Jumped in the 2006 XJR this morning and got the depress brake and apply parking brake message. Then cannot apply parking brake message. Parking brake is applied.
Scanned with iCarsoft and got C1785 and C1786. Did hard reset four times and even tried a trickle charger to see if low voltage is issue.
Weather May have something to do with issue. Have not driven after a hard rain a few days back, rotors have a coat of surface rust.
Found a couple threads for releasing EPB manually, but were for x350 and not a x356. Can buss is a little different.
Saw this issue when battery was weak, but it would clear after car ran a little. This is not battery related.
Anyone know how to release parking brake on a 2006+ XJ?

 

Well after reading more than 25 threads I know a little more than when I started. See DonB had this issue and just drove it with no parking brake. Bad sign for me.
Also cannot find the Electronic Parking Brake Module. That has been mentioned in several threads.
See that connecting DC to actuator should unlock the parking brake. Need to find the module. It is not is same place as 2004.

 

Also checked 30 amp fuse, (F32) and it is fine. Saw a post yesterday showing four fuses. Cannot find thread today.

 

If the parking brake is applied, your message should be cannot release parkbrake. I've seen both on my car, and until I put a new battery in I made a habit of not setting the parkbrake, by pressing the brake button down when I removed the key.

In situations where I got the message, and the yellow light on the dashboard, a reset by removing the battery terminals would clear it and give me normal function, for a while. If the car sat several days, though, it was back to cannot apply parkbrake (which would have been cannot release parkbrake if it had been set.)

After a new battery, this has never happened, so I'm not quite so confident as you about your "This is not battery related" statement.

The one time before battery replacement that I was out and about and the parkbrake set and wouldn't release, I moved the car slowly backward and forward a few feet at a time and the parkbrake popped free. The car drove normally, and I then had cannot set parkbrake, so the controller knew it was not applied.

 

I have experienced the weak battery, parking brake not releasing. Addressed by letting car run for a few minutes to recharge battery then restart and error and issue was gone.
My battery is fresh and voltage reads 12.6 volts. Put a trickle charger in it and let it run for 4-5 hours to see if there was a threshold. Have left car running for 30 minutes.
Still get the “apply brake and parking brake” message followed by “cannot apply parking brake” message. Maybe because it is applied.
Tried rocking it a bunch. Worried that may wear out the mirrors as they tilt up and down.
Pulled F32, hard reset electrical a half dozen times.
Hoping to find module and plug and unplug connectors. See if that helps. Then try battery voltage to try and manually back off EPB.
Glad this happened in driveway.

 

I did another hard reset this afternoon. Got the “apply foot brake and parking brake” message. But it the “cannot apply parking brake” message.
Depressed brake pedal and set parking brake. Released parking brake. Problem gone.
Will try to push down on release when shutting off the engine. Did not do it this afternoon. Too happy the issue is gone.
Will scan and clear C1785 and C1786 codes.
On to my next planned maintenance item, re o-ringing compressor.
This system can be very frustrating when major issues just come and go.

 

Pushing down on the button to prevent the brake from setting is not at shutoff, but when you remove the key.

 

[QUOTE=Panelhead;2626118
Will try to push down on release when shutting off the engine. Did not do it this afternoon. Too happy the issue is gone.
Will scan and clear C1785 and C1786 codes.
On to my next planned maintenance item, re o-ringing compressor.
This system can be very frustrating when major issues just come and go.[/QUOTE]

Thanks for clarifying how to prevent automatic operation of EPB.
I have never overrode the parking brake in the eight years of ownership. Will definitely start. But will be like an Auto Stop. Do not always remember to override.
Years ago I used to disconnect the positive battery terminal and then ground to chassis to do reset. Read that just disconnecting ground was proper technique. Tried it and it worked better. Not sure why.
This is the only car I have owned in over 50 years of driving that required periodic hard resets. My 2005 A8 which is just as complicated or more has never required reset in 10 years of ownership. The XJR a dozen times.

 

Hold it down while you remove the key, or it will still set

 

NEVER EVER EVER remove the positive terminal first, ALWAYS remove the ground terminal first. If your wrench were to touch the bodywork while you were on the bolt for the positive terminal you'd have a dead short through your wrench, with the FULL CURRENT CAPACITY of the battery!!

As for needing frequent resets to put things back in order... again, CLASSIC weak battery symptom. And by "weak," I mean maybe a tenth of a volt! I was resetting every couple of weeks, got tired of it, threw in a battery, and haven't had to do that reset for months now.

The battery in these is a big 'un, too, do not skimp. 900 CCA!

 

A week ago we had a good rain. And I did not push brake release while removing the key. Sat in driveway all week until whatever dried out. Embarrassing that car sits with parking brake locked.
Kept getting light rains.
Back on the road again now.
I think if I can find the leak it may solve some other minor issues.

 

cable puller motor has intermittent circuit faults it literally tells you that in hd 4k.

people tell you to keep doing goofy stuff like “hard” resets and my favorite the battery replacement salesmen who diag a bad one with a meter 😂😂😂😂😂. they just don’t understand how a car works.

 

so the cable puller motor is shorting out after a hard rain? I guess I can get a pull from scrapyard and try this.

 

it’s telling you diagnose the cable puller motor circuit. power probe, test light, fully loaded parts cannon whatever you want to do 🤷‍♂️

 

I will try your tips on troubleshooting this issue. But will start with the correlation between rain and the EPB failure. On a parked car it must be a new leak somewhere.
Expecting a hard rain tonight. Car is parked with parking brake turned off. If there is a failure with brake off it is not a game changer.

 

Your Parking brake module is located in the boot/trunk of your car. As you stand at the rear of your car looking forward it is behind the carpeted panel to your right, a couple of clips hold it in place, you will also have to take out the spare wheel base board. they are in one of 2 locations depending on the type of module you have. Older cars have long upright modules which is bolted behind the wheel arch cover, these sell for about very little second hand and are easy to pick up. If there is no module there, then it is located more towards the right rear tail light behind the rear electronics module, for some reasons these modules are 3 times the price of the older models.

Dont do hard resets with your batter terminals, just unplug the module.

You can by pass the module, or just replace it. I had this on my 2006 XJ 2.7, even after a new battery, I went through the car checked for anything electrical that wasnt working as it should, when I fixed my parking sensors and replaced an interior bulb the problem stopped.

I did cut a flap in the rear boot panel to make access to the module easier should it occur again

My experience is that there is not much inside to module to fail it is often just something that stops it from working as it should, most commonly voltage drops on start up from an electrical gismo thats now broken somewhere else on the car

 

Thank you! Got a gully washer Thursday night. Been scared to see if there is an issue now. EPB was off, hopefully if shorted it still is off.
Mine must be behind the rear electronics module. There is no EPB controller where the 2004 MY cars have it.
I will dig in that corner to see if it has sprung a water leak in the passenger side trunk area.
Problem seems to be resettable if the weather is warm and dry for several days.
Living on borrowed time right now.

 

http://www.jagrepair.com/images/TSB/...%20Vehicle.pdf

 

Hello all,
Have a 2006 X350L. I have experienced the parking brake staying on. I have attempted to hot wire the EPB motor.
I have successfully used this method on a 2004 X350.
When I went looking for the EPB module I was unable to locate it forward of the rear electronic module or behind the
rear electronic module. I have been looking for any wiring that has the 4 wires of red black brown green to lead me to the EPB module.
So far I am at a loss. Any suggestions or insights.

 

I gave up. Mine locked up a few times. After drying out would release, sometimes weeks later. Started depressing brake switch lever before turning off to prevent getting stuck on.