Troubleshooting: High Beams Not Working. - Toyota FJ Cruiser Forum
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post #1 of 19 (permalink) Old 05-03-2016, 10:04 AM Thread Starter
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Troubleshooting: High Beams Not Working.

About six months ago, the high beams on my 2008 FJ ceased working. I have done little night driving outside of local freeways, so it hasn't been a crisis. More of a puzzle. I am always interested in learning more about my ride's electrical system, and I have done multiple searches here to find a thread created by someone else with this problem. However, most headlight threads somehow end up being HID vs LED, DRL /pro/con conversations, which are not addressing my question.

First, some details:

2008 FJ base
OEM headlight units, h4 halogen bulbs, DRLs.
DRLs work perfectly.
Low beams work perfectly.
High beams do not work, either on full-time or flash setting.

Modifications:
The previous owner added a set of Angel Eyes halos to the headlight configuration. These are powered through a tap on the forward (under hood) fuse panel and don't appear to be in conflict with the headlight circuit.

Troubleshooting (and results):

Replaced BULBS with same (nope)
Replaced HEADLIGHT RELAY on fuse panel (nope)
Replaced MULTI-SWITCH on steering column (nope)
Examined visible connections, and the 3-prong power connection behind headlamp units. Power on low setting, no power on high or flash setting.

Still, no high beams.

It seems like it would be a simple fix, but I'm stumped, and the answer is not obviously (to me) found in the existing threads. If anyone has some advice or a link to a thread I may have missed, please share. I would really like to fix this myself if possible.

BLACK BETTY. 2008 FJ CRUISER.
Midlife crisis/expedition vehicle. ATRAC, locking rear differential, Aries grille guard, aftermarket front turn signal mods, vertical grille (ugh) XD-Series black matte wheels, backup camera with rearview mirror display, factory stereo with JL bluetooth receiver installed, OEM roof rack, side mirror LEDs with diffusers removed. All LEDs except headlights. Aux USB chargers.
DOGTOWN, CENTRAL ARKANSAS
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post #2 of 19 (permalink) Old 05-03-2016, 10:19 AM
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Re: Troubleshooting: High Beams Not Working.

I would use a volt meter and the EWD (Electrical Wire Diagram) to troubleshoot the issue... pages 94 thru 96

http://www.lastgreatroadtrip.com/wp-...ng-diagram.pdf
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post #3 of 19 (permalink) Old 05-03-2016, 10:50 AM
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Re: Troubleshooting: High Beams Not Working.

Relay?
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post #4 of 19 (permalink) Old 05-03-2016, 02:36 PM Thread Starter
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Re: Troubleshooting: High Beams Not Working.

Quote:
rotorhed1 previously said: View Post
Relay?
The EWD makes me suspect the DIM Relay. It clicks loudly when I try to activate the highbeams--not sure if that's normal or not. Anyone have advice on how to test one of these things using a multimeter?

BLACK BETTY. 2008 FJ CRUISER.
Midlife crisis/expedition vehicle. ATRAC, locking rear differential, Aries grille guard, aftermarket front turn signal mods, vertical grille (ugh) XD-Series black matte wheels, backup camera with rearview mirror display, factory stereo with JL bluetooth receiver installed, OEM roof rack, side mirror LEDs with diffusers removed. All LEDs except headlights. Aux USB chargers.
DOGTOWN, CENTRAL ARKANSAS
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post #5 of 19 (permalink) Old 05-03-2016, 03:22 PM
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Re: Troubleshooting: High Beams Not Working.

Quote:
Patrick Ralston previously said: View Post
The EWD makes me suspect the DIM Relay. It clicks loudly when I try to activate the highbeams--not sure if that's normal or not. Anyone have advice on how to test one of these things using a multimeter?
Sounds bad and for a few bucks you can replace it. Not worth messing around with IMO.

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post #6 of 19 (permalink) Old 05-04-2016, 02:28 PM
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Re: Troubleshooting: High Beams Not Working.

Did you check the fuses? Each headlight has a separate fuse for both the high and low beams.
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post #7 of 19 (permalink) Old 05-04-2016, 05:23 PM Thread Starter
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Re: Troubleshooting: High Beams Not Working.

Quote:
FJ4RWS previously said: View Post
Did you check the fuses? Each headlight has a separate fuse for both the high and low beams.


Checked every fuse 3-4 times. No luck. I'm going to try to pick up a new DIM relay tomorrow, since it's making suspicious noises. They're fairly cheap.

BLACK BETTY. 2008 FJ CRUISER.
Midlife crisis/expedition vehicle. ATRAC, locking rear differential, Aries grille guard, aftermarket front turn signal mods, vertical grille (ugh) XD-Series black matte wheels, backup camera with rearview mirror display, factory stereo with JL bluetooth receiver installed, OEM roof rack, side mirror LEDs with diffusers removed. All LEDs except headlights. Aux USB chargers.
DOGTOWN, CENTRAL ARKANSAS
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post #8 of 19 (permalink) Old 05-10-2016, 02:28 PM Thread Starter
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Re: Troubleshooting: High Beams Not Working.

Quote:
Patrick Ralston previously said: View Post
Checked every fuse 3-4 times. No luck. I'm going to try to pick up a new DIM relay tomorrow, since it's making suspicious noises. They're fairly cheap.
AND . . . an update. The DIM relay was not the issue. Looks like I will now be tracing every inch of that circuit to find the short. Pulling random components isn't getting me anywhere. Should have done this in the first place.

BLACK BETTY. 2008 FJ CRUISER.
Midlife crisis/expedition vehicle. ATRAC, locking rear differential, Aries grille guard, aftermarket front turn signal mods, vertical grille (ugh) XD-Series black matte wheels, backup camera with rearview mirror display, factory stereo with JL bluetooth receiver installed, OEM roof rack, side mirror LEDs with diffusers removed. All LEDs except headlights. Aux USB chargers.
DOGTOWN, CENTRAL ARKANSAS
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post #9 of 19 (permalink) Old 05-10-2016, 02:56 PM
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Re: Troubleshooting: High Beams Not Working.

Stupid question: Did you check fuses in both fuse boxes?
I'm looking through things and saw their are fuses in the under dash fuse block as well as under hood box.
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post #10 of 19 (permalink) Old 05-17-2016, 08:26 AM Thread Starter
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Re: Troubleshooting: High Beams Not Working.

Quote:
gearwrench previously said: View Post
Stupid question: Did you check fuses in both fuse boxes?
I'm looking through things and saw their are fuses in the under dash fuse block as well as under hood box.
Since I'm still in the dark, not a stupid question AT ALL. My only question would be, which fuse on that panel might be involved?
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BLACK BETTY. 2008 FJ CRUISER.
Midlife crisis/expedition vehicle. ATRAC, locking rear differential, Aries grille guard, aftermarket front turn signal mods, vertical grille (ugh) XD-Series black matte wheels, backup camera with rearview mirror display, factory stereo with JL bluetooth receiver installed, OEM roof rack, side mirror LEDs with diffusers removed. All LEDs except headlights. Aux USB chargers.
DOGTOWN, CENTRAL ARKANSAS
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