the brakes. The good thing is the Jag can tell you if and, which switch or sensor is bad, but you need a higher level (Dealer level) scanner to see that info. You could try an independent brake specialist. The higher lever scanner I use just came out with their XF parking brake diagnostic program for $50, guess I'll be getting it.
 
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Old 06-13-2018, 04:54 PM
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Originally Posted by Bigg Will View Post
I just saw you reset it, I didn't know if it was a reset at the faults request, or due to your doing a battery disconnect.
Well the manual says there are 2 micro switches 1 for apply and 1 for release, and a hall effect sensor "inside the actuator" to ensure a full release of the brakes. The good thing is the Jag can tell you if and, which switch or sensor is bad, but you need a higher level (Dealer level) scanner to see that info. You could try an independent brake specialist. The higher lever scanner I use just came out with their XF parking brake diagnostic program for $50, guess I'll be getting it.
when it was showing a code read through SDD it was C1799 (Hall Effect Sendor Circuit Fault). But now itís not showing any code at all, even though the fault still exists!
 
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Old 07-07-2018, 06:31 AM
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I have tried replacing the parking brake actuator with a secondhand unit which I am assured was working on the donor car, and still have exactly the same problem. Still the same code comes up C1799, intermittently, but the fault is still exactly as stated previously. I have run the parking brake module test routine and it seems to pass that without any DTCs being produced. So now I am a little stumped! Any suggestions anyone?
 
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Old 07-07-2018, 09:26 AM
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Does anyone have the pinpoint testing information to investigate the C1799 DTC please. I have a wiring diagram and can trace the wires to check continuity, etc., but Iím assuming there is also voltage/resistance readings to test for as well and this information is not in the service/electrical repair manuals. Can anyone help with this data please?
 
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Old 07-07-2018, 10:12 AM
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It's probably the same as the car yours is based on (S-Type) and is detailed in the chassis codes pdf. I'm doubtful they'd provide yet more info.

edit: I see it's also in the XF workshop manual (looks very much like the S-Type).
 

Last edited by JagV8; 07-07-2018 at 10:15 AM.
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Old 07-07-2018, 10:32 AM
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Originally Posted by JagV8 View Post
It's probably the same as the car yours is based on (S-Type) and is detailed in the chassis codes pdf. I'm doubtful they'd provide yet more info.

edit: I see it's also in the XF workshop manual (looks very much like the S-Type).
Thank you for your reply.

I donít see this information anywhere in the XF manual. Can you tell me where in there it is? I know there is a diagnostic table but when it comes to testing it doesnít provide data like this.

Where can I find the Chassis Codes.pdf for the S-type which you mentioned? I did a search but couldnít find it anywhere.

I appreciate your help. 😊
 
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Old 07-07-2018, 02:07 PM
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JTIS is on here / JagRepair.com - Jaguar Repair Information Resource
Hilton Camons

(I just used google...)
 
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Old 07-07-2018, 03:03 PM
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Thanks, Iíll check it out.
 
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Old 07-09-2018, 04:21 AM
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Originally Posted by JagV8 View Post
JTIS is on here / JagRepair.com - Jaguar Repair Information Resource
Hilton Camons

(I just used google...)
I have now investigated the links you provided, but there is little information available there on either the XF or S-Type and definitely no information i havenít already got. I already have the full service manual, electrical manual and JLR SDD, but it seems the only way to get the actual pinpoint testing information and data is through a Topix Subscription; I tried to subscribe but there appears to be a fault with their website which prevented me from registering, I have also contacted them about this but got no reply.

So i was just wondering whether anyone might have done pinpoint tests on the Park brake system on the XF. and therefore might have the information I need. There was a technical bulletin for the S-Type, but without translating the references between the two manuals that is not much use. However, if I canít find the information any other way, I guess thatís what I will have to do.
 
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Old 07-12-2018, 10:47 AM
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I have found and rectified the fault. It was a high resistance in the wire between the Hall effect sensor (the signal wire) and the module. The point where the high resistance was located was somewhere under the car where it was quite inaccessible, so I by passed the whole wire with a new cable from the module to the actuator. So, if you get this sort of problem be sure to check the continuity of the wiring!
 
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Old 07-13-2018, 12:01 PM
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Originally Posted by Colin21958 View Post
I have found and rectified the fault. It was a high resistance in the wire between the Hall effect sensor (the signal wire) and the module. The point where the high resistance was located was somewhere under the car where it was quite inaccessible, so I by passed the whole wire with a new cable from the module to the actuator. So, if you get this sort of problem be sure to check the continuity of the wiring!
Congrats! Those are the hardest types of failures to find. I am sure a dealer would have taken forever and have changed out just about everything in the car before finding it.
 
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Old 07-13-2018, 01:55 PM
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Originally Posted by lotusespritse View Post
Congrats! Those are the hardest types of failures to find. I am sure a dealer would have taken forever and have changed out just about everything in the car before finding it.
Thank you and Yes, Iím sure youíre right! 😊👍
 
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