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Dave Nova
Dave Nova, Buick Technician
Category: Buick
Satisfied Customers: 1808
Experience:  ASE Master Certification. GM World Class Certification
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Lesabre, 2005. The trunk ajar signal keeps sounding. nothing

Customer Question

lesabre, 2005. The trunk ajar signal keeps sounding.
JA: What exactly is happening to the trunk?
Customer: nothing the trunk is closed and secured.
JA: Are you fixing your LeSabre yourself? What have you tried so far?
Customer: yes.
JA: Anything else you want the mechanic to know before I connect you?
Customer: I replace the trunk latch wit a used latch.
Submitted: 4 months ago.
Category: Buick
Expert:  Jared D replied 4 months ago.

Hi,

To clarify, you already replaced the trunk latch and the light is still on?

Customer: replied 4 months ago.
the alarm is sounding
Expert:  Jared D replied 4 months ago.

Ok. Do you have a scan tool that will monitor the trunk ajar signal?

Customer: replied 4 months ago.
no
Expert:  Jared D replied 4 months ago.

Do you have a multi-meter to do some electrical testing?

Customer: replied 4 months ago.
Expert:  Jared D replied 4 months ago.

So the red with black stripe wire at the trunk latch should have ground when the trunk is open and then be open when the trunk is shut. So if you unplug the latch connector it should turn the indicator light off. If it doesn't then it means the red with black wire is shorted to ground somewhere between the latch and the rear integration module. Trace the wire as far as you can go and check for signs of rubbing though where the wire is contacting ground.

Expert:  Jared D replied 4 months ago.

Next, unplug the connector for the rear integration module and check for ground at the B3 pin in the trunk open and trunk closed positions.

Customer: replied 4 months ago.
will do. Where will I find the rear integration module?
Expert:  Jared D replied 4 months ago.

It should be right behind the rear seat on the driver's side.