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Headlight problems

Discussion in 'Lighting' started by chickaloon, Feb 2, 2013.

  1. Feb 2, 2013 at 9:14 AM
    #1
    chickaloon

    chickaloon [OP] Member

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    2001 tacoma

    My low and high beams are not working.

    4 fuses are good

    relay is clicking, seems to be working and is allowing the daytime headlight option to function.

    bulbs look good, not burned out, and the daylight setting is working.

    Could it be the control switch?
    Could there be a separate dimmer switch problem?

    I am using the daylight setting on the control switch to drive at night, but this means no high beams and the lights seem dim. When I set the lights to "full on" position the lights go out. When I set to high beam, they go out.
     
  2. Feb 2, 2013 at 9:44 AM
    #2
    chickaloon

    chickaloon [OP] Member

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    I just ran the multi meter on the plug to one of the lights.

    With the lights setting in the on position I get 14+ volts in all three contacts

    with the lights on the daylight setting I get 14+ in the top position and 3volts in the other two positions.

    I pulled one of the lights and it looks good. I checked continuity and I get good results on all the nodes.

    Don't get it. Seems like I should have light.
     
  3. Feb 2, 2013 at 12:01 PM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    FlimFlubberJAM
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    Try different bulbs. I know you checked the continuity, but its worth a shot.
     
  4. Feb 2, 2013 at 12:35 PM
    #4
    chickaloon

    chickaloon [OP] Member

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    bulbs both work in the daylight position.

    anyone got a free wiring schematic for trouble shooting lighting system.
    specifically the headlight and the dimmer relay?
     
  5. Feb 5, 2013 at 8:20 PM
    #5
    joes06tacoma

    joes06tacoma Well-Known Member

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    Central Coast, CA
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    06 4x4 Off Road Access Cab v6 6spd
    LEER Shell with dome lights operated with 3 way switches, aux backup lights with relay and 3 position switch, modified wiring to compass/temp display and clock to include switch that disables dimming function (poor man's DRL solution), Scan Gauge 2
    I don't have access to the wiring schematic, and I know that the first gen drl system was pretty complex. However, from your description you are checking voltage at the headlights with reference to ground? In other words, one probe in the headlight plug, the other grounded? If that's true, then it sounds like you are losing the ground to the headlights.

    I would try this: as you face the rear of the headlight plug, the common terminal that carries positive power into the headlight should be on the left. To confirm this, unplug both headlights and probe either headlight plug while disconnected. You should have positive power at the left side common terminal.

    Still with me? Once you have confirmed that the positive is on the left (I don't want you to blow a fuse, and I'm only 95% certain), then you hook the headlights back up, and supply a ground to either the center or the right side terminal at the back of one headlight. If it lights up, you've confirmed you are missing the ground. On most Toyota trucks before the 2nd gens, the ground runs through the dimmer (hi/low) switch on the column. I would suspect that your dimmer switch has failed.
     
  6. Feb 6, 2013 at 11:13 AM
    #6
    chickaloon

    chickaloon [OP] Member

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    On one headlight socket I measured resistance and found way too much. I added a ground wire to the light socket ground (right hand wire if you are looking at the light) and attached it to the negative battery terminal. Lights are working in full low beam and high beam, but the slightly dimmer daylight setting is at full low beam.

    Not sure where to go from here.
     

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  7. Feb 6, 2013 at 6:13 PM
    #7
    joes06tacoma

    joes06tacoma Well-Known Member

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    LEER Shell with dome lights operated with 3 way switches, aux backup lights with relay and 3 position switch, modified wiring to compass/temp display and clock to include switch that disables dimming function (poor man's DRL solution), Scan Gauge 2
    Just to clarify: when you say the ground wire is the right hand wire when looking at the light, am I looking at the back side of the light (under the hood) or am I looking at the glass side of the light (from the outside of the truck)

    From the diagram, if you added a ground and now your lights work, then the DRL relay isn't supplying a ground to the lights in normal mode. Just as an additional test, does the "flash to pass" function work without your new jumper installed? The DRL 4 relay appears to be for "flash to pass", and the only other ground to the headlights is the main DRL relay on the left of the diagram.
     
  8. Feb 7, 2013 at 11:09 AM
    #8
    chickaloon

    chickaloon [OP] Member

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    This is looking at the glass from the front of the vehicle.

    Before I added the ground, as part of my diagnostic, I took good relays , both dimmer and head from another vehicle (same part numbers), and put them in mine. I experienced the exact same problems. So I ruled out the relays, reinstalled mine and moved on.

    Flash to pass works in all three settings on the light switch in the vehicle.
     
  9. Feb 7, 2013 at 7:04 PM
    #9
    joes06tacoma

    joes06tacoma Well-Known Member

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    Central Coast, CA
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    06 4x4 Off Road Access Cab v6 6spd
    LEER Shell with dome lights operated with 3 way switches, aux backup lights with relay and 3 position switch, modified wiring to compass/temp display and clock to include switch that disables dimming function (poor man's DRL solution), Scan Gauge 2
    I believe the main DRL relay is bad.

    The question is, is it worth replacing that relay ($), when you can just add a ground wire to each headlight, using wire that is the same size or larger as what is already there, and your lights will work. I don't see the downside to that. Sounds like the only side effect is the DRL function being brighter? Possibly shorter bulb life?
     
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