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Lost My Low Beams
Thread Starter
4th Gear
Joined: Aug 2008
Posts: 4
Likes: 0
From: San Antonio TX
Lost My Low Beams
While driving at night, my low beams suddenly went out while switching between high and low beams. 
I have inspected all fuses related to the lights in the passenger footwell and the engine compartment, in particular both the L and R low beam fuses in the engine compartment fuse box. No luck. Also, when using remote to unlock, the fog and back-up lights no longer come on momentarily. Amber running lights only illuminate when the lights are in the off position. Running lights lights go off if parking lights are engaged or lights are turned on. Headlight motors work and high beams work. Any ideas? Thanks.
I have inspected all fuses related to the lights in the passenger footwell and the engine compartment, in particular both the L and R low beam fuses in the engine compartment fuse box. No luck. Also, when using remote to unlock, the fog and back-up lights no longer come on momentarily. Amber running lights only illuminate when the lights are in the off position. Running lights lights go off if parking lights are engaged or lights are turned on. Headlight motors work and high beams work. Any ideas? Thanks.
Melting Slicks
Joined: Oct 2007
Posts: 2,383
Likes: 13
From: Kinston North Carolina
Check Voltage on Fuses #8 and #10 in the underhood fuse block. If 0 Volts, probably going to find a problem with multifunction switch. These 2 schematics should help troubleshoot the problem.
Melting Slicks
Joined: Oct 2007
Posts: 2,383
Likes: 13
From: Kinston North Carolina
Tech Contributor
Joined: Jan 2007
Posts: 19,273
Likes: 1,103
From: Dyer, IN
Really? For the low beams not working? Think about the sequence of events here...the only thing you did while driving is turn on the high beams, then the low beams were dead after. So the only thing you touched was the multifunction switch.
Take the wiring diagram to your dealer, and ask them why the tan wire from the multifunction switch runs directly to the low beams and not throught the BCM.
Provided you've checked all fuses, it's probably the mutlifunction switch, but you should verify voltage and ground with a DMM to be sure.
Take the wiring diagram to your dealer, and ask them why the tan wire from the multifunction switch runs directly to the low beams and not throught the BCM.
Provided you've checked all fuses, it's probably the mutlifunction switch, but you should verify voltage and ground with a DMM to be sure.
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Pro
Joined: Jan 2006
Posts: 643
Likes: 2
From: Alexandria Northern Virginia
I'd bet money you could swap the relay on the BCM (and I'd bet thats what is bad if its the BCM at all) just like you can on the door control modules. Man I would go down a road pretty far self-diagnosing before I'd throw a G at headlights.
Those schematics tell you everything you need to know about the circuit. Get some help from somebody good with a voltmeter if it looks like Latin to you and go from there. Sorry you have a problem with it man, sure hope there's a cheap fix.
Cassidy
Those schematics tell you everything you need to know about the circuit. Get some help from somebody good with a voltmeter if it looks like Latin to you and go from there. Sorry you have a problem with it man, sure hope there's a cheap fix.
Cassidy
Tech Contributor
Joined: Jan 2007
Posts: 19,273
Likes: 1,103
From: Dyer, IN
Melting Slicks
Joined: Oct 2007
Posts: 2,383
Likes: 13
From: Kinston North Carolina
Really? For the low beams not working? Think about the sequence of events here...the only thing you did while driving is turn on the high beams, then the low beams were dead after. So the only thing you touched was the multifunction switch.
Take the wiring diagram to your dealer, and ask them why the tan wire from the multifunction switch runs directly to the low beams and not throught the BCM.
Provided you've checked all fuses, it's probably the mutlifunction switch, but you should verify voltage and ground with a DMM to be sure.
Take the wiring diagram to your dealer, and ask them why the tan wire from the multifunction switch runs directly to the low beams and not throught the BCM.
Provided you've checked all fuses, it's probably the mutlifunction switch, but you should verify voltage and ground with a DMM to be sure.
Thanks Lucky, I was waiting for you to come in, it's crazy aint it???
Racer
Joined: Feb 2004
Posts: 359
Likes: 7
From: St. Paul MN
Take the wiring diagram to your dealer, and ask them why the tan wire from the multifunction switch runs directly to the low beams and not throught the BCM.
Provided you've checked all fuses, it's probably the mutlifunction switch, but you should verify voltage and ground with a DMM to be sure.
Provided you've checked all fuses, it's probably the mutlifunction switch, but you should verify voltage and ground with a DMM to be sure.
Have you tried turning off Twilight Sentinel in the DIC options? I'd also check for a stuck relay 44 by verifying if the BCM is really providing ground on terminal H3 with a multimeter.
Todd
Tech Contributor
Joined: Jan 2007
Posts: 19,273
Likes: 1,103
From: Dyer, IN
So by your interpretation of the schematic, you cannot manually turn on the headlights if relay 44 goes bad.
Racer
Joined: Feb 2004
Posts: 359
Likes: 7
From: St. Paul MN
The reading the OP's original comment that the headlight doors do open and close properly also tells me that relay 44 is probably OK. This points back to bad contacts in the headlamp switch itself.
Todd
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
This post is fun
Give us your $1400. We can have fun with it!
You pronounced it wrong!
ITs,,, STEALERSHIP!.
If I were you I would go back there have a word with who ever told you that the BCM was bad. I would be PISSED!
Thats some POOR Stealership troubleshooting but its VERY profitable!
BC
Give us your $1400. We can have fun with it!You pronounced it wrong!
ITs,,, STEALERSHIP!. If I were you I would go back there have a word with who ever told you that the BCM was bad. I would be PISSED!
Thats some POOR Stealership troubleshooting but its VERY profitable!
BC
Melting Slicks
Joined: Oct 2007
Posts: 2,383
Likes: 13
From: Kinston North Carolina
Tech Contributor
Joined: Jan 2007
Posts: 19,273
Likes: 1,103
From: Dyer, IN
