Rear trunk release button not working
#1
Rear trunk release button not working
I needed to change the trunk lid on my 96 xj6. The wiring was not a big deal but the trunk release button is not working. The replacement trunk had a bad actuator which I replaced with the one from the original lid. Now the trunk lock works when I push the dash panel switch and my fob. The trunk lights work as well as the plate lights. The original switch from the lid was damaged.
I have some questions. What does that small micro switch do that is on the locking mechanism? The push button switch on the lid, is this just a momentary on-off switch? How is this momentary switch wired. What else can the problem be.
I have some questions. What does that small micro switch do that is on the locking mechanism? The push button switch on the lid, is this just a momentary on-off switch? How is this momentary switch wired. What else can the problem be.
#2
Join Date: Oct 2013
Location: Twin Waters, Sunshine Coast, QLD. Australia.
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G’day Jomo,
The small micro switch on the latch, through the BPM (body processor module), controls the trunk/boot lights and enables/disables the remote locking/unlocking.
The problem with the boot/trunk release button is more than likely a broken wire in the loom near the RHS boot/trunk hinge, it’s a common problem.
Cheers,
Jeff.
The small micro switch on the latch, through the BPM (body processor module), controls the trunk/boot lights and enables/disables the remote locking/unlocking.
The problem with the boot/trunk release button is more than likely a broken wire in the loom near the RHS boot/trunk hinge, it’s a common problem.
Cheers,
Jeff.
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jomo (02-16-2020)
#3
#4
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Location: Twin Waters, Sunshine Coast, QLD. Australia.
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G’day Jomo,
The button is just a momentary contact push button switch.
All the wiring for anything in the trunk lid goes past the RHS hinge, I’d be checking there for a broken wire or maybe you could unplug the button switch and short the contacts and see what happens. It may be that the push button switch is faulty. Spray it full of contact cleaner and work it a few times and try it again.
Cheers,
Jeff.
The button is just a momentary contact push button switch.
All the wiring for anything in the trunk lid goes past the RHS hinge, I’d be checking there for a broken wire or maybe you could unplug the button switch and short the contacts and see what happens. It may be that the push button switch is faulty. Spray it full of contact cleaner and work it a few times and try it again.
Cheers,
Jeff.
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jomo (02-16-2020)
#5
Jeff,
Tomorrow I will go by the switch and short out the two wires. If that does not do the trick, then I will go by the hinge and short out the two wires. If the trunk unlocks (I'll close it by hand with the lid open), then I will find the break in the wire. Knowing that it is just a momentary switch is very helpful.
Thanks,
Jomo
Tomorrow I will go by the switch and short out the two wires. If that does not do the trick, then I will go by the hinge and short out the two wires. If the trunk unlocks (I'll close it by hand with the lid open), then I will find the break in the wire. Knowing that it is just a momentary switch is very helpful.
Thanks,
Jomo
#7
I tested the switch today. When I disconnect the plug from the trunk lid switch and shorted out the terminal the lock, which I locked by hand, opened up fine. I did this a few times. For some reason I locked the lock again by hand and when I put the plug back in the lock unlock. That was surprising. I then locked the lock and the button did not work. I disconnected the plug and when I reconnected it the locked open. I then concluded that the switch is not good. The button itself is moving in and out very nicely so I am sure that there is a short inside that switch somewhere. I will remove it tomorrow and see if I can get it going. Fortunately I have a continuity meter.
Anyone have any advice on how to fix the switch?
Thanks,
Jomo
Anyone have any advice on how to fix the switch?
Thanks,
Jomo
Last edited by jomo; 02-14-2020 at 09:19 AM.
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#8
Sorry to keep going on about the hinge wiring, but the problem might still be there.
When you were testing it sounds like you had the boot open and it worked. The wire might not be completely broken, and might make contact when the lid is in a certain position, but not when lid is shut.
It might be the switch, but for every one switch fault there are 100 hinge wire faults!
