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Giant turn signal issue

PostPosted: Wed Mar 15, 2017 11:36 am
by Pancak3e_batter
1991 Crx Si w/ b20b, gsr trans & tuned obd1 Ecu.

Months ago my turn signal side bulb went out, the one next to the running light, so I upgraded it to led. Few months later the other went out, so I did the same. Drove like that for a few weeks, then I noticed something odd. When I use the left signal, all the lefts go off normally. When I use the right, all rights go off except the side marker, and the left one goes off in its place. So basically when I use the right, the left side goes off.

So I replaced all the fuses, and the relays, and installed resistors, and the turnsignal hazard switch even the turn signal/headlight combination switch. Same issue.

I removed the resistors and installed the factory bulbs, same thing.

The interesting part is, with the resistors in, the right goes off as normal, but very quickly. And the left goes off normally but very dim.


So what do I do next?

Re: Giant turn signal issue

PostPosted: Thu Mar 16, 2017 6:13 pm
by jfrolang
Could be a burnt-up ICU. When mine fried it caused funky turn signal issues like you describe. The ICU is a box on the back side of the fuse box under the dash, about the size of a deck of playing cards.

There's a pic of a bad one in this thread, showing typical burnt traces: http://www.crxcommunity.com/viewtopic.php?t=113986

Re: Giant turn signal issue

PostPosted: Sun Mar 19, 2017 1:15 pm
by Pancak3e_batter
That was it, icu was burned worse than in the tagged topic. I have a parts crx here but the icu in it is screwed up, and so is the fuse box. And I accidentally broke my own fuse box being dumb. What could I pull both parts out of? I'm in va crxs are hard to find here. I'd assume 89-91 hatchs but what else may work to make my hunt easier?

Re: Giant turn signal issue

PostPosted: Mon Mar 20, 2017 2:41 pm
by jfrolang
You can try the 90-91 hatchbacks or maybe other 90-91 Civics. I know there are at least two ICU variants for the CRX, and as I recall they are split up as 88-89 and 90-91. The case has the part number on it so you can match them up easily. If that fails, post a WTB.

Re: Giant turn signal issue

PostPosted: Tue Mar 21, 2017 1:43 pm
by thaeli
How badly burnt up is it? On mine I had to decarbonize the board, reflow some solder joints, and add a couple jumper wires. Fortunately, the ICU is an old-fashioned single-layer through-hole low-frequency PCB, so trace length really doesn't matter and fixing solder or even switching burnt up components is easy. That being said, it does require basic soldering and desoldering skills.

Which part of VA are you in, by the way?

Re: Giant turn signal issue

PostPosted: Tue Mar 21, 2017 5:01 pm
by Pancak3e_batter
Yeah I used to own a computer store but soldering wasn't ever my thing and after going to five junkyards and finding everyone ripped the box out, I'm gonna pay the $20 to have someone referb it. I appreciate the help guys I had no idea what the issue was but my rat is back together, no more led bulbs ha.

I'm from the Richmond area but house out in the northern neck.