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You can fold either side of the rear seatback down for more cargo space.
To lower the rear seatback, follow these steps:
Open the trunk and pull one or both of the small handles located in the center of the trunk.
Once the handle is pulled, the seatback can be pushed open through the trunk, or pulled open from the inside of the vehicle.
Sorry ,but you need the trunk open ! What's wrong with your's ? loose your key . trunk release inside the vehicle doesn't work .
Your best bet , have a qualified repair shop check it out . May have DTC'S diagnostic trouble codes stored .
DTC B3267: Trunk Release Output Circuit Low
DTC B3268: Trunk Release Output Circuit High
The rear compartment release circuit consists of the following:
• The intergrated body control module (IBCM) fuse
• The rear compartment lid release relay
• The rear compartment lid lock release actuator
• The rear compartment lid release switch
• The cargo lamp/trunk ajar switch
The rear compartment release circuit operates as follows. Battery positive voltage is applied at all times to the rear compartment lid release relay. The rear compartment lid release relay is energized by either depressing the rear compartment lid release switch, or when the IBCM receives a rear compartment release signal from a key fob. The IBCM then provides a path to ground on the rear compartment lid release relay control circuit, energizing the rear compartment lid release relay. When the rear compartment lid release relay is energized, battery positive voltage is supplied to the rear compartment lid lock release actuator causing the actuator to energize releasing the rear compartment lid. The rear compartment may be released with the dash mounted rear compartment release switch. The ignition must be in the OFF or ACCESSORY positions for the rear compartment to be released with a keyless entry transmitter fob (RFA). The rear compartment may also be released by an OnStar commanded using RFA functionality.
Luggage Compartment Description and Operation (Sedan)
Rear Compartment Lid Release
The rear compartment lid can be released in one of three ways:
• Inserting the key into the key lock cylinder, if equipped
• Operating the rear compartment lid release switch
• Using the keyless entry fob
To operate rear compartment lid with the rear compartment lid release switch or with the rear compartment release button on the key fob, the gear selector may be in any position, but vehicle speed must equal 0 for the rear compartment lid to release.
When the rear compartment lid release switch is pushed, the rear compartment lid release signal circuit to the body control module (BCM) is grounded. BCM then grounds the coil side of the trunk release relay through the trunk release relay control circuit. With this voltage is applied to the rear compartment lid release actuator, opening the rear compartment.
do you know how to do electrical testing ?
Ignition ON, observe the scan tool Trunk Release Switch parameter while pressing and releasing the rear compartment lid release switch. The parameter should change between Active and Inactive.
? If the parameter does not change, refer to Trunk Release Switch Malfunction.
Command the trunk release with a scan tool, the rear compartment lid latch should release the trunk lid.
? If the rear compartment lid latch does not release, refer to Rear Compartment Lid Latch Malfunction
I'm not sure what you're definition of trunk latch is so let's cover all the bases.
The trunk latch mechanism is inside the trunk well. When you open the truck lid, look down, right in the middle of the back lip that you would have to lift things over to put them in the trunk. The latch mechanism is right there in the middle. While you are looking in the location, look just to the left as you are standing behind the vehicle, and you will see a handle kind of like the pull handle on the end of the cord for your walk behind mower. That is a glow in the dark, emergency pull release for the trunk latch. If you or a child ever got caught in the trunk for some reason, you can pull that handle to manually operate the trunk latch to allow you to open the trunk lid.
On your key FOB, you have a trunk release button as well. If you push that button twice within 5 seconds, the trunk latch will release. You also have a trunk release button to the left of the steering wheel. It's a round button with a picture of a car with an open trunk lid. You can push that to open the trunk lid as well. To use the button inside the car, or the one on the key FOB, the car must have the transmission in park. It will not release the trunk latch if the vehicle is in gear.
Lower the back seat and crawl into the trunk and see what the latch is doing when you activate the key fob. the trunk lid will have to be open to enable any repairs. Also an emergency release cable is probably visible (yellow handle) inside the trunk and will Open the trunk lid.
sounds like it could be the latch mechanism is seized(rare but does happen) and you could try forcing the trunk lid open while using the remote button at the same time and it may pop open,other wise the release motor is not working properly(motor making noise but not moving),you should get a trunk key made just for this type of reason(any thing electrical or electronic will fail).otherwise you will have to access to the trunk some how to repair the problem.
You can try this I think the latch is just slightly missaligned.Did you put something in the trunk and push down on the trunk?Try to push down hard on the trunk where the latch is a few times while pressing the remote.If this works and it opens look for marks on the latch indicating rubing,file down,spray with WD 40.Good Luck.