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A/C and electrical issues

Tiny
DERTY
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 3.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
While I’m driving an have my A/C on all of the lights on my dashboard come on, all of my gauges go down except for speedometer. While that is happening? My A/C stops blowing cold and I can’t let my windows up or down! But when the gauges move back into there place everything starts back working! What is the problem? Any suggestions?
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Tuesday, July 9th, 2019 AT 7:24 PM

14 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

When the AC is off, does any of this happen?

Can you upload a video of what happens?

Roy
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Wednesday, July 10th, 2019 AT 7:37 AM
Tiny
DERTY
  • MEMBER
  • 8 POSTS
Okay.
Video (Click to make bigger)
Thumb
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Thursday, July 11th, 2019 AT 2:29 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, again, does the truck work normal when the AC is not on?

Roy
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Thursday, July 11th, 2019 AT 2:31 PM
Tiny
DERTY
  • MEMBER
  • 8 POSTS
Yes.
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Thursday, July 11th, 2019 AT 3:13 PM
Tiny
DERTY
  • MEMBER
  • 8 POSTS
It still drives fine.
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Thursday, July 11th, 2019 AT 3:13 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay. The only thing they have in common is the body control module.

Can you monitor that with your scan tool?

Roy
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Thursday, July 11th, 2019 AT 3:22 PM
Tiny
DERTY
  • MEMBER
  • 8 POSTS
I don’t have one.
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Thursday, July 11th, 2019 AT 3:38 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
At this point, you need a scan tool to see what the BCM is doing. It may have corrupted software and need to be reprogrammed.

Roy
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Thursday, July 11th, 2019 AT 3:40 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I see you responded but nothing came through.

Roy
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Thursday, July 11th, 2019 AT 3:47 PM
Tiny
DERTY
  • MEMBER
  • 8 POSTS
I don’t have a tool to do that. Can they do it at AutoZone?
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Thursday, July 11th, 2019 AT 3:55 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You would have to call and check. It depends on the store what scan tool they use.

Roy
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Thursday, July 11th, 2019 AT 4:03 PM
Tiny
DERTY
  • MEMBER
  • 8 POSTS
Okay, and what scan tool should they have?
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Thursday, July 11th, 2019 AT 4:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Something that will read the body control module live data.

Roy
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Thursday, July 11th, 2019 AT 4:32 PM

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