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The marker lights come on but not the headlights. What could be the cause

When I lift the dimmer switch the head lights come

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It is likely one of two things - either the hi beam filament is burned out (if you have one in your headlight) or the hi beam/low beam switch is shot. Markers and headlights are normally on the same circuit so likely not the cause.

Posted on Dec 04, 2014

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99 GMC Sierra headlights & running lights won't work!


Headlights Circuit Description
The headlights are controlled by the body control module (BCM) via the AHL Relay when the headlamp and panel dimmer switch is the AUTO position. When in the AUTO mode, the BCM receives a signal, (voltage) from the ambient light sensor, based on the voltage of the signal of n the sensor the BCM turns the day time running lamp (DRL) lights OFF and the headlights ON. The headlights can also be turned on by placing the headlamp and panel dimmer switch in the head position.
The relay coil is fed by the headlamp and panel dimmer switch or the BCM and the battery B+ buss bar in the underhood bussed electrical center (UBEC). The BCM supplies current to the relay based on the input from the ambient light sensor via CKT 352.
The relay output feeds the LT HDLP and RT HDLP fuses to supply current to the low and high beam lamps on CKT 1340 and CKT 1240. The ground for both the low and high beam lamps is supplied via CKT 524 and CKT 525 to the dimmer switch. The dimmer switch uses CKT 1850 for a ground to G203.
Some circuits are monitored by the BCM, and upon failure may set a DTC.
Park/Side Marker and Tail Lamps
The park/side marker and tail lamps are split between the following 4 fuses:
?€¢
The FR PRK


?€¢
The LR PRK


?€¢
The RR PRK


?€¢
The TRL PRK

These fuses receive voltage from the park lamp relay. When the headlamp and panel dimmer switch is in the auto position, the body control module (BCM) controls the relay by grounding CKT 1080 based on the input of the ambient light sensor. The park LPS fuse supplies battery positive voltage (B+) to the relay at all times.
When the headlamp and panel dimmer switch is in the PARK position, the relay is by passed through the INT PRK fuse. Current flows from the PARK LPS fuse through the headlamp and panel dimmer switch to the INT PRK fuse in order to feed the following fuses:
?€¢
The FR PRK


?€¢
The LR PRK


?€¢
The RR PRK


?€¢
The TRL PRK


Park Lamps Inoperative

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition OFF.
  2. Connect a scan tool.
  3. Turn the ignition to the ON position.
  4. Using the scan tool, check for any DTCs in the body control module (BCM).

Does the scan tool show any DTCs ?
--
Go to Diagnostic System Check - Body Control System in Body Control System
Go to Step 2

2

  1. Turn the headlamp switch to the park position.
  2. Connect a test lamp from (back probe) terminal B of the headlamp and panel dimmer switch to ground.

Does the test lamp light?
--
Go to Step 4
Go to Step 3

3

Locate and repair the open in CKT 240 (ORN) between the switch and the mid bussed electrical center (MBEC).

Is the repair complete?
--
System OK
--

4

Connect a test lamp from (back probe) terminal A of the headlamp and panel dimmer switch to ground.

Does the test lamp light?
--
Go to Step 6
Go to Step 5

5

Replace the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement .

Is the repair complete?
--
System OK
--

6

Connect a test lamp from the INT PRK fuse, located in the left bussed electrical center (LBEC), to ground.

Does the test lamp light?
--
Go to Step 7
Go to Step 8

7

Locate and repair the open in CKT 74 (LT BLU) between the MBEC and the UBEC.

Is the repair complete?
--
System OK
--

8

Locate and repair the open in CKT 74 (LT BLU) between the headlamp and the panel dimmer switch and the LBEC.

Is the repair complete?
--
System OK

Aug 11, 2016 | GMC Sierra Cars & Trucks

1 Answer

1982 chevrolet S10 Only headlights come one with


Voltage for the tail lamps shows to be a brown wire. Use a test light, check that wire for voltage, headlamp switch on. If voltage then check black ground wire.
A problem with grounds will cause some weird things to happen. Ground wires are black. You can use a test light to check ground, one end of testlight comes from battery voltage, the other end you touch ground, black wire, you have to penetrate the insulation. If the lite comes on, at least the ground is good enough for the test light.
At the moment, I don't care about the maker lamps. I do care about tail--stop--turn--tag lamp. In the past, I have been stopped because of no tag light.
Just my opinion.https://s9.postimg.org/af5e5kqtb/tail_lamps.jpg
Click on the link, hope you can read it.

May 30, 2017 | Chevrolet S 10 Cars & Trucks

1 Answer

2000 elantra dash lights dont work. left tail light and front marker light dont work


something between your lights and accessories (a wire) were crossed and it burnt out the wire. check your wires again, go to a website for your vehicle and see if you can find a wire diagram of your vehicle.

Apr 19, 2013 | 2000 Hyundai Elantra

1 Answer

Marker lights and dash lights not working


I'm showing a brown wire coming out of the headlight switch on 96-99 models going to the park lights.
Do you have power on that circuit leaving the headlight switch ?

Feb 18, 2013 | Mercury Sable Cars & Trucks

1 Answer

My tail lights wont shut off


usually when the headlights goes off so does the tail lights thats mean the brake light switch but the side markers are staying on too. it can't be the fuse since they still light. the only thing that breaks the currant is the switch. it sounds like there,s a problem with the headlight switch. the headlight switch operates the side markers and the tail lights along with the head lights. Hope this can helper .

Sep 18, 2012 | 2001 Dodge Ram 2500 Truck

1 Answer

Cadillac lights won't turn on


No relay that I know of.
On 1970s models the headlight switch had a circuit beaker built into the switch for the headlight circuit.
If you have power to the headlight switch and nothing coming out of the terminal for the headlights the circuit breaker may have died.
You would need to replace the switch.

Aug 18, 2012 | 1975 Cadillac DeVille

1 Answer

1999 oldsmobile 88 headlights wont shut off


Headlamp relay contacts could be stuck together causing the headlamps staying on , or the lamp control module is bad .

May 05, 2017 | 1999 Oldsmobile 88

1 Answer

NO LOW BEAM HEADLIGHTS


I've never heard of a headlight relay but most bikes do have turn signal relays...but when my low beam went out it was because the filament burnt out and from your description you said that the high beam works. so you know that its not the starter push button contacts, which usually causes both headlights to not come on, so the only other possibilities is, #1 you have a broken wire going from the starter pb switch to dimmer switch or from dimmer to bulb socket, or the dimmer switch itself is bad. #2 a bad bulb. just check it right now with the key on for voltage in the dim position for 12volts, if you got the voltage then the bulb is bad. can you rate my answer. thanks.

May 09, 2010 | 2008 kawasaki Ninja 250R

1 Answer

No power at the high/ low beam switch, so no head rear markers


Hi and welcome to FixYa,

On your concerns:
  • no headlight - check for +12 on blue wire from fusebox (preferably use a testlight rather than a voltmeter) to headlight switch; do the same to the blue / yellow wire from headlight switch to dimmer switch; the headlight switch is also responsible for switching the rear lights;
  • regulator connector - it is normal for the 3 yellow wires & the white wire to heat up as they pass the charging current to the battery and supply to the bike when running; cause of burning would be loose connection; it may be corrected by cleaning and tightening joint by crimping the female and force fit the male; a bit of electrical grease would be good;
  • wiring diagram - this version might be of help;
  • service manual - try here.
Good luck and thank you for asking FixYa

Aug 01, 2009 | 1991 kawasaki ZZR 600

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