LT1/LT4 Tech 1993-1997

Brake light on

Thread Tools
 
Search this Thread
 
  #11  
Old 11-04-2010, 01:10 PM
Luz Hernandez's Avatar
In the Staging Lanes
Thread Starter
Join Date: Oct 2010
Posts: 43
Default

Ok, new issue, i took the car to advance auto parts to get the service engine light checked, and i was told that their machine was not recognizing my car, that the plug was not getting any power??? I checked the fuses and theyre all fine, any suggestions?
 
  #12  
Old 11-04-2010, 01:12 PM
Luz Hernandez's Avatar
In the Staging Lanes
Thread Starter
Join Date: Oct 2010
Posts: 43
Default

In colorado they do test your car even when the service engine light is on, i think they started doing that in 2003
 
  #13  
Old 11-04-2010, 01:24 PM
Camaro 69's Avatar
Senior Moderator
January 2010 ROTM Winner
Join Date: Oct 2007
Location: The 'Burbs of Chicago
Posts: 18,306
Default

Here, they won't even look at the car if any diagnostic light is on. Doesn't matter much anyway, as the car wouldn't pass emissions because of why the light is on.
You sure you checked all the fuses (pulled and looked at em), like the one for the cig. lighter/power outlet?
 
  #14  
Old 11-04-2010, 01:52 PM
Luz Hernandez's Avatar
In the Staging Lanes
Thread Starter
Join Date: Oct 2010
Posts: 43
Default

No i just checked the ones that sounded important, pcm ing, engine sensor and pcm something else. Ill check all of them, but i do know it is missing a 30A breaker for windows and i do have the cig. lighter disconnected. Does that matter?
 
  #15  
Old 11-04-2010, 02:45 PM
Camaro 69's Avatar
Senior Moderator
January 2010 ROTM Winner
Join Date: Oct 2007
Location: The 'Burbs of Chicago
Posts: 18,306
Default

The ALDL got its power from the cig lighter circuit, pretty sure your year still does. Check that fuse first.
 
  #16  
Old 11-04-2010, 02:58 PM
Luz Hernandez's Avatar
In the Staging Lanes
Thread Starter
Join Date: Oct 2010
Posts: 43
Default

wow, bad cig fuse, replaced it and was able to get my SES light checked, i have a bad crank shaft sensor
 
  #17  
Old 11-04-2010, 03:08 PM
z28pete's Avatar
Tech Droid
Join Date: Aug 2005
Location: North East PA
Posts: 9,215
Default

The brake light will come on:
1) Low brake fluid
2) Pressure difference in the two master cylinder brake circuits. Possibly due to a bad master cylinder or a fluid leak.
3) Bad master cylinder pressure switche/s.
4) Wiring problem to a pressure switch connection.
5) Hand brake not fully released, or hand brake switch out of adjustment or defective.
6) Wiring problem in brake system (open, shorts, crosses, etc..)
 
  #18  
Old 11-04-2010, 03:11 PM
Camaro 69's Avatar
Senior Moderator
January 2010 ROTM Winner
Join Date: Oct 2007
Location: The 'Burbs of Chicago
Posts: 18,306
Default

It's kinda dumb how GM wired the ALDL to the cig. lighter circuit, but kept it a secret at the fuses.
So, good news you can read it, and bad news because now you know what it is!
Was the error a bad sensor, or sensor circuit?
 
  #19  
Old 11-04-2010, 03:29 PM
Luz Hernandez's Avatar
In the Staging Lanes
Thread Starter
Join Date: Oct 2010
Posts: 43
Default

bad sensor
 
  #20  
Old 11-04-2010, 03:35 PM
greenarrow's Avatar
September 2009 ROTM
ROTM Winner's Club
Join Date: Dec 2008
Location: On your back and in da sun yo!
Posts: 3,115
Default

burnt bulbs will also set the brake light.
 


Quick Reply: Brake light on



All times are GMT -5. The time now is 11:17 AM.