Question about Chevrolet Cobalt

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I just replaced the LH headlamp bulb on my 2006 Chevy Cobalt and I still have no Hi beam light

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  • Chevrolet Master
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Some vehicles have a fuse for low and high beam, check all fuses. also check wiring harness good.

Posted on Mar 20, 2011

Testimonial: "thanks didnt know it had a fuse for hi and low beam"

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Low beams dont work and only one high beam works


Do you know how to do voltage drop testing ? Leave the blubs in there sockets turn the low beams on , measure voltage on the power side , LH low beam yellow with black stripe an for the RH low beam dark blue wire . If you have battery voltage there, power side is good . Then check ground side both are yellow wires , test with lights on . if you see 6 volts , 12 volts .anything more then .03 millivolts you have a ground side problem . The lights ground through the light switch .
Low Beam
Voltage to the headlamp switch is available at all times from the HDLP SW fuse 7 through CKT 1940 (ORN). When the headlamp switch is turned to the HDLP position, the headlamp power relay coil is energized through CKT 352 (WHT). A signal is also sent to the body control module (BCM) that the headlamp switch is ON. When the headlamp switch is in the AUTO or PARK position, the ambient light sensor (located in the right speaker grill) senses either daylight or darkness and sends the signal to the BCM. When the Ambient Light Sensor detects a dark condition, the BCM produces a signal that will energize the headlamp power relay through CKT 352. The relay coil is grounded through terminal F7 connector 2 of the underhood fuse block to CKT 350 (BLK) to G102. When the headlamp power relay is energized the relay supplies power to the LT HDLP and RT HDLP fuses. The RH low beam headlamp receives current through CKT 198 (DK BLU) from the RT HDLP fuse. The LH low beam headlamp receives current through CKT 712 (YEL/BLK) from the LT HDLP fuse. Both headlamp low beam bulbs are grounded by CKT 524 (PPL) through the underhood fuse block to the multifunction switch (low position) contacts through CKT 10 (YEL) to the headlamp grounding relay in the body relay block through the normally closed contacts to CKT 1850 (BLK) to G200.

Oct 14, 2015 | 1999 GMC Sonoma

2 Answers

2006 Chevy Trailblazer low beam headlamps will not work. Here's a list of what I have done. Changed both low beam headlamp bulbs Swapped cooling fan relay and HDM relay -headlamps worked but cooling fan...


Hi Ryan, check the fuse to the low beam, if your not getting power to the relay it will never work, the fact that you have 3 new relays they can't all be duff

Aug 30, 2014 | Cars & Trucks

1 Answer

Where are the Headlight relays on 2002 Renault clio


The headlamp circuit is rather simple. From the 15 amp RH headlamp fuse, there is a red w/yellow trace that goes to the RH high beam. Out of the 15 amp LH headlamp fuse, the wire going to the LH Hi beam is solid red. Both of these wires should have power when the headlamp relay is energized. The wires from the Hi Beam bulbs going back to the switch should both be red w/black trace. The wire going from the headlamp relay to power the 2 15 amp fuses is white. The headlamp switch applies a ground to illuminate either the Lo Beams or the Hi Beams.

Sep 11, 2012 | 2002 Renault Clio

1 Answer

Fluid resevoir light in dash stays on all the time


The headlamp circuit is rather simple. From the 15 amp RH headlamp fuse, there is a red w/yellow trace that goes to the RH high beam. Out of the 15 amp LH headlamp fuse, the wire going to the LH Hi beam is solid red. Both of these wires should have power when the headlamp relay is energized. The wires from the Hi Beam bulbs going back to the switch should both be red w/black trace. The wire going from the headlamp relay to power the 2 15 amp fuses is white. The headlamp switch applies a ground to illuminate either the Lo Beams or the Hi Beams.

Sep 11, 2012 | 1997 Ford Falcon

1 Answer

My low beam is not working i replaced the bulb and its still not working


Check the fuse no.# 20 - F20 (15A) = RH headlamp - low beam & the fuse no.# 21 - F21 (15A) = LH headlamp - low beam, located in the fuse box / relay plate fascia 1, placed on the driver's lateral side of the dashboard, door open. See pictures below:

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Jan 21, 2011 | 2003 Volkswagen Passat

1 Answer

My brights quit working. My headlights work fine on my 2006 Chevy Equinox


Most of the time I find that both headlight bulbs are burned out. Remove the headlamp, open the hood and remove the retainers that hold the front grill/bumper cover to the upper radiator support. The gently pull out on the front bumper cover that goes over the headlamp to release the retainer and cover retainer with tape to avoid scratching the headlamp lens. remove the 3 bolts that hold the headlamp in place 2 at the top and one down at the bottom of the headlamp on the inboard side. Pull out on the outboard bottom part of the headlamp to release the retainer. Disconnect the headlamp bulb ck for power and ground at the headlight bulb connector. Use a test light and ck the red and white wire voltage and the d blue and pnk wires for ground. The high beam is the pink wire.So connect your test light from the pink wire to the red and white wire and turn on the high beam headlights your test light should light if it does then the bulb is burned out.

Feb 15, 2010 | 2007 Chevrolet Equinox LS New Cars

1 Answer

Passenger headlight don't work 2003 lincoln navagator


high beam or low beam? or both of them on one side.

  • One low beam headlamp is inoperative
  • Central junction box (CJB) fuse 23 (10A) (RH headlamp).
  • CJB fuse 25 (10A) (LH headlamp).
  • Circuitry.
  • CJB.
  • Go To Pinpoint Test C .


  • One high beam headlamp is inoperative
  • Circuitry.
  • Headlamp assembly.
  • Go To Pinpoint Test D .

  • The high and low beam headlamp is inoperative on one side
  • Circuitry.
  • REPAIR ground circuit 57 (BK).


  • Headlamp switch
  • Multifunction switch
  • Vehicle Security Module
  • Central junction box (CJB) fuse(s):
    • 17 (15A)
    • 23 (10A)
    • 25 (10A)
    • 35 (20A)
    • 40 (20A)
  • Circuitry
  • Headlamp bulbs
  • Daytime running lamp (DRL) relay



Apr 19, 2009 | 2003 Lincoln Navigator

1 Answer

99 nissan sentra headlamp - hi beam low beam issues


could be the switch. did you do anything to the switch when you changedheadlamps? maybe you put the lamp in incorrectly also did the brights work on the lamp that was "burned out"?

Jan 29, 2009 | 2000 Nissan Maxima

3 Answers

No Hi Beam on 93 Camry


The headlamp circuit is rather simple. From the 15 amp RH headlamp fuse, there is a red w/yellow trace that goes to the RH high beam. Out of the 15 amp LH headlamp fuse, the wire going to the LH Hi beam is solid red. Both of these wires should have power when the headlamp relay is energized. The wires from the Hi Beam bulbs going back to the switch should both be red w/black trace. The wire going from the headlamp relay to power the 2 15 amp fuses is white. The headlamp switch applies a ground to illuminate either the Lo Beams or the Hi Beams.

Sep 10, 2008 | 1993 Toyota Camry V6

3 Answers

2006 chevy cobalt headlights.


There are 2 nuts at top of headlight..Loosen those, also remove plastic push in tabs from grill...after that You will need to pry the headlamp out.It will take a few mins.!! Do not repalce the bulbs w/ those "Blue" bulbs they last all of 2 months,Because of the daytime running lights.It takes the life out of the bulb cause they run hotter!

Jul 16, 2008 | 2006 Chevrolet Cobalt

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