Passenger side Low beam doesn't work

Tiny
MUDDNSNOW
  • MEMBER
  • 2008 TOYOTA HIGHLANDER HYBRID
  • 3.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 211,000 MILES
Passenger side Low beam doesn't work, I have replaced the bulb with 2 others just to be sure it wasn't defective. The wiring on the connector looks good. I'm out of ideas.
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Friday, October 18th, 2019 AT 9:16 AM

13 Replies

Tiny
KASEKENNY
  • EXPERT
So if we eliminated the bulb that means we need to check the wiring and fuses highlighted in the attachments.

To do this we need to test for voltage at the bulbs when they are turned on. You can do this by back probing the connector with a known good bulb installed but we need to find out if there is voltage there. I am guessing there is not, that means we need to check the fuses (you may have already done this). If the fuses are good and still no voltage then we need to check the relays. Swap the right hand with the left hand relay and see if the issue changes sides. If so, then the relay is the issue.

Let me know what you find and we can go from there. Thanks
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Tuesday, November 12th, 2019 AT 5:56 PM
Tiny
MUDDNSNOW
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Okay, I will try this after work tomorrow! Thanks I will let you know the results!
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Tuesday, November 12th, 2019 AT 8:06 PM
Tiny
KASEKENNY
  • EXPERT
Okay. Sounds great. I will wait to hear back. Thanks for the update.
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Wednesday, November 13th, 2019 AT 7:09 PM
Tiny
MUDDNSNOW
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So I finally got a chance to look at this, the fuses are good, but I cannot find the headlight relays. I've tore into all the fuse locations that I can find.
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Sunday, November 17th, 2019 AT 4:11 PM
Tiny
KASEKENNY
  • EXPERT
They are in the underhood junction box but I am surprised to see they are not labeled in the manual. It is going to be one of the ones circled. Do you have the owners manual? They normally list them in there.
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Sunday, November 17th, 2019 AT 4:47 PM
Tiny
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Here is what I have.
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Sunday, November 17th, 2019 AT 4:56 PM
Tiny
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I see no headlight relay, only the 4 15amp fuses.
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Sunday, November 17th, 2019 AT 5:00 PM
Tiny
KASEKENNY
  • EXPERT
The wiring diagram says it is in the J/B Assembly. Here is a picture of where that is. Is this the one you took a picture of?
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Sunday, November 17th, 2019 AT 6:01 PM
Tiny
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Yes that's the picture I took.
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Sunday, November 17th, 2019 AT 6:05 PM
Tiny
KASEKENNY
  • EXPERT
Okay. I thought so. This is a new one on me.

Clearly the shape of the box is the same. What are the two long "relays" that I circled? Can you remove these at all? This is where the diagram shows the relays located.

If you can't lets just move on. Just measure voltage at the fuse that is down in the circuit and see if you have voltage on both sides of the fuse. If you do, whatever or where ever that relay is, is not our issue.
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Monday, November 18th, 2019 AT 6:20 PM
Tiny
MASTERWRENCH
  • EXPERT
Those long, tan devices are actually integrated fuses. You'll need to pull them out of the junction block and visually inspect them for any blow/burned out sections. See below.
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+1
Monday, November 18th, 2019 AT 6:41 PM
Tiny
MUDDNSNOW
  • MEMBER
Okay, I'll check them tomorrow! I appreciate all of the insight from the two of you.
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Monday, November 18th, 2019 AT 7:06 PM
Tiny
MASTERWRENCH
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No problem. Keep us posted!
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Monday, November 18th, 2019 AT 7:50 PM

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