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This is very complex if your not familiar with how Class 2 serial data communications work . When you press that trunk lid release button it sends a low voltage signal to the BCM - body control module. Here is how the factory service info. says how it works .
When the vehicle is in park and the trunk release switch is pressed it grounds the rear compartment lid release switch input in the Body Control Module (BCM). The BCM then sends a Class 2 message to the Remote Function Actuator (RFA). The RFA supplies an internal ground for the coil side of the rear compartment lid release relay activating the relay. The rear compartment lid release actuator receives battery voltage through the 15 A trunk release fuse when the relay closes. Ground is supplied by G400.
Your best bet is to take your vehicle to a dealer or some other qualified repair shop that has a factory scan tool or a professional grade type .
You could check the TRK/REL relay in the rear fuse/ relay box .Because you can't test the class 2 data to the rear integrated module.
Fuse Block Rear
Under the left side of the rear passenger compartment seat
Pull the release straps located in the trunk. The right strap operates the passenger's side rear split seat. The left strap operates the driver's side rear split seat. Fold the seatback down from the inside of the vehicle
Does Lumina sedan have rear seat pass thru to trunk ?? if sedan then a pull tab will be in seat upholstery near shelf / by rear window . pull it crawl in with Light Plus friend on outside to hand tools .. IF VAN must remove interior panels to gain access .. Try small thin needle nose pliers to pick broken KEY Piece out of lock 1 ST . if successful spray in Lubricant before trying another key . BUT must be reason lock jammed -- Frozen by weather change or Mechanism Disconnected due to lack of lubrication or worse Plastic Parts used in assembly by Factory .. DRILLING Lock Out will get it Open but new / used parts to repair are now on your shopping list ..
someone moved the switch in the or should i say on the trunk lock itself to disable the trunk release from inside, SO...
Bottom of seat where your Butt goes, Has to be pushed hard to the rear bumber from the front on both side driver and passenger in the rear to disengage the rear catch then the rear seat comes up,
Next you should see 2 screws at the bottom of the back rest remove them and lift the back out, then your going to need a long screw driver or extensions for ratchet to unbolt the lock from the inside and that should be that,? Have fun.
YES. Crawl into the back and remove all of the screws that hold the back plastic panel on.
the back seat is removed by pulling up the rear seat front cushion. Then you get access to the seat back. There are 2 12 mm bolts that hold the seat back AND the side arm rest.Lower arm rest bolts are at the bottom. 12 mm. Tie the seat belts back. The seat back bolts are at the bottom. 12 mm.
B-4 you try that ordeal...... Use lock eaze on the lock cylinder. Graphite spray can.
Try pulling the trunk key back out. maybe a slide hammer.. Put down pressure on the trunk lid,first. Have a friend sit on it...
WD-40: last resort.
Work the key in the cylinder after you dowse the key hole with that crap/chemical. If the key brakes off,into the trunk you go.
You have listed the vehicle is a 1987 Jaguar XJ6. The trunk is not electronic and only unlocks with the key as well as both the gas doors. Any issues here then it is your key or the actual trunk latch. If you do have a 1988 model year then the trunk lock has 3 positions. locked all the time, unlocked all the time or the vertical position locks and unlocks with the vehicles drivers door lock. If the trunk button (paddle) is loose and moves but nothing happens then the inside rod has come loose and you will have to manually operate the latch by removing the license plate and taking a long screw driver through the lower plastic bungs. The fuel flap is a separate unite and does have a manual release but you need to open the trunk to get to it. If the fuel flap stays locked all the time then the actually filler neck module will need replacing.If you have a 1997 which has the electronic release button to open the trunk (95-2003) Then you will need to firstly lock all door and unlock the drivers door 2 times. Check the fuel flap is now released, if not then the fuel flap actuator located on the filler neck inside the trunk is bad. If the trunk does not open with the remote, inside car switch and trunk mounted switch then the passenger side trunk harness is broken. Open the trunk with the key and on the right(passenger) hinge there is a grey plastic cover, remove that cover and carefully peel back the wiring harness cover and you will find 1 or more broken wires. Once the wires are repaired then I recommend you zip tie them in place and retest the trunk release button.If this does not answer any of your questions please feel free to email email@example.com