My buddy and I just replaced the trunk lid struts in my '95 XJ6 and after that, I now have this odd beeping ‘alarm’ going off after I remove the key from the ignition--listen to the video attached.

It is not the alarm from the transmission not being in park. If I put the key in the ignition while it’s beeping and turn to accessory or on position, it stops. The car starts fine every time. I can drive the car no problem. Sound emits from under the passenger side dashboard (US car).

What is this?

 

I don't believe the trunk strut job was related. We did remove a multi-pin connector above the fuel tank that has a slide lock mechanism to get the harness out of the way but we put it back on and locked it in again. No other cables were removed. I can't imagine this is related but this is what we touched so including it here in case the info helps.

 

The removal of the key makes a linier switch make in the ignition switch ( otherwise they are rotary )

This would be pin 4 to 5 of the ignition switch connector , no need to remove switch just yet

So you have that at least changing state , what it triggers ( pin 4 directly to SLCM ) is the security lock control module and from there ..................................

In tinkering in the trunk lid there is a common fault of insulation stripped on the wires under the cover of the curved right trunk hinge , this contains the wires for the trunk lock position agreement to the SLCM that it is secure on Ig switch key removal

The chirp you hear is the system in the security section of this video

 

Aha, we did repair the trunk lock wires from that loom which had broken as they usually do. I will go back and check we don't have a short on any of those. If you have other guidance on what to look for please let me know.

 

This connector as the BT - 4 connector above the fuel tank ?

It can be tricky to reinstall correctly without breaking the lock pins , was a tie wrap on it as normal to hold lock bar over ?

There is some layers of sheet metal cutout that interfere from halves coming together

 

Need wiring schematic for the new ride ?

 

Yes that is it and yes the zip tie was on it. I will inspect this again to make sure we didn't damage it.

 

The trick is to not try too hard but wiggle in a around motion to overcome the sheet metal cutout edges

 

The alarm may be from the Air Bag ECU. Does your SRS Air Bag warning light work? It should come on with Ignition and go off after 6 seconds.






If there is a fault with the Air Bag system AND the Air Bag Warning light is faulty, the the ECU will emit 5 consecutive beeps as a warning. It will re-issue the warning every 30 mins while driving the car and when it is turned off. The Air Bag ECU is behind the passenger side dashboard.

 

The plot thickens. Yes my airbag system is faulted, it's just one of those systems I have yet to address, but I have been driving it for almost a year with the airbag fault condition and haven't had any beeps to date in almost 8k miles of use. The sound is coming from exactly the location you suggest. This started after we repaired the trunk wires (I should have led with that in my initial post, sorry). So it seems these actions would be related? Is there a condition where bringing the trunk switch back online would activate something in the airbag system?

EDIT: My airbag light does come on and stay on, so I don't believe there is a fault on the warning light. However, this system is now suspect. I will monitor for repeated beeps every 30 mins and report back.

 

Brendan is the expert on the airbags and has produced an excellent PDF on that X300 specific system

Seams lately from reading others a common thing is a special fuse inside the blue airbag module ( " safer " named thermo fuse , cheap on amazon )

" Is there a condition where bringing the trunk switch back online would activate something in the airbag system ? "

I would say no

See Brendan's PDF as attached file at the very bottom

 

I have confirmed the beeps return after 30 mins so it seems we are dealing with the airbag ECU. I have had Brendan's PDF downloaded for some time so now I have a forcing function to put it to use! So very odd that the alarm would start sounding now. If anyone has theories as to why now after repairing trunk wiring I'd be curious to know. FWIW, I disconnected the trunk release button just to see if that made any difference and it did not.

Brendan, Parker, thank you so much for your knowledge and quick replies. I'll report back on my findings.

 

Coincidence , but you have an airbag history

I believe there is a dedicated trunk lock position switch with it's own wires , but a side distraction from core work

 

Normal operation of the light is that it should stay on for 6 seconds (after ign on) then go out. If there's a SRS system fault it should come on again after another 2 seconds and then stay on.

If it really does stay on after ign on then that's a faulty light circuit.


Can't think of anything in boot hinge wiring that could be associated.

 

See page 157 for trunk lock position switch , but then a distraction

jagrepair.com/images/AutoRepairPhotos/jagxj1995.pdf

The lock position switch ( or trunk closed ? ) is on the top left shoulder in this pic



GNA9500AB valid part # for X300


Item # 8 is not a switch but a white threaded nylon barrel , Actuator # 5 , does it contain a position switch ? but then a path not needed to go down ?

2 wire to drive the actuator

Jaguar XJ6 Trunk Latch, Striker, Lock Actuator switch fits 1995-1997 x300 | eBay

 

If it comes down to airbag module thermo fuse , maybe order ahead of time ?

The fuse is the yellow rocket cone item

A salvaged sourced whole module may have this fuse already blown

Airbag Control module thermal fuse - Jaguar Forums - Jaguar Enthusiasts Forum

Brendan's note in that thread :

" Make sure you have tested and eliminated any faults before replacing the fuse / control module - or the fuse will blow immediately and back to square one. "

This video from someone will be for a right hand steering model with no glove box

 

NTE8167 Thermal Cut-Off Fuse Axial Lead 169 Degree Celsius 15 Amp | eBay

$ 4.00 shipping from Virginia

 

Hi All, some updates on my diagnosis. We followed Brendan's guide through all the tests. No change when installing the jumpers so we moved onto testing the module:
- Ohms too high on the left and right crash sensors (saw 5.3 ohms, expecting less than 2)
- 0 volts on all pins related to the safing sensor
- Ohms to high (6) at the module ground

First order of business was to remove the ground and inspect. Interesting that Jag seems to have used a coated bolt for this. It had a reasonable amount of chalkiness for it's age so we cleaned it and sanded the part of the body that it connects to. That helped get the ohms to a normal range.

Anticipating needing a new module, I got one from ebay ahead of time. Looking inside, the ebay donor was in great shape. On my original, the big fuse block was torched. We suspect the ground issue may have lead to the fuse failing. When we swapped the module, the SRS light stayed off and no more alarm beeping. We reconnected the airbags one at a time testing with the key on and the light remained off. However, after putting all the interior bits back together, the next time we turned the key on the SRS was back after the 6 second cycle. Sigh.

This week I will retest with the jumpers because we may not have waited the correct amount of time for the long internal test to complete. Hypothesis is we have an issue in the airbags or clockspring. I'll send a progress report after that. Thank you to everyone who guided us thus far and big thanks to Brendon for that amazing diagnostic manual.

 

The airbag light ( SRS ) may not come on until 3 fault events ( ? ) , but then the module does a self test on engine start that may negate this

Your quick check may be before a cycle is counted to rid airbag light

This " dampening " may play havoc with your trouble shooting logic / steps after a change

Or may be no dampening as a " C " code for chassis and the common " P " codes list the dampening parameters like cycles and velocity for anti - lock brakes

You saw the thermo safer fuse as not roasted as fuse housing not tarnished ?

It's kind of in the territory " while there " , cheap at least , the donor car may have been in a crash blowing the fuse

The crash sensors as little black boxes are between the 2 front headlight pairs ( yellow wire harness ) in the elements , may be a connector clean

Brendan ?

 

New update: I ran errands today, started the car three times and the SRS light hasn't come on at all today and no airbag warning in the cluster. So that's super curious. Wonder what tomorrow will bring? Lol.