Bet you 100$ you can't figure it out....

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Bootymeat

Banned
Nov 4, 2009
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Bev Hills 90210
Here's the problem, I have no dash, tail lights or driving lights.
I have stop lights.

Okay, from my research, the dash lights, driving lights and tail lights (Not brake lights) are on the SAME circut. Don't believe me? Pull your "Tail" fuse in the drivers kick panel. So, this means there is a break or short in the circut somewhere. Look a little closer....

Here's the common problems that create a break in the circut, and what I have fixed.

1st : Tail lamp failure box : I did the re-wire, only to come up with nothing.

2nd : Dimmer switch : I believe this has nothing to do with the circut, but moreso the dash lights themselves. I replaced the part from Toyota and nothing.

3rd : Grounds : I have spent a total of 3 hours connecting every single ground I could find. The Grounds in the tail lights are fine (White wire with black stripe) Nothing is cracked or damaged around the grounds, they seem to have a good connection. Also checked the area around the engine bay. All body grounds, grounds under the manifold are grounded properly and are connected.

4th : Radio : I was told the radio is illuminated by the same circut. Plugged the factory in, It worked. Still no tail, driving, or dash lights

5th : Tail lamp fuse : Took the fuse out, looked fine, replaced with a new of the same amp and nothing.

6th : Hazard flasher : It's plugged up, hazards work and same for turn signals.

7th : Comination switch : The highlights work, they go up and down. But the circut is connected to the combination switch, could this be it? How would I test it?


What else could cause a break in this specific circut? And where would it be?

I replaced the dash board, and I have been thinking it's something around or under the dash that needs to be plugged in, in order for the circut to be hot.

But.. I have checked everything, there are a few female plugs I cannot find the male plugs to, but I have made sure all grounds behind the dash are grounded correcty to the body and not corroded.



Seriously guys, I'm stumped. I have never had such a problem with such a small issue.

Any help would be thankful.
 
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dusthead

C-C-C-C-COMBO BREAKERRRRR
Aug 10, 2009
100
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New London, CT
i'm not an expert on supras - but if you have a multimeter...i'd pull out the cluster and start checking for current. even a ground tester would work with just two ends and a light inbetween. you can check the supply current, then the ground side to see if it's going through. if it is - its a ground internal to the cluster...if not, then the circuit is broken at the cluster. go to the TSRM and check out the wiring diagram for the lights that aren't working and follow them backwards to systems before it.

some electrical issues can take a long time to troubleshoot...and when you find the issue it's usually something stupid like a broken wire or corroded ground.
 

RazoE

Boobs/Boost, my favorite
Jun 13, 2006
4,946
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Los Angeles
www.cafepress.com
do your side markers work..?

temporary solution:
My 89 was doing this when I first got it, and it was getting on my nerves, so I actually took the rear sidemarker pigtail with the bulb, and wedged it in my taillights, so they acted as the regular driving lights, and since my regular bulbs worked when I used the brakes, they lit up..

it was dim, but I was never pulled over..
 

CRE

7M-GE + MAFT Pro + T = :D
Oct 24, 2005
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Denver, CO
Pull the tail lamp fuse and test there for power with the lights turned on. Might also just replace the fuse, even if it looks good.
 

Bootymeat

Banned
Nov 4, 2009
51
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Bev Hills 90210
My turn signals wouldn't work if I didn't have the flasher plugged in.

No power to the fuse. Where does the power come from, somewhere by the alternator?

No, I do NOT have side markers.
 

Bootymeat

Banned
Nov 4, 2009
51
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Bev Hills 90210
Alright, got pulled over and cited for it. I work during the night so I need this fixed.

Here's what I've came up with so far. The tail lights, gauge cluster lights, and driving lights are on the same circut. So I'm assuming it'sa short or break in the circut. I eliminated the tail lamp failure module by a how to guide on here. So that's no it. I eliminated a bad fuse, that not it. I have no loose connections on my tail lights, grounds, or plugs. Everything seems to be okay.


As of right now I need help finding out what BESIDES the (ground short, fuse, wrong tail lamp, tail lamp failure box and dimmer switch) could be the problem.

