Question about 2000 Buick Park Avenue

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REAR DEFROSTER NOT WORKING 2000 BUICK PARK AVE

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Are you having problems with you PA rear defrost not working? I have the resolution. There is a relay/module that is behind the rear driver side pillar that fails. Actually, the connection between the module and connector burns out and I guess this is pretty typical.

All you need to do is remove the plastic covering above/between the drivers side rear door and rear window. Be patient in removing this as you may break a piece of hardware that reconnects it to body. Locate the black module on the pillar. You will notice and connector going into this module and going out of the module. Also, the antenna is also connected to this module. Look for the burned connector. I suggest you purchase these items online since it is cheaper as opposed to a dealership.

I suggest ordering part numbers:
Part Number 25623688
Part Number 15305949

Posted on Sep 01, 2012

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Hello,

First I would look for a blown fuse, do you have an indicator lamp that turns on when you push it? Dose the light come on? If not a fuse or relay will most likely be the problem.

If the rear "grid" on the defroster only works in some areas then you have a broken link, the grid needs to be connected for it to work.

Check your fuses & or relays, check your grid for broken links, you can buy a repair kit for the grid at most auto part stores.

Hope this helps.

Posted on Dec 29, 2010

  • markess50969
    markess50969 Apr 16, 2012

    The light comes on but the defroster does not work I checked the fuse and it is good but I can't find the relay.

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Posted on Jul 09, 2009

  • 15 Answers

SOURCE: Need wiring diagram for rear defroster.

The common problem with the rear defrost not working on a park ave is the antenna integration modules on the rear c-pillars. This is the way they make the rear defrost and antenna part of the same grid on the rear window. If your external mirrors are heating up, the rear window is getting juice too. They are fed from the same circuit. And yes, the relay does go in a particular way. Compare it to the position of the others nearby and insert with the same orientation.

Posted on Sep 15, 2009

  • 98 Answers

SOURCE: 1998 buick park ave. rear window defroster not working

Rear Defogger Inoperative, But Heated Mirrors Operate Correctly
1. Connect scan tool. Turn ignition switch to RUN position. Turn rear defogger on. Using scan tool, display BCM
outputs. If rear defogger is being requested on, go to next step. If rear defogger is not being requested on, go to
step 10).
2. Ensure ignition switch is in RUN position. Remove rear defogger relay from rear junction block, located on center
right rear of passenger compartment, under rear seat. Connect test light between ground and defogger relay
harness connector terminal F3 (Brown wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 11).
3. Connect test light between ground and defogger relay harness connector terminal A2 (Red wire). If test light
illuminates, go to next step. If test light does not illuminate, go to step 12).
4. Connect test light between defogger relay harness connector terminals A2 (Red wire) and B3 (Purple wire). If test
light illuminates, go to step 13). If light does not illuminate, go to next step.
5. Disconnect rear defogger positive and negative feed bus connectors. Connect a jumper wire between defogger
relay harness connector terminals F3 (Brown wire) and A4 (White wire). Connect test light between ground and
positive feed bus connector terminal "A" (Black wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 8).
6. Connect test light between positive feed bus connector terminal "A" (Black wire) and negative feed bus connector
terminal "B" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 9).
7. Repair open in Black wire between rear defogger and ground. Recheck system operation.
8. Repair open in Purple wire between rear junction block and heated backlight antenna module. Recheck system
operation.
9. Check for proper terminal contact at rear defogger connectors. Repair as necessary. Recheck system operation.
10. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.
11. Repair open in Brown wire between rear junction block and instrument panel junction block. Recheck system
operation.
12. Repair open in Red wire between rear junction block and underhood junction block (located in right front corner of
engine compartment, between battery and strut tower). Recheck system operation.
13. Connect test light between defogger relay harness connector terminals F3 (Brown wire) and A4 (White wire). If
test light illuminates, go to next step. If test light does not illuminate, go to step 16).
14. Reinstall defogger relay. Disconnect BCM 32-pin Pink connector C2. BCM is located behind right side of instrument
panel, near rear of glove box. Using DVOM, check voltage between ground and BCM harness connector C2
terminal A3 (White wire). If any voltage is present, go to next step. If no voltage is present, go to step 17).
15. Repair open or short to ground in White wire between rear junction block and BCM. Recheck system operation.
16. Check for poor connection at defogger relay terminals. If connections are okay, replace defogger relay. Recheck
system operation.
17. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.

Posted on Feb 25, 2010

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