Question about 2007 Cadillac STS V Sedan

1 Answer

I recently had electrical (wire harness replacelement) work done @ my dealership to repair/replace the touch-release for the trunk, on my 2007 STSV Cadillac. Now when I turn off the ignition there is an audible "click" sound, coming from the rear of my car. I would like to know if I should be concerned over this new noise? Thanks!

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  • bryonp484 Apr 06, 2011

    Yes, a bit louder than door locks when I put in drive and reach the mimimun speed to auto-lock the doors. The sound is only heard after I park and shut off the ignition button(keyless ignition). This sound was not heard before the recent work performed, and sometimes there is "no click" so very difficult for my technician as he still has not been able to get this possible malfuntion to happen when I take the car into my dealership. Very frustrating - if this is going to cause problems down the road when no warranty thus my plea for help. Thanks!

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Is the clicking sound really loud? Does the sound only happen once when you turn the ignition off?

Posted on Apr 05, 2011

  • 2 more comments 
  • Kelly Comstock
    Kelly Comstock Apr 05, 2011

    Do you still need help?

  • Kelly Comstock
    Kelly Comstock Apr 06, 2011

    Well I think it may be doing something its not normally supposed to do. I think the lock is just activating. I would imagine it to be annoying but everything should be ok.i wouldnt worry about anything happening.just keep occasionally taking it to your guy when you can and eventually he will hear it and fix it right up for you.
    Sorry about the blunt sentences I am using my phone because my 15 month old son broke my modem tonight. Let me know if you have any more questions,i am heart to help. If not would you be willing to mark the question as solved and rate the solution? I have too many questions in my que and it wont let me take on anymore.

    Thank you and let me know if you need anything else :)

  • Kelly Comstock
    Kelly Comstock Apr 06, 2011

    Oh i didnt notice the part where you mentioned that you have no warrenty. Do you get charged every time you take in in just have the mechanic hear the noise?

  • Kelly Comstock
    Kelly Comstock Apr 06, 2011

    They should not be charging you since they were the ones who have caused this noise when doing the prior work. I think they have possibly installed the component wrong. Like i said before though, I think that it is just the lock engaging or disengaging, and should posed no type of problems that will affect the cars drivability.

    Remember, If you need anything else I am here to help :)

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1 Answer

My trunk will not open. When I take off battery cable and replace, it opens once. Is there an easy fix? relay etc?


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.
  3. ?‡'
    If the resistance is not within the specified range, replace the trunk relay.

  4. Test for infinite resistance between the following terminals:
  5. ?€¢
    30 and 86


    ?€¢
    30 and 87


    ?€¢
    30 and 85


    ?€¢
    85 and 87


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

  6. 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.
  3. ?‡'
    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.

  4. Verify that a test lamp illuminates between the switch side B+ circuit of the trunk relay and ground.
  5. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

  6. Disconnect the harness connector at the rear compartment lid latch.
  7. Ignition OFF, test for less than 5 ohm of resistance between the rear compartment lid latch ground circuit and ground.
  8. ?‡'
    If greater than the specifed range, test the ground circuit for an open/high resistance.

  9. Connect a test lamp between the trunk release relay control circuit and the coil side B+ circuit of the trunk relay.
  10. Command the trunk release solenoid ON and OFF with a scan tool.
  11. ?‡'
    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.

  12. Connect the harness connector at the rear compartment lid latch.
  13. 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.
  14. ?‡'
    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.

  15. 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.
  3. ?‡'
    If less than infinite resistance, replace the rear compartment lid release switch.

  4. 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.
  5. ?‡'
    If greater than 2 ohms, replace the rear compartment lid release switch.

  6. 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 !

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Second, before any parts are purchaced, the actual CAUSE of the problem needs to be verified. Unfortunately, the ONLY way to do that is to get the trunk lid open and inspect the trunk lid latch components. If none of the three methods provided by the manufacturer for opening the trunk in a normal fashion will work, the trunk will have to be accessed by removing the back seat. Once the back seat is removed, a technician can reach into the trunk and remove the bolts that secure the trunk latch to get the trunk open. The latch parts can then be accessed to disassemble, inspect, and repair accordingly.

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1 Answer

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