One of 2 things you either have a bad switch or trunk actuator. I would replace switch
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.
SOURCE: 2004 cts cadillac trunk will not open with remote
if you here a clicking sound when you push the remote or the drivers button then the solenoid and fuse are probably o.k. lubricate the trunk lid catch and operate the latch a few times, also check the tension on the trunk itself , it should lift up part of the way by itself, if not 1. lubricate the hinges and move trunk lid up and down. if still bad 2. if it has a tension rod adjust the rod to a stronger setting if it has gas shocks, 3.replace shocks. if no click and fuse is good solenoid may be bad
SOURCE: 2004 cts cadillac trunk will not open with remote
Check fuse.. Test for power to trunk release solenoid. When door button, or remote trunk release button is pushed. If there is power ( use a 12 volt test light ) most probably faulty release . Hope this helps
SOURCE: Where is oil filter located on 2008 Cadillac CTS 6
The Location of the oil filter depends on which engine you have in your CTS. the 3.2 engine the oil filter is located on the bottom of the engine to the left of the oil pan. It is not a screw on type filter it is a canister filter. You will have to unscrew the lid to gain access to the oil filter. On the 3.6 Engine the oil filter is also a canister filter but it is located on the top side of the engine. On the drivers side around the center of the engine cover. It will take a 15/16 socket to remove the lid.
SOURCE: 2008 CTS - Key fob doesn't always open the doors
The battery may need replacing. I've experience the same problem and the battery was the problem. Good luck. Ned
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