Go Back   Chevrolet Forum - Chevy Enthusiasts Forums > Past Chevrolet Cars > Cobalt
Sign in using an external account
Register Forgot Password?
Search

Cobalt This sporty compact was faced with the difficult job of replacing the popular Cavalier, but whether the base model, or the supercharged SS is chosen, is has made for a great replacement.
Platform: Delta
Also Check out CobaltSS.net

Reply
 
 
 
 
LinkBack Thread Tools
  #1  
Old 08-10-2011, 07:32 AM
CF Beginner
 
Join Date: Aug 2011
Posts: 4
Unhappy Daytime Running Lights problem

On my 2007 Cobalt, the auto function for headlights is not working correctly. If the setting is "auto" then the daytime running lights (DRL) should be on in the daytime and the headlights at night. In my case, the headlights are always on. This causes the dash displays to dim and be virtually unreadable during the day; it's also a waste of headlight and parking light life.
The light sensor tests ok and the wires leading to the sensor have a 5V reference signal which I think is correct. The DRL fuse is also ok.
I'd appreciate any ideas on what else to check?
Register today for free or log-in if already registered to remove this ad!
Reply With Quote
  #2  
Old 08-10-2011, 11:36 AM
CF Veteran
 
Join Date: Mar 2011
Posts: 1,706
Default

Welcome to the forum. Your symptoms are consistent with the BCM sensing a fault on the ambient light sensor circuit, i.e., the automatic lamp control is inoperative and defaults to the low light status. How did you test the sensor?
Reply With Quote
  #3  
Old 08-11-2011, 07:27 AM
CF Beginner
 
Join Date: Aug 2011
Posts: 4
Default Sensor Testing

I tested the sensor three ways. First, I disconnected it from the wiring harness and checked that the resistance across the terminals; resistance varied depending on how much light was on it. Second, I checked the voltage across the sensor when it was plugged into the harness; the voltage varied from about 0.7V to 4.6V depending on the amount of light. Third, I checked the voltage across the sensor as seen at pin 44 of the Body Control Module (BCM) C2 connector; that reading matched the reading at the sensor.

Since the sensor seems to be working as expected, I'm thinking it's either an intermittent sensor problem, a connection problem, a relay somewhere, or maybe an issue with the BCM. I'm still fiddling with it.

Last edited by Zorb; 08-11-2011 at 07:30 AM.
Reply With Quote
  #4  
Old 08-11-2011, 11:34 AM
CF Veteran
 
Join Date: Mar 2011
Posts: 1,706
Default

It could even be a malfunction in the turn signal MFS. It probably boils down to what the BCM is sensing and commanding but without a sophisticated scan tool, it's near impossible to work on it nowadays.
Reply With Quote
  #5  
Old 08-12-2011, 07:52 AM
CF Beginner
 
Join Date: Aug 2011
Posts: 4
Default Seems to be working now

Somewhere during the process of checking all of the headlight and DRL sensor signals at connector C2 of the BCM I noticed that the lights seemed be working correctly. I've been watching things for a day now and the daytime running lights, auto lights, and headlights seem to be working properly again. I suspect a bad connection at the C2 connector was to blame, and removing/reseating the connector during testing was enough to improve the connection and fix the lights.
Reply With Quote
  #6  
Old 08-12-2011, 12:50 PM
CF Veteran
 
Join Date: Mar 2011
Posts: 1,706
Default

Congrats. Thanks for the update.
Reply With Quote
  #7  
Old 01-19-2012, 12:06 PM
CF Beginner
 
Join Date: Jan 2012
Posts: 4
Default

Quote:
Originally Posted by Zorb View Post
On my 2007 Cobalt, the auto function for headlights is not working correctly. If the setting is "auto" then the daytime running lights (DRL) should be on in the daytime and the headlights at night. In my case, the headlights are always on. This causes the dash displays to dim and be virtually unreadable during the day; it's also a waste of headlight and parking light life.
The light sensor tests ok and the wires leading to the sensor have a 5V reference signal which I think is correct. The DRL fuse is also ok.
I'd appreciate any ideas on what else to check?

I am too having problems out of my 2010 Chevy Cobalt drl.It has been in the shop twice in the last three months for the same thing.I have even sent gm a email about this problem.
Reply With Quote
  #8  
Old 01-19-2012, 04:14 PM
Official GM Rep
 
Join Date: Mar 2010
Location: Michigan
Posts: 3,606
GMLouisFischer
Default

geroy1212,

Is your problem the same as Zorb's? You stated you've taken the vehicle in twice for this issue, were they able to offer possibilities?

Any additional information you can provide may help.

I look forward to your reply.

Louis
GM Customer Service
Reply With Quote
  #9  
Old 01-20-2012, 12:06 PM
CF Beginner
 
Join Date: Jan 2012
Posts: 4
Default DRL on 2010 Chevroley Cobalt

They replaced the bcm modular but it is still did not fix the problem.And I get a message saying the auto lights are off when the switch is turn on,I have to turn the switch off then back on.As soon as I can I am going to trade this car off and get me something else.And I am sure it will not be made by Chevrolet.
Reply With Quote
  #10  
Old 01-31-2012, 08:32 PM
bradhohio's Avatar
CF Beginner
 
Join Date: Dec 2011
Location: Columbus,Ohio
Posts: 2
Default

The daytime running lites are the headlights. They are supose to be on in the daytime.
Reply With Quote
Old 01-31-2012, 08:32 PM
 
 
 
Reply

Tags
07, 2007, auto, chevrolet, chevy, cobalt, day, daytime, lamps, light, lights, malfunctioning, problem, problems, running, working


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


Join Chevroletforum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 09:30 PM.

Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO ©2010, Crawlability, Inc.

Emails Backup