owen23

I pulled out the ICU due to my turn signals/ wipers not working (my emergency flashers work). I noticed there is one plug (orange) that does not connect to anything and I cant find the location of the female end. Is there a jumper harness that I am missing or something? There are empty sockets in the ICU.



When I traced some of the wires from the orange plug they go to the plug in the ICU that the emergency flasher plug goes to so id assume that the orange plug is my issue?



please help?

Former User

Wipers - Have you checked 15A dash fuse 13?

Blinkers - Have you checked 10A dash fuse 1?

owen23

Yes I have done the basic troubleshooting and checked all the fuses as well as changed out the wiper and turn signal levers.

I was looking at this thread and it seems he had similar problems. There was never a solid answer to the problem, other than the one at the end that stated to change out the whole ICU.

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/crx-turn-signal-problems-2791340/

Former User

Blinkers - See diagram. Do the terminal B and terminal B and L tests for the blinkers.

Wipers - Do motor tests in diagram.

Do you have a multimeter?

owen23

I do not have a multimeter. Just checked the wiper motor and its good.

When I connect B+L +hazard switch the indicators go solid and do not blink so its getting power and ground (when I add the fuse is in it blinks) and when I connect B+L and turn the signal (L) or (R) nothing happens.

I already replaced the signal and wiper levers as stated above, they were both pulled at the junkyard. If it was just one that was malfunctioning I would just chalk it up to a junk part....but its both.

And thank you for your responses RonJ

Former User

On sale, you can buy a digital multimeter from Harbor Freight Tools for $4.

1. Unplug the wiper motor connector.
2. Turn key to ON(II).
3. Check whether terminal B in the unplugged motor connector has battery voltage to body ground.

You found an important problem.

Next test:

With key in ON(II), test for battery voltage to body ground at terminal B in the relay socket, as described in the diagram.

No

owen23

I forgot I bought a cheap one at harbor freight a few months ago.

With the ignition at (II) terminal B has power (12.5v) but when I trace it to the wiper motor plug it does not have power. If the big black fuse is damaged would the emergency flashers work but fail to work the other components?

I have a basic understanding when it comes to wiring, and as you've probably already noticed wiring is my kryptonite.

Former User

I don't follow. Are you referring to terminal B in the blinker relay socket or terminal B in the wiper motor socket. Please state results for each separately.

No worries. I can help you with any tests or questions you have.

Former User

The blinkers and hazards have different power sources, so one can work and the other not.

The blinker and wiper problems may be unrelated, separate issues. Results from a few electrical tests should pinpoint the problem(s).

owen23

Terminal B in the blinker relay socket has power while the ignition is at (II) with the fuse removed (12.4-12.5v).

I installed the fuse.

Terminal B in the wiper motor socket does not have power while the ignition is at (II).

I switched the fuse with the one out of my Ek to try and narrow things down. The ek's signals work with the questionable fuse the Ef does not (if that helps any).

Former User

Very good.

When you say fuse, you must actually mean relay. The fact that the hazards work already tells you that the relay is fine.

I'll describe new tests to do in my next post.

Former User

Blinkers:

1. Unplug the blinker switch
2. Remove the blinker relay
3. Short terminal B to terminal L in the blinker relay socket, as you did before
4. In the unplugged blinker switch connector, measure voltage to body ground at terminal A (Grn/Red wire) with the key in ON(II).
5. What's the reading?

Wipers - Voltage test installed 15A dash fuse 13. Click the Test Fuses link in my signature.

owen23

The reading at terminal A (Grn/Red wire) is 0.

I ran a hot wire from the battery to terminal a to see if it "got power" would it work; but it did not (it did make a clicking noise every time I connected it though). Could it be a ground issue?

I did the fuse test at fuse 13 and its good to go at 12.5v on both sides.

Former User

At this point, your test results suggest that the problems are caused by two broken wires:

Blinkers - The Grn/Red wire (corresponding to relay socket terminal L) that runs from the dash fuse box to the turn signal switch connector may be broken.

Wipers - The Grn/Blk wire that runs from fuse 13 in the dash fuse box to the terminal B of the wiper motor connector may be broken.

Another possibility is that the dash fuse box is bad.

There are more tests that can be done in an attempt to verify and pinpoint the wire breaks.

Are you up for more tests?

owen23

Yes Sir I am. I don't expect to be spoon fed anything, and do appreciate your time. Id rather not waste my money on a new ICU if I don't have to, even though it is a decent enough excuse to go to the junkyard.

I do not have time to un-loom the harness tonight or I would.

Do you know what the orange plug belongs in my first photo? I know it has some ignition wires on it as the car was hotwired to bypass the broken ignition switch when I bought it. I cleaned it up the best I could until I can get another complete ig switch, locks, and keys from the junkyard.

Former User

Are you able to locate the Grn/Red and Grn/Blk wires in the connector(s) that plug into the front or rear of the dash fuse box?

Former User

Not sure. It looks like a previous owners project, possibly for an alarm system?

I also attached a diagram for the ignition switch.

owen23

It belonged to a old Mexican guy who was a mechanic for one of those sleazy dealerships that rip off servicemen. I bought it for $700 because it probably would have ended up in the junkyard, there was a lot of stuff rigged up on it.

I believe this is the green and red wire that goes to the turn signal switch connector . I double checked the voltage and its 7.8v at both the turn signal switch connector as well as the back of the dash fuse box now...I need a better multimeter as I checked it like 5 times using the method you stated and it didn't have power.

Former User

What is the signal indicator plug?

Did you do the voltage tests above with terminal B shorted to L and the key in ON(II)? Or did you test differently?

Former User

A bad ICU would not cause the blinker or wiper problem you are having, but please go on the junk yard adventure regardless.

owen23

corrected:turn signal switch connector, and no I did it with the relay installed with the ignition on (II). It looks like I will be un-looming it soon then.

Former User

I would retry this^ test with B shorted to L to see if you get closer to a battery voltage reading. Maybe B was not well shorted to L in previous tests?

Also check whether the blinkers now work.

owen23

I repeated the test with b shorted to L. Im at 12v at the turn signal switch connector but the signals still do not work.

I ran a 12v wire from the battery to the blue/yellow and blue wires on the wiper switch connector. The Switch controlled the wipers but only when I ran the hot wire directly to the individual function, slow/fast/wiper fluid. The wipers were weak. (don't know if that helps)

I know running straight 12v to the switch is probably not the best thing for it, but now I know the wiper switch works.

Im done for tonight, I have to pack to leave for Oklahoma in the morning I will not be taking the EF because I don't feel like
for 18 hours.

THANK YOU RONJ! Ill update this when I get back so hopefully this thread can someone else and not just take up space...... I hope i get this figured out.

Former User

Very good. The next steps are to test the blinker switch and its left and right ground wires.

You ran voltage backwards in the motor circuit through the motor ground wires. The wiper switch controls ground not voltage to the motor.

Have safe trip.

RanCRX

You should pop open the ICU case and see if the chip is burnt as well. I had to scavenge (the same part #) the icu from a 88-91 civic or crx or 1990-91 Integra. They all carry the same icu's. Can't help with the wiring though