Dear Forum,

I have a 1-7 flashing airbag warning; I understand this to be passenger spatial position sensor? Attached is a scan; ignore the 1 of 13 top right...I had a battery failure and I have now cleared 12 of those codes...This one remains B2291. I am assuming that 30 ohms is a fault simply because it seems out of line with the others?

Please, where should I look for this poor ground? Under the passenger seat? A black wire? Will it visibly be going to a ground stud under there? Will I have to remove the passenger seat to find it?

Thank you.

 

From the schematic it appears you are looking for grounding points G7, G12 and or G13.

 

Thanks Mark,
Yes, I think it is G13; however I have no idea what I am looking for under that seat. Mess of wires and very little access. Looks to me like I must remove the seat?
Need to get Torx socket for front bolts.

 

Yes, I picked up some a year ago to pull the seats out of the X-Type......haven't had to delve under the front seats of the XJ yet.
Good luck with the hunt and let us know how you get on.

 

Mark,
My center console (touchscreen etc) is suddenly taking some considerable time to come on when cold starting? Could this help me to narrow my search for the faulty ground, please?
Code B2291 shows CR87 -17-18 and that appears (I could easily be wrong) to indicate G7?

 

The Telematics display is grounded via G15, which is just on the other side of the centre console from G7.
I can't immediately see any tie up with shared grounds or supplies between with the restraints system and touch screen display.....sorry.

The occupancy sensing module is under the seat and it receives inputs from the spacial sensors (passenger A pillar, head liner (two sensors there) and the centre console, along with the passenger weight module also under the seat, that is interpreting the passenger weight sensor and seat belt tension sensor.

I think you will be needing to gain access under the passenger seat to check all these connectors for any ingress or tainted contacts.
Check the earth point under the seat.
Also have a think whether the headliner, centre console or passenger's A pillar have been disturbed that might have pinched or damaged a spacial sensor wire.

Sorry that I can't be of much help, but you did give me a bit of a laugh when you referred to a "cold start" fault of your touchscreen....in Dubai no less...your cold start would probably be a warm summer day here

Something that just came to mind re. your touch screen.
Is it just the screen backlight not starting up immediately. If you shine a torch onto the screen, do you see the information displayed there even when the screen is effectively looking dark and is the touchscreen still active?
Can you you still change screen modes or access audio settings before the screen comes backup to normal viewing behavior?

 

Hello Mark,
Thank you...I see your point regarding a cold start in Dubai!
To clarify, the console only delays to come on when first started; if I switch off, then back on again, no problem. When delayed, nothing functions. I have recently fitted a bluetooth car adapter with hidden wiring into my rear entertainment console (LWB car); perhaps that is interferring with both the position sensing and/or the telematics? Or maybe I disturbed a ground up under the glove box fitting it?
Anyhow, I have ordered the female Torx set to remove the passenger seat and I will revert when done.
Again, thanks...

 

Hello Mark,
Given the 30 ohm resistance at the 'Air Bag Bracket Ground' shown in post #1 and the code B2291, whereabouts in this pic should I be looking please?
I have no idea whatsoever!

 

Hi
guess you need to look for wires leading away from the seat itself possibly under the seat

and under the carpet. If it is a bolt in the floor then it is understandable that it could corrode.

 

I also have an airbag light on at the moment. Now I have had this before. Code is B2295 and the flash code and the reader tells me it is the drivers side airbag which is the one high up in the seat side bolster. When I had this before I checked all the grounds, under the seat and the one behind the radio where the restraints module is located. This is the bracket ground that is shown to be 30 Ohms in your readout. The problem turned out to be the the airbag connector which is located within the seat bolster. This connector is actually located so that if you bash the seat bolster when you get in the seat you can disturb the connector. I had to remove part of the seat cover to get to the connector cleaned with contact cleaner and all was well again. The code has re-appeared (5 years later!) after a very large tester at the MOT station squeezed into the seat, disturbing the connector again.
Anyway, I have recently read the live data from my restraints module and the resistance of the ground bracket is shown to be 40 Ohms (yours was 30 Ohms). This is the same as it was when I had my first airbag code 22 which ended up being the airbag connector. My point is I don't think this is your problem, as I think 30-40 Ohms is normal for this. I would check all the connectors for the passenger occupancy sensors to the occupancy module and from the occupancy module to the restraints module. Attached is a document describing the whole system for your information.
Good luck, getting these things sorted is a matter of persistence as much as anything.
This is my journey with code 22 back in 2018;
https://www.jaguarforums.com/forum/x...e-22-a-202062/
I'm going to have to go back to that bolster airbag connector!!

 

Here's a Jaguar TSB which might also help diagnosis of your problem;

 

Thanks Meirion1, I'll take a look when I get back

 

Thanks Paddyx350,
Now I will at least be able to recognise which is the occupancy sensor module; so grounds thanks to Meirion1 and modules thanks to you!

 

Curiously, if I switch on my ignition, the air bag warning does it's 1-7; but if I then switch off and back on again, it goes away and stays off?

 

Well, both my airbag warning light and my Telematics display have curious symptons. The airbag light consistently has a 1-7 warning when I switch on and start my engine; however, if I switch on to posiion 2, then switch off, then back on again to start the engine, it consistently clears?
My Telematics is blank and non-functional when I start my car, but comes on and functions perfectly normally after a variable delay?
I have checked both grounds and they are sound?
Any Auto Electricians have ideas of what I should try next, please?

 

If you look on page 13 of the Jag TSB I sent it has all the potential causes of a flash code 17, with the relevant DTC and PID code, If you have someone with access to a suitable diagnostics tool you could whittle down the specific cause of your code. It does not look like a problem with the air bag bracket ground resistance. I would put my money on a connector in the wiring harness playing up. The relevant connectors and harnesses are listed in the TSB for each DTC/PID code. To identify the connectors/wiring harnesses and their location you need to look through the X350 electrical guide which has all the wiring diagrams for this system. The X350 electrical guide is available somewhere on this website but attached is the copy I have.
I would work through all the connectors, locate them, disconnect, clean with contact cleaner and reconnect. Its a tedious process, and you will have to remove bits of trim to get to some of them, but that's what I did and it solved my problem (flash code 22, until it re-appeared again a couple of weeks ago after a 5 year absence!)