Hey guys. I know you’re going to tell me to search, but I have for the last two days. I saw several threads with the same problems as mine, and I’ve checked all of their fixes. None of them has worked for me.
To clarify, it’s a 91 GS with JDM headlights, and the fogs are wired to come on with the headlights. It also has an NRG Ground Kit and all of connections are tight and clean. I bought the car about 5 months ago and it has never given me a single issue. Two nights ago, I was driving a to a friends and stopped at 7-11. I never cut the car off, just the lights and ran inside. I came back out, flipped the lights, and voila. No tails, fogs or corners, and instrument lights. The headlights, brake lights, reverse all work fine, just no running taillights.
I checked all the fuses 3 times now, visually and with a meter for continuity. Not a single fuse was blown. I even replaced 11- 15A just for the hell of it, and stll nothing. There was an aftermarket headunit with some pretty nasty connections, but I completely chopped the OEM radio connector off (beyond the crap connections) so I can solder in a new connector. Even if it was shorted from this, I would think it would have blown a fuse. But nothing. I also did a continuity check on every exterior bulb that isn’t working, and they all passed.
I’m starting to lean towards the ICU. However, I’ve dealt with a faulty ICU before and there were plenty of symptoms like the door chime and headllight delay. And those issues were intermittent. This car has had zero symptoms of a bad ICU until now, and the problem isn’t intermittent. I’d find it odd if it just went out like that.
Thanks in advance guys, esp. you FCM. (Sorry for the novel.)
Just got back from the junkyard. It’s not the ICU.
Could have told you that, the ICU only controls the front side markers.
Obviously fuse 33 - 50A, [main park/head light fuse] is good, as head lights work.
You said you tested and even replaced fuse 11 -15A, [park light fuse] did you check to see if there is power at fuse 11 when you turn on the park/head lights?
You also said the fog lights are “wired to come on with the headlights” does that mean they have not been rewired, if so the fog light switch is fused at fuse 4 - 10A, [left head light low beam fuse] and if head lights work, the fuse is not the problem, have you checked the fog light fuse itself, fuse 19 - 15A, [hot at all times] in under dash fuse box?
You have not said if the signal and hazard lights work or not, and if the front side markers work with the signal and hazard lights.
Check for power at fuse 11 with park/head light switch on, if no power , check for power on the red/green lead at the head light switch, [with park/head light switch on] if no power, replace the light switch.:whisper:94
Thanks for the advice! I havent checked for power at fuse 11 -15a, so I’ll do that first thing in the morning. I did check all the underhood fuses for continuity and they passed. It’s not a fuse and I can’t find any broken grounds.
The signal/hazard lights work properly when flashing. The front side markers only work with the signal/hazards, they don’t stay lit up.
At least I ended up with a spare ICU
Edit - A few more weird symptoms. Everytime I cut my car off, and then back on, the clock resets itself to 1:00. Also, with the ignition on (car not running), the instrument cluster’s warning lights work. However, when I turn on a map light, the trunk and door ajar warning lights go out, as well as the clock. Freaking weird.
Update. Checked for power at fuse 11, and had nothing. Removed the steering wheel and did voltage checks at the headlamp switch. There were five wires and this is what I got, with the headlights on.
Red/yellow- 12v
White - 12v
White - 12v
Red/blue - 2.2v
Red/green - Ov (zero)
Looks like I’m on my back to the junkyard. Quick question though. What would cause the Red w/blue to be at 2.2v? Also, on the connector itself, I noticed some browning on the left three terminals. (red/yellow, white, and red/green)
Seriously this was all cause of your switch. I don’t have instrument cluster or any of the lights that light up the dash stuff like the blower controls. The tailights are bypassed from the stock harness and go straight to the back lights. Its either tails or turn signals. I do have ebay jdm headlights. I didn’t install them so who know’s what wrong.
Not sure I understand, your dash lights and park lights, [tail lights] are one circuit and your signal lights are on another circuit, so exactly what do you mean be,
The taillights are bypassed from the stock harness and go straight to the back lights.
Its ok I gave in and put in some little L.E.D. lights that plug into the cigarette lighter and has a built in on off switch. It looks good. I’ll work on getting pics. The hardest thing to do was get the most light out of them. I know it doesn’t take care of my problem. I have a cut wire or something somewhere. I I have power at the fuse box but no power at the dimmer switch. I guess I’ll have to look for a relay between there or something. The cluster is not getting illumination power either. I even jumped power from the fuse box to the cluster and the lights didn’t light up. So I said forget it.
Would the integrated control unit cause any of these problems? I checked the FSM and the wiring diagram shows power going into that unit on its way to the dimmer switch. Cause there’s power at fuse 11 but not at the dimmer so the problem is somewhere between. Is the control unit behind/on the back side of the fuse block. Thats what the FSM makes it look like?
If by “dimmer” you mean the Dashlights Brightness Controller, the DBC controls the ground to the dash lights, [red lead] not the power, test the red/black lead at the DBC for power when the park/head lights are on, red/black is power for the illumination bulb in the DBC switch.
Black is ground input to the switch.
Red is ground output from switch to dash lights.
Red/black is 12V+ input to switches illumination bulb.
Does your glove box light work, [if park/head lights are on]?
Does the readout on your clock dim when you turn on the park/head lights?
If you still have the stock radio does the readout on it dim when you turn on the park/head lights?:hmm:94
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