brake lights, turn signals not working when headlights are on

Asked by Jun 21, 2017 at 07:20 AM about the 2003 Chevrolet Suburban 1500 4WD

Question type: Maintenance & Repair

Initially noticed that the turn signal indicators on the dash came on when
braking and both turn signals rapidly flashed when signaling while braking.  
Replaced the hazard warning and turn signal module but the problem
persisted.  Replaced the towing and brake wiring harnesses.  Removed and
replaced all light bulbs, checked wiring and connections from the dash back.  
Replaced both interior and engine fuse boxes.  Pulled the dash and checked
brake and signal connectors.

Only thing I haven't replaced is the BCM and the main computer and the
problem persists.  No problems with stereo, other dash components, problems
engine starting or performance so I don't think the BCM or PCM would be the

At this point, everything works until the running lights or headlights come on
and then the problem returns.  No brake lights, all turn signs begin to rapidly
flash no matter which direction I am turning.  Love the truck but am out of
ideas.  Suggestions???

No answers yet

Your Answer

Chevrolet Suburban Experts

  • #1
    Andrew Olsen
  • #2
    Neal Turner
  • #2
    Eric Fritz
View All

Related Models For Sale

Used GMC Yukon XL
8 Great Deals out of 503 listings starting at $2,800
Used Chevrolet Tahoe
5 Great Deals out of 639 listings starting at $6,871
Used GMC Yukon
11 Great Deals out of 866 listings starting at $5,950
Used Ford Expedition
14 Great Deals out of 360 listings starting at $2,995
Used Cadillac Escalade ESV
153 listings starting at $8,950
Used Chevrolet Silverado 1500
173 Great Deals out of 10,673 listings starting at $2,500
Used Cadillac Escalade
4 Great Deals out of 378 listings starting at $4,980
Used Chevrolet Silverado 2500HD
10 Great Deals out of 804 listings starting at $5,995
Used Toyota Sequoia
5 Great Deals out of 85 listings starting at $3,150
Used Ford F-150
451 Great Deals out of 9,038 listings starting at $922
Used Lincoln Navigator
93 listings starting at $7,888
Used Nissan Armada
4 Great Deals out of 164 listings starting at $4,999
Used Ford Explorer
45 Great Deals out of 1,353 listings starting at $3,900
Used Dodge Durango
53 Great Deals out of 1,012 listings starting at $2,998

Used Cars For Sale

2017 Chevrolet Suburban For Sale
273 listings starting at $52,900
2016 Chevrolet Suburban For Sale
29 listings starting at $44,000
2015 Chevrolet Suburban For Sale
25 listings starting at $42,967
2014 Chevrolet Suburban For Sale
6 listings starting at $25,999
2013 Chevrolet Suburban For Sale
11 listings starting at $27,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.