LSC15's 95 Tacoma 4x4

Go Back   Tacoma World Forums > Tacoma Garage > Lighting

Notices

Headlight problems

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-02-2013, 09:14 AM   #1
chickaloon [OP] chickaloon is offline
Junior Member
chickaloon is on a distinguished road
Joined: Feb 2013, #96663
Gender: Male
Posts: 5
chickaloon's Tacoma Gallery
Headlight problems

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.
  Reply With Quote
Old 02-02-2013, 09:44 AM   #2
chickaloon [OP] chickaloon is offline
Junior Member
chickaloon is on a distinguished road
Joined: Feb 2013, #96663
Gender: Male
Posts: 5
chickaloon's Tacoma Gallery
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.
  Reply With Quote
Old 02-02-2013, 12:01 PM   #3
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
chris4x4's Avatar
Name: FlimFlubberJAM
Joined: May 2008, #6497
Location: Tenoe, AZ
Gender: Male
Posts: 94,130
chris4x4's Tacoma Gallery
Try different bulbs. I know you checked the continuity, but its worth a shot.
  Reply With Quote
Old 02-02-2013, 12:35 PM   #4
chickaloon [OP] chickaloon is offline
Junior Member
chickaloon is on a distinguished road
Joined: Feb 2013, #96663
Gender: Male
Posts: 5
chickaloon's Tacoma Gallery
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?
  Reply With Quote
Old 02-05-2013, 08:20 PM   #5
Senior Member
joes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shed
Name: Joe
Joined: Jan 2010, #28588
Location: Central Coast, CA
Gender: Male
Posts: 3,102
joes06tacoma's Tacoma Gallery
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.
  Reply With Quote
Old 02-06-2013, 11:13 AM   #6
chickaloon [OP] chickaloon is offline
Junior Member
chickaloon is on a distinguished road
Joined: Feb 2013, #96663
Gender: Male
Posts: 5
chickaloon's Tacoma Gallery
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.
Attached Files
File Type: pdf headlihghts wiring 2001 tacoma.pdf (46.3 KB, 35 views)
  Reply With Quote
Old 02-06-2013, 06:13 PM   #7
Senior Member
joes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shed
Name: Joe
Joined: Jan 2010, #28588
Location: Central Coast, CA
Gender: Male
Posts: 3,102
joes06tacoma's Tacoma Gallery
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.
  Reply With Quote
Old 02-07-2013, 11:09 AM   #8
chickaloon [OP] chickaloon is offline
Junior Member
chickaloon is on a distinguished road
Joined: Feb 2013, #96663
Gender: Male
Posts: 5
chickaloon's Tacoma Gallery
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.
  Reply With Quote
Old 02-07-2013, 07:04 PM   #9
Senior Member
joes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shedjoes06tacoma is one of the sharper tools in the shed
Name: Joe
Joined: Jan 2010, #28588
Location: Central Coast, CA
Gender: Male
Posts: 3,102
joes06tacoma's Tacoma Gallery
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?
  Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Headlight problems MapleMoose Technical Chat 6 06-07-2011 01:48 PM
Damn electrical problems! :-( headlight help fireturk41 1st Gen. Tacomas 3 02-06-2010 01:31 PM
Do you have fading black plastic and headlight problems?? Lentsnh Detailing 29 01-23-2010 01:44 PM
HID headlight problems??? TRDfarmerTN Lighting 1 01-31-2009 11:59 PM
Halo Headlight Problems! URGENT NumNutz Detailing 0 09-08-2008 03:13 PM


Copyright © 2014 Tacoma Forum. Tacoma World is not owned by, or affiliated with Toyota Motor Corporation.