lighting issues

tsupra89 · 09-06-2007, 12:54 AM

ok my name is travis and i just started the forum. i have recently replaced my engine and transmission. in my 89 toyota supra T and my lights are wanting to do something strange that i have never seen before ok.

here is how i slove the problem, when i take the dome fuse out of the engine panel the lights work perfect and the headlight motors and all that and the horn, well when i put the dome fuse back into the panel the lights go haywire. if i turn them to the off position on the multifunction switch the lights turn on and vise versa. and the motors wont work and my horn wants to stay on all the time. well i was wondering if anyone has run into this problem and if so hit me up with some info please.

carfanatic89 · 09-06-2007, 01:09 AM

I think it has to be a wire that is grounding out. Just check the wires and see what you find. Thats about all you can do. Or just leave the fuse out. lol

abhattan · 09-06-2007, 02:15 AM

Check along the circuit that the dome fuse is part of and like he said, check to see if there is anything shorting out. Shouldn't be that hard. I would first look in the engine bay where all the recent work was done. Get a manual for the car. This car has alot of circuits that are intermingled. All because of the damn integration relays it has.

mrnickleye · 09-06-2007, 03:22 AM

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/

dannydavi · 09-06-2007, 04:04 AM

i had a similar problem... kinda.. i used to push my horn and it would activate my lights ?!!?!! didnt know for the life of me what was causing it but didnt mind it cause dont use my horn anyways, anyways it ended up just being wrong fuse in wrong place in in the under hood fuse box.. so maybe even making sure all fuse slots are filled with right fuses i guess, good luck.

cre · 09-06-2007, 05:38 AM

Go ahead and test the line for a short to ground. The difficult part of troubleshooting that particular circuit is the number of devices which receive power from it (clock, radio, security system...).

The first thing I think of after reading your post is the security system.

09-06-2007, 12:54 AM	#1
tsupra89 3" Exhaust Join Date: Sep 2007 Location: asheville Posts: 71	lighting issues ok my name is travis and i just started the forum. i have recently replaced my engine and transmission. in my 89 toyota supra T and my lights are wanting to do something strange that i have never seen before ok. here is how i slove the problem, when i take the dome fuse out of the engine panel the lights work perfect and the headlight motors and all that and the horn, well when i put the dome fuse back into the panel the lights go haywire. if i turn them to the off position on the multifunction switch the lights turn on and vise versa. and the motors wont work and my horn wants to stay on all the time. well i was wondering if anyone has run into this problem and if so hit me up with some info please.

09-06-2007, 02:15 AM	#3
abhattan 3" Exhaust Join Date: Oct 2006 Location: Brentwood, New York Posts: 162	Check along the circuit that the dome fuse is part of and like he said, check to see if there is anything shorting out. Shouldn't be that hard. I would first look in the engine bay where all the recent work was done. Get a manual for the car. This car has alot of circuits that are intermingled. All because of the damn integration relays it has. __________________ '91 Turbo Targa 5 Spd. '87 Corolla GT-S 5 Spd '91 Accord Daily Driver 5 Spd Soon to be rebuilt (All to some extent)

09-06-2007, 03:22 AM	#4
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	http://www.cygnusx1.net/Supra/Library/TEWD/MK3/ __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

09-06-2007, 04:04 AM	#5
dannydavi 12psi boost Join Date: Mar 2007 Location: Sacramento, Ca Posts: 373	i had a similar problem... kinda.. i used to push my horn and it would activate my lights ?!!?!! didnt know for the life of me what was causing it but didnt mind it cause dont use my horn anyways, anyways it ended up just being wrong fuse in wrong place in in the under hood fuse box.. so maybe even making sure all fuse slots are filled with right fuses i guess, good luck. __________________ '86.5 Supra - A/T - N/A - JDM Useful Sites: ToyoDIY.com ToyotaPart.com MKIIITSRM

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09-06-2007, 01:09 AM	#2
carfanatic89 3" Exhaust Join Date: Apr 2007 Location: Waco Posts: 164	I think it has to be a wire that is grounding out. Just check the wires and see what you find. Thats about all you can do. Or just leave the fuse out. lol

09-06-2007, 05:38 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Go ahead and test the line for a short to ground. The difficult part of troubleshooting that particular circuit is the number of devices which receive power from it (clock, radio, security system...). The first thing I think of after reading your post is the security system.