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2002 Rear Defroster problem

 
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billy101
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Location: Willow Spring, NC

2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Fri Nov 25, 2011 12:23 am    Post subject:  2002 Rear Defroster problem Reply with quote

Hi all...getting settled into my newly acquired 2002 Impala LS 3.8. Loving it, especially with the rebuilt transmission. One thing I'm finding I'm having an issue with is the rear defroster. It doesn't work. The side mirrors heat up fine, so I'm guessing it's something to do with something in the back. The contacts seem secure on the rear window too. Any help is appreciated..it gets cold in the mornings and the rear defroster is nice to have.


EDIT: From what I've found on AllDataPro is


Rear Window Defogger Description and Operation

Rear Window Defogger System Components

The rear window defogger system consist of the following components:

HVAC control module
Body control module (BCM)
REAR DEFOG relay
Rear window defogger grid
Rear Window Defogger Operation

Battery positive voltage is supplied to the REAR DEFOG relay switched input. With the engine running, the BCM supplies battery positive voltage to REAR DEFOG relay coil. When you depress the rear window defogger switch, the HVAC control module illuminates the rear window defogger indicator and grounds the control circuit of the REAR DEFOG relay. This energizes the REAR DEFOG relay and allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the REAR DEFOG circuit breaker to the rear window defogger grid. Ground for the rear window defogger is provided by G309.

When you start the engine and press the rear window defogger switch for the first time, the defogger cycle lasts for 15 minutes. Further operation results in 7.5 minute defogger cycles. The defogger cycle resets to 15 minutes when you cycle the ignition to the OFF position and then back to the ON position.

If battery voltage is low, the BCM will disable the rear window defogger by removing the battery positive voltage supplied to the REAR DEFOG relay coil.


Ground G309 is on the right rear C-Pillar. I'll check and make sure that ground is OK, if it's good...idk where to go from there out. I'll check the module that is on the C-Pillar as well.

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2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
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bigdog60
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2005 Chevrolet Impala


PostPosted: Fri Nov 25, 2011 1:56 pm    Post subject:   Reply with quote

I would check the glass with a ohm meter to see if there are any broken lines.
Then check to see if 12 Volts is coming to it when the switch is on
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billy101
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Location: Willow Spring, NC

2001 Chevrolet Impala
2010 Chevrolet Malibu


PostPosted: Fri Nov 25, 2011 2:41 pm    Post subject:   Reply with quote

bigdog60 wrote:
I would check the glass with a ohm meter to see if there are any broken lines.
Then check to see if 12 Volts is coming to it when the switch is on


There are no broken lines, ohm'd them all out. Replaced the relay, and now the rear defroster works, but the driver side of the rear heats up and defogs noticeably faster than the passenger side. Is there a fix for that?

_________________
2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
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jmlock
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2009 Chevrolet Impala


PostPosted: Sat Nov 26, 2011 12:08 pm    Post subject:   Reply with quote

The one on my '09 sucks. It gets power and all the grid lines are intact, but it doesn't work worth a crap.

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2009 9C1 (in-service 'take-home')
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