91 ED civic hatch. Got my lights working, the bumper lights works also but the passenger very corner where it signals doesn’t light up at all anyone knows why? Please help.

 

Bump help

 

did you ever figure this out? having a similar situation. hopefully someone sees this.

 

Pull the bulb out of the fixture and test the fixture with a meter. Make sure the bulb is good. Look for corrosion where the contacts are in the fixture. Light wiring is one of the more simple 12V systems - this should be fairly simple to chase down the issue.

 

can you please tell me what lights are suppose to function when the blinker is on? Also when hazards are on?

 

the corner blinkers are controlled by the ICU (Integrated Control Unit) which is known to overheat and damage pcb traces which in turn can cause those blinkers among other things to do weird stuff or not work. If you know how to solder you install some jumper wires on the damage traces. If your bulb, wiring and fuses are good then it's probably that.

 

yeah I think I got that part about it being the Icu, problem is I think I crossed some wires while doing wire tuck. So if you can just simply tell me what lights come on with signals, is it both corner and bumper or just the corner or bumper.

 

yes both the bumper and corners are blinkers

 

so both should blink at the same time when turning left or right, correct? How about hazards, all 4 come on in the front?

 

​​​​​​It depends. If the head lights switch is on the bumper lights and corner alternate flash. If the switch is off then they flash at the same time. Remember the bumper lights are on a different circuit

 

Awesome info and are you 100positively sure? Just asking before I start pulling my tick again and looking for that break. Appreciate you very much. Now all I need is the color of wires that correspond. I have a 91 si in case.

 

I asked timothy to chime in from another similar post, he seems to think only corners blink when signaling.

 

not unless yours is different from an 89 civic. I doubt it

 

Ah ok that’s probably what he’s thinking since I never told him, but yeah I have a 91 si.

 

Looks like I need a new ICU, Anyone have one?

Icu B style

 

it's easy to fix. Hard to tell from the picture, can you see a broken trace? The charred material is the pcb solder mask. You can scratch it off to expose the copper trace. It's only a problem if the trace is broken. Use an ohm meter to check continuity to check those traces.

 

can you tell now?

Would you like to repair for me I’m not that tech savvy.

 

I actually don't see broken traces. How's the other side look?

 

here you go:

 

visually I don't see anything wrong with it. Do you have the service manual? If you have a multi meter it shows you how to test the ICU to be sure that it's actually the problem.

 

only have this

 

check. the procedure should be there

 

Yeah mo where does it tell me how to check icu with meter, just simple check fuses, replace flasher, etc. this is really frustrating, I seen somewhere where you can use a 91 integra DA icu and I went to the yard and got one but can’t find the thread.

 

here

 

thank you , I will sure get on it tomorrow .