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Latch for what ? trunk lid ? Door ? The power door locks an the trunk lid are controlled by a electronic module . The luggage compartment lid release switch is a input to the driver door module . The driver door module sends a message over serial data network to the trunk module . If you know nothing about automotive electronics , your best bet would be to take to a qualified repair shop.
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.
At the driver side junction box (DSJB), check the 10A FUEL OPN fuse which is the source of power for the fuel door. The power is applied to the fuel lid opener switch that, when closed, activates the fuel lid opener motor and...POP!
Also at the DSJB, check the 15A ECU-IG fuse which supplies power to BODY ECU 1. At the passenger side junction block, check the 20A P FR DOOR fuse. Next, at engine room relay block 1, check the 10A MPX-B fuse. These three fuses apply to BODY ECU 1 which controls luggage compartment door operation. TSW output from the ECU is applied to the luggage compartment dooe opener switch which, when closed, activates the luggage compartment door opener motor and...POP!
I can't promise it, but in my 99 A4 there is a release cable in the trunk. I have to pull the trunk carpeting away on the side where the gas filler door is, and there's a red cable there that can be used as a manual release. I imagine your TT has one as well - look in the hatch on the side with the gas door, and pull the lining back - you'll probably have a release cable as well.
You will either find an emergency release inside the trunk behind the liner, or the release lever will twist allowing the gas lid to spring open. You will then need to figure out the reason that the swith doesn't work.