My suggestion is that there's a break in the circut not allowing power to get to the wire all 3 things draw from. Where could the break in the circut be? I have no way of accessing a multimeter, so that's a no (Until I get paid next week but I really don't have the time to wait.)

So. Could it be something unplugged behind the dash that is breaking the circut? I recall seeing the power for that circut is drawn from the alternator, however the alternator works fine, all the grounds around the manifold and fuse box are good. I can't physically see a problem with the wires around the alternator (No burning scaring or cuts, also nothing I can tell in the engine bay is unplugged.

My question is. Could there be something breaking the circut? Where should I look to find the break?

Any advice would be extremely helpful. I need this vehicle to commute to work and back. Please and thank you gentlemen.
 

CRE

7M-GE + MAFT Pro + T = :D
Oct 24, 2005
3,485
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Denver, CO
The issue is definitely further upstream of the cluster and the tail lamp failure module. If there's no power at the fuse then you need to inspect the SOURCE for the fuse... so.. look at the tail lamp relay and the integration relay. Ground the Green wire with the white stripe that runs to the integration relay to see if the relay is functioning properly.

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=062

The integration relay controls the tail lamp relay... if it's bad none of the lights you mentioned will work as there's no power reaching the fuse. If the relay doesn't close when jumpered then the relay needs replaced.

I'll get back to you with my paypal address. ;)
 

suprarx7nut

YotaMD.com author
Nov 10, 2006
3,811
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Arizona
www.supramania.com
CRE;1450592 said:
I wasn't offered money the first time. :naughty:

Oh capitalism at work. Good stuff. ;)

I'd pull the fuse box and check the connections at the back. I've had similar problems with other cars where the connectors on the back simply weren't in all the way. :dunno:
 

supraduper

New Member
Jun 7, 2009
126
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merrimack nh
not to sound like a dick, but how can you check any electrical system without a multimeter/power probe or test light?

furthermore how do you know theres no power to the fuse?

without a test light?

and for reference, the dimmer switch is involved in the circuit..

i have had a bad dimmer switch cause me to lose all tails and instument lights....

IMO

without a test light, its like trying to make bread with an easy bake oven and playdoh
 

Bootymeat

Banned
Nov 4, 2009
51
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Bev Hills 90210
Jumped a +12 volt to the tail fuse and WHALA!!!

However, I replaced the tail lamp relay and nothing.

Where the hell is the integration relay #2 as shown on the TEWD?
 

Bootymeat

Banned
Nov 4, 2009
51
0
0
Bev Hills 90210
supraduper;1450785 said:
not to sound like a dick, but how can you check any electrical system without a multimeter/power probe or test light?

furthermore how do you know theres no power to the fuse?

without a test light?

and for reference, the dimmer switch is involved in the circuit..

i have had a bad dimmer switch cause me to lose all tails and instument lights....

IMO

without a test light, its like trying to make bread with an easy bake oven and playdoh

I know there's no power to the fuse, because when I hot wire the fuse with a +12 volt source the lights come on.. :nono:

I agree I need a multimeter, but I can't get my hands on one. I've narrowed it down to the intigration relay but can't figure out exactly where it is.

I know it's not my dimmer switch because when I hot wire the "tail15a" fuse, the dash lights illuminate and they dimmer and brighten when I turn the knob to the switch.
 

KicknAsphlt

Occasional Peruser
If the dash was replaced, sounds to me like maybe a wire got pinched somewhere during the installation. If the wire that supplies voltage to that circuit, or any wire with the same voltage source gets pinched between the dash and the chassis, it will short the circuit out and your instruments won't get any juice.

Follow the circuit back in a half-split bracketing method; test the output of the circuit...if there's no juice (I know, evident by non-working lights), then test the output of the midpoint of the path. If you have voltage at the midpoint, the fault is between the midpoint and the output. If there's no output at the midpoint, then it's still upstream....go to the next midpoint (halfway between the source and the midpoint of the entire path) and check for voltage. Keep repeating this process until you find the fault.
 
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