Trunk release unable to open trunk lid using trunk release

Have you got the valet switch turned on?

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 .
Luggage Compartment
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.

Do you know anything about automotive electronic's ? The trunk release is controlled by electronic control modules . Having the vehicle check for DTC'S - diagnostic trouble code's should be the first step in the diagnostic procedure . Then reading how it work's !
Factory service repair info.
Rear Compartment Lid Release System Components
• Body control module (BCM)
• Remote control door lock receiver
• Interior rear compartment lid release switch
• Exterior rear compartment lid release switch
• Rear compartment lid release actuator
• Trunk release relay

Rear Compartment Lid Release Operation
The interior rear compartment lid release switch receives a signal from the driver door switch assembly (DDSA). When the interior rear compartment lid release switch is activated, the signal circuit is pulled to ground. The DDSA interprets this and sends a GMLAN serial data message to the body control module (BCM) requesting the rear compartment lid be released. The BCM responds by applying battery voltage to the trunk release relay control circuit which energizes the TRUNK RELES relay. The trunk release relay is supplied with battery voltage at all times. With the relay coil energized, the relay switch contacts close allowing battery voltage to flow to the rear compartment lid release actuator causing the rear compartment lid to release. The rear compartment lid release actuator is permanently grounded at G402.

The trunk release relay is located in the rear fuse box located under the back seat.

The rear compartment lid release system consists of the following components:
• Body control module (BCM)
• Folding top cover actuator
• GMLAN serial data link
• Keyless entry transmitter
• Rear compartment lid ajar switch
• Rear compartment lid release actuator
• Rear compartment lid release switch
• Remote control door lock receiver (RCDLR)
• Trunk fuses
• Trunk release relay

Rear Compartment Lid Release System Operation
The rear compartment lid can be released by operating the rear compartment lid release switch or pressing the rear compartment lid release button on the keyless entry transmitter. When the rear compartment lid release switch is operated, the rear compartment lid release switch signal circuit to the body control module (BCM) is switched to ground. The BCM receives the rear compartment lid release switch input and applies ground to the trunk release relay control circuit. This energizes the trunk release relay coil, closing the switch side contacts, allowing battery voltage to be applied to the rear compartment lid release actuator and folding top cover actuator, releasing the buttresses and opening the rear compartment lid. Ground for the rear compartment lid release switch is provided at G300. The rear compartment lid ajar switch, rear compartment lid release actuator, and folding top cover actuator are provided ground at G301. The rear compartment lid will not release until the vehicle speed is zero and in park.

Do you know what DTC'S - diagnostic trouble codes are ?
DTC B3265 01 : Trunk Relay Output Short to Battery
DTC B3265 06 : Trunk Relay Output Short to Ground or Open

Do you know what a relay is an how it works ? TRUNK release relay located in the underhood fuse / relay box.
VEHICLE RELAYS Operation Diagnosis

Hi Jeff,
I was going to say, check fuse/ jump the load side of relay Good post.

How about a key ?

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 ?

Circuit/System Verification
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

You may want to take it to a repair shop .

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.
Rear Compartment Lid Release Relay

1. Ignition OFF, disconnect the trunk relay.
2. Test for 65-90 ohms of resistance between terminals 85 and 86.
?‡'
If the resistance is not within the specified range, replace the trunk relay.

3. Test for infinite resistance between the following terminals:
?€¢
30 and 86



?€¢
30 and 87



?€¢
30 and 85



?€¢
85 and 87



?‡'
If less than infinite resistance, replace the relay.


4. Install a 10-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Measure for less than 2 ohms of resistance between terminals 30 and 87.

?‡'
If greater than 2 ohms, replace the relay.

Rear Compartment Lid Release Relay Malfunction

1. Ignition OFF, disconnect the trunk relay.
2. Verify that a test lamp illuminates between the coil side B+ circuit of the trunk relay and ground.
?‡'
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the voltage control circuit for a short to ground. If the circuit tests normal, test or replace the trunk relay.

3. Verify that a test lamp illuminates between the switch side B+ circuit of the trunk relay and ground.
?‡'
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Disconnect the harness connector at the rear compartment lid latch.
5. Ignition OFF, test for less than 5 ohm of resistance between the rear compartment lid latch ground circuit and ground.
?‡'
If greater than the specifed range, test the ground circuit for an open/high resistance.

6. Connect a test lamp between the trunk release relay control circuit and the coil side B+ circuit of the trunk relay.
7. Command the trunk release solenoid ON and OFF with a scan tool.
?‡'
If the test lamp remains ON all the time, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.



?‡'
If the test lamp remains OFF all the time, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.


8. Connect the harness connector at the rear compartment lid latch.
9. Connect a 3-amp fused jumper wire between the switch side B+ circuit of the trunk relay and the voltage control circuit of the lid latch. Verify that the lid latch activates.
?‡'
If the lid latch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid latch.

10. If all circuits test normal, test or replace the trunk relay.

Component Testing
Rear Compartment Lid Release Switch

1. Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
2. Test for infinite resistance between the trunk release switch supply voltage and ground terminals with the switch in the open position.
?‡'
If less than infinite resistance, replace the rear compartment lid release switch.

3. Test for less than 2 ohms of resistance between the trunk release switch supply voltage and ground terminals with the switch in the closed position.
?‡'
If greater than 2 ohms, replace the rear compartment lid release switch.

4. Test for infinite resistance between each terminal and the lid release switch housing/case.

?‡'
If less than infinite resistance, replace the rear compartment lid release switch.

Could be the relay , could be the switch , could be a problem with the BCM !

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.

There is a valet switch in he center console and make sure it is switched on so it will open. Does it open from trunk switch on the trunk or from the manual key cylindr in the trunk deck lid? If it does not work from the manual key release on the deck lid then the lock in the trunk is faulty and will need to be drilled and removed unless your a lucky one and have the ski boot opening in the center of backseat fold down arm rest ? If there is a opening then use a hanger and grab the emergency release handle at the right rear of the trunk deck lid underneath, it is glow in the dark colored.

TRUNK LID ELECTRIC LATCH NOT WORKING MORE LIKELY ITS BROKEN.YOU HAVE TO USE KEY THE OPEN THE TRUNK LID, IF TRUNK LID GETTING POWER, THE ELECTRIC LATCH HAS TO BE REPLACED.