Need to find where this wire goes!

Tanner Instructor South Carolina Posted   Latest   Edited  
Discussion
Electrical
2003 Toyota Land Cruiser 4.7L (2UZ-FE) 5-spd (A750F)
Left Low Beam 10A Fuse Blows

2003 Toyota Land Cruiser blowing the 10a fuse for the LF low beam. The fuse feeds a few wires in connector 1A in the Underwood junction block and one wire in connector 1B Underwood junction block. Pin 33 red/blue Connector 1B is shorted to ground so the vehicle is diagnosed as far as I will be going with it. The problem is that pin and wire does not exist anywhere that I can find it.

if anyone is bored and would like a challenge check your wiring diagrams and see if it exists. I couldn’t find it anywhere on the oem diagrams and also can’t find a pin out of those connectors other than what is given on the oem diagrams when you click the connector list. I cut the wire and drove the vehicle as well as ran everything I could think of in the car and checked all lights and did a system scan. Can’t find anything that stopped working with that wire cut.

Thank you to all who help. I’m trying to save the shop from having to open the entire harness.

pins feed on connector 1A:

19, 26, 28, 20

pins feed on connector 1B

33

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Dick Technical Support Specialist
Quebec
Dick Default
 

To save me some time, what service information services have you tried so far?

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Dick Technical Support Specialist
Quebec
Dick Default
 

Also, suggest trying a year before or after 2003 for a "mid-production" model that might have the missing information. Just a thought.

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Dick Technical Support Specialist
Quebec
Dick Default
 

Here is a screenshot of the different models needed for proper identification. I get kinda anal when I look up information. Thanks for understanding.

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Justin Mobile Technician
Utah
Justin Default
 

Richard I think you might have read it wrong. This is a Toyota vehicle he is working on.

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Dick Technical Support Specialist
Quebec
Dick Default
 

Yep,I realized my stupidity and contacted Tanner through PM. Sorry

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Justin Mobile Technician
Utah
Justin Default
 

I wouldnt call it stupidity. Oversight is all it was. We all misread things from time to time. Anyone who says the don’t does it more than anyone else.

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Dick Technical Support Specialist
Quebec
Dick Default
 

Thanks for the vote of confidence. In the midst of my normal daily routine (red line hectic), I often make those kind of mistakes which I need to learn to "slow down" and look at detail. I thought I could quickly solve Tanner's problem as I am well connected with service information, but I certainly marched off in the wrong direction. Thanks again.

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Randy Diagnostician
California
Randy Default
 

You are trying to find were the other red and blue wire goes right

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Michael Owner/Technician
Florida
Michael Default
 

Alldata's non OE wire diagram has that wire going to energize the fog light relay. Wire color and fuse name match. pin # and connector do not. Hope it help Mike

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Martin Technician
Illinois
Martin Default
 

Does it have fog lights?

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Jj Technician
Massachusetts
Jj Default
 

I just spent a while and went through the Overall Electrical Wiring Diagram on Identifix by filtering for connector 1B and then ctrl+f-ing "33" on the resulting PDF. It really doesn't seem like 1B should have a pin 33. So I searched +/- 2 years, and still nothing. The only red/blue wire I can find coming from the LF low beam fuse is for the fog light relay control. Going to go back through and…

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Tanner Instructor
South Carolina
Tanner Default
 

Thanks for the replies so far, you have all found the same wires I did, the fog light relay is fed by a wire the comes out of connector a1, makes a loop and goes back in. If you look at the connector 1b diagram of the internal circuitry of the junction block you will see it feeds several pins on connector a and only one on connector B but unfortunately it does not show where it goes. at least…

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Martin Technician
Illinois
Martin Default
 

I see what you’re talking about.

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Tanner Instructor
South Carolina
Tanner Default
 

You found it just as I posted it.

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David Owner/Technician
North Carolina
David Default
 

Tanner I used to repair some Toyotas from a body shop. They used to use a light control module under left kick panel. I found it shorted Everytime a headlight was inop. And it was never found in the wiring diagrams anywhere. this may be the same.

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Nicholas Diagnostician
New York
Nicholas Default
 

It only powers the the left front low beam and the fog lamp relay. From the fog lamp relay it goes to the combination switch. I would check those areas first.

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Eric Owner/Technician
Wisconsin
Eric Default
 

Sounds like it's time for the shop to purchase a circuit/wire tracer. The one I have cost less than $100.00 and works great, I've even used it to trace wiring in a friend's older house that had some weirdly done ad on wiring. I've used it to trace wires from one end of the vehicle to the other to find shorts and opens and just to trace wires to find out where they go, just like you need.

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Anthony Technical Support Specialist
Pennsylvania
Anthony Default
 

Hi Tanner: Since it's lunch time, I'll take a stab at it. See if below helps. "In 2002, Toyota introduced Night View, the first worldwide series production active automotive night vision system, on the Toyota Landcruiser Cygnus or Lexus LX470. This system uses the headlight projectors emitting near infrared light aimed like the car's highbeam headlights and a CCD camera then captures that…

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Eric Owner/Technician
Wisconsin
Eric Default
 

Do you have a VIN ?

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