High beam Headlights not working - Toyota Nation Forum : Toyota Car and Truck Forums
Highlander 2nd Generation (2008-2013) Forum dedicated to the discussion of 2nd generation Toyota Highlanders.

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post #1 of 33 Old 04-07-2019, 01:14 PM Thread Starter
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High beam Headlights not working

Hey, just wanted to ask if anyone knows if there is a relay for the high beam headlights on my 2010 highlander. They just stopped working the other day. I don't use them that much but wanted to try to get them working again. I have checked both fuses, under the hood, for the left and right high beams and they are good. I have taken both bulbs out and checked the filament and they are both good as well. When i push out the switch (turn signal lever) inside the car to activate the high beams the notice on the dash comes on that says they are on but they are not. I jumpered a wire from the positive side of the battery to the fuse on the high beams and they turn on and work fine (don't know if that is bad for the car or not). I have checked for voltage at the fuse box and the bulb connectors on the high beam side and there is nothing, only on the low beam side. This is the only function on the turn signal switch that is not operating correctly. I didn't know if there was a relay for the high beams or how i can tell if it's the turn signal switch on the column? I did take the covers off the steering column and i didn't see any lose wires or anything. Any suggestions would be greatly appreciated.
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post #2 of 33 Old 04-07-2019, 01:22 PM
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Have you looked at a wiring diagram?

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post #3 of 33 Old 04-07-2019, 01:26 PM Thread Starter
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Originally Posted by Vangm25 View Post
Have you looked at a wiring diagram?
No i haven't. I am several steps below a shade tree mechanic. haha. I wouldn't know what i was looking at if it wasn't for people like you doing write ups and diys.
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post #4 of 33 Old 04-07-2019, 02:04 PM
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Basically you went from step one of knowing the issue to step three of testing the issue. Step two is troubleshooting the issue. The wiring diagram will show the connectors, fuses, relays, switches, and other components to test.

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post #5 of 33 Old 04-07-2019, 02:20 PM Thread Starter
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Originally Posted by Vangm25 View Post
Basically you went from step one of knowing the issue to step three of testing the issue. Step two is troubleshooting the issue. The wiring diagram will show the connectors, fuses, relays, switches, and other components to test.
I'm just not sure where to look for a wiring diagram to see if there is a relay for the high beams or how to test the turn signal switch to make sure it's working properly. I was really really hoping there was a relay that i could switch with the low beam headlights or something.
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post #6 of 33 Old 04-07-2019, 02:33 PM
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Quote:
Originally Posted by biker5500 View Post
I'm just not sure where to look for a wiring diagram to see if there is a relay for the high beams or how to test the turn signal switch to make sure it's working properly. I was really really hoping there was a relay that i could switch with the low beam headlights or something.
Wiring diagram would tell you that. Up to you to either get a wiring diagram, using Toyota TIS and getting your two days, or making do without it. If you get a wiring diagram, I may be welling to trace it for you. Problem could be anything, could be so simple we don't actually need a diagram or more annoying that we have a lot of diagnostics to do. I sure don't know what is wrong with it without being there or not having a wiring diagram. Someone else might be willing to chime in on better assisting you.

If anything, just check your basics again and make sure everything is hooked up. Do a google search and maybe you will get lucky on finding a wiring diagram.

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post #7 of 33 Old 04-07-2019, 05:00 PM Thread Starter
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Originally Posted by Vangm25 View Post
Wiring diagram would tell you that. Up to you to either get a wiring diagram, using Toyota TIS and getting your two days, or making do without it. If you get a wiring diagram, I may be welling to trace it for you. Problem could be anything, could be so simple we don't actually need a diagram or more annoying that we have a lot of diagnostics to do. I sure don't know what is wrong with it without being there or not having a wiring diagram. Someone else might be willing to chime in on better assisting you.

If anything, just check your basics again and make sure everything is hooked up. Do a google search and maybe you will get lucky on finding a wiring diagram.
Sounds good. I will try to google those wiring diagrams and maybe someone on here has has this same problem before and knows what to look for. Thanks so much for your help Vangm25.
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post #8 of 33 Old 04-07-2019, 05:57 PM
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See if this helps...
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2011 Highlander Lmtd
Black
purchased 11/23/18 w/ 39000 miles
Pacific NW

Last edited by scoutyjones2; 04-07-2019 at 06:01 PM.
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post #9 of 33 Old 04-07-2019, 06:02 PM
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one more symbols key to wiring
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2011 Highlander Lmtd
Black
purchased 11/23/18 w/ 39000 miles
Pacific NW
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post #10 of 33 Old 04-07-2019, 06:16 PM Thread Starter
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Originally Posted by scoutyjones2 View Post
one more symbols key to wiring
Thank you so much. I will take a look and see if I can figure anything out.
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post #11 of 33 Old 04-07-2019, 06:49 PM
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It's a "simple" looking diagram for just the high beam circuit. I will try highlighting it soon.
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post #12 of 33 Old 04-07-2019, 07:05 PM
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Not sure if this helps at all.
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2011 Highlander Lmtd
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purchased 11/23/18 w/ 39000 miles
Pacific NW
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post #13 of 33 Old 04-07-2019, 07:06 PM
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I am confused on how the relay I highlighted works in yellow. Otherwise this is what I believe how the high beams work. I am also not sure if the light blue DRL wire is relevant.
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post #14 of 33 Old 04-07-2019, 07:48 PM
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This is what I would test for:
  1. Test for power from the high beam connector
  2. Test for power from the high beam fuses
  3. Test for power from the relay highlighted in yellow
  4. Test for power from connector 2G pin 1
  5. Test for power from connector 2D pin 8 and/or 9, which ever one or both is connected.
Options to consider:
  1. Swap low beam relay(s) with other identical relay's
My assumption is that connector 2D pin 8 is the high beam wire as DRLs are typically high beams. My assumption is also that the ground wire is connected as you said that you got the high beams working by directly connecting the battery to the fuse. The circuit is relatively simple like I said before, I just don't get how the H-LP (HI) Relay works. I also sorta doubt you would need to go pass the ECU but don't take my word for it. Good luck!

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post #15 of 33 Old 04-07-2019, 08:04 PM Thread Starter
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Ok, thanks guys. I'm going to do some more testing and try to find that hi beam relay that is in the wiring diagram. I was unable to find it today during my searching.
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