Good luck,
When you were testing it sounds like you had the boot open and it worked. The wire might not be completely broken, and might make contact when the lid is in a certain position, but not when lid is shut.
It might be the switch, but for every one switch fault there are 100 hinge wire faults!
Good luck,
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jomo (02-16-2020)
#9
Thanks for going on about the hinge. I don't mind that at all. Please confirm my reasoning that it is not the wiring at the hinge.
If the button switch is not being pushed in then when I connect the plug then the lock should not open. The thing is that the lock is opening every time I connect the plug to the switch. I am assuming that when the plug is not connected then there is no continuity between the two wires in that plug. But when I connect the plug there is continuity because the lock opens and this means that the switch is in the closed position all the time. Does this sound 100% valid to you?
Alternatively I can check the continuity at the switch when I get some time. In fact because of your insistence that it might not be the switch I will do that!
Jomo
If the button switch is not being pushed in then when I connect the plug then the lock should not open. The thing is that the lock is opening every time I connect the plug to the switch. I am assuming that when the plug is not connected then there is no continuity between the two wires in that plug. But when I connect the plug there is continuity because the lock opens and this means that the switch is in the closed position all the time. Does this sound 100% valid to you?
Alternatively I can check the continuity at the switch when I get some time. In fact because of your insistence that it might not be the switch I will do that!
Jomo
#11
#12
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jomo (02-16-2020)
#13
Or if at fault a good second hand one is not to expensive https://www.ebay.com/itm/Jaguar-XJ6-...-/124066218514
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jomo (02-16-2020)
#15
Yes I agree with @countyjag that it's almost certainly the switch.
Replacement is straightforward.
1. Remove the boot plinth from the car, then remove the 2 screws that hold the switch unit to the plinth. Mine were very, very rusty and had to be drilled out.
2. Drill out the rivets that hold the micro switch in the unit, and cut the cables attached to the old switch
3. Solder the old cables to the new micro switch, and insulate as best you can. I used heatshrink. The switch needs to be NO (Normally Open), and be a momentary switch (not locking). My new switch was multi function (both NO and NC depending on terminals) so make sure if yours is that you use the correct terminals - test with a meter before soldering.
4. Attach the new micro switch to the original switch unit with small screws and nuts. Use thread locker to ensure they won't come loose. Install the repaired switch unit back on the plinth. Job done.
Replacement is straightforward.
1. Remove the boot plinth from the car, then remove the 2 screws that hold the switch unit to the plinth. Mine were very, very rusty and had to be drilled out.
2. Drill out the rivets that hold the micro switch in the unit, and cut the cables attached to the old switch
3. Solder the old cables to the new micro switch, and insulate as best you can. I used heatshrink. The switch needs to be NO (Normally Open), and be a momentary switch (not locking). My new switch was multi function (both NO and NC depending on terminals) so make sure if yours is that you use the correct terminals - test with a meter before soldering.
4. Attach the new micro switch to the original switch unit with small screws and nuts. Use thread locker to ensure they won't come loose. Install the repaired switch unit back on the plinth. Job done.
Last edited by b1mcp; 02-15-2020 at 07:23 PM.
#17
#18
#19
Trunk Won’t ‘Remember’
I ordered from eBay one from Poland. To be aware, my card was processed in Luxenberg but eBay has buyer protection so not too worried.
Has anyone run across your trunk that was adjusted to a less than full opening and no matter how many times you reset it it always goes back to the lower setting? I’m wondering if that could’ve been done at a dealership and an override the default fully opening because maybe someone had the opposite problem opening all the way and they were hitting the trunk lid or something.
Has anyone run across your trunk that was adjusted to a less than full opening and no matter how many times you reset it it always goes back to the lower setting? I’m wondering if that could’ve been done at a dealership and an override the default fully opening because maybe someone had the opposite problem opening all the way and they were hitting the trunk lid or something.
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