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View Full Version : 90 Civic - Main Relay Swap


Ran
07-07-2008, 12:18 PM
Can anyone give me some instructions on how to swap the main relay in a 90 Civic? My girlfriend's car is still being tempermental when starting and I've heard that this is a common problem.
Ran
07-07-2008, 01:24 PM
Okay, so I went by the ricer pitstop (Pep Boys) and they have two "Main Relays" on file. I got a picture of each. Which one am I looking for?

Switch 1 - Smaller, no rubber casing.

Switch 2 - Larger, rubber casing, mounting bracket.
Vteckidd
07-07-2008, 01:32 PM
thats not either of them

Where are you located, i can fixi t.

The main relay is held in by a 10mm under the driver side of the dashboard. youll have to get on your back to find it, its around the hood release latch.

Its a ***** to get out, you need a 10mm gear wrench.

Its a black box that says MITSUBA on it.

YOu can get a replacement used for around $20, i think at the dealer its like $40.

Dont buy from Pep boys
b17a1db2
07-07-2008, 01:35 PM
neither, it's under your dash on the drivers side, off to the left side... looks like this:
Vteckidd
07-07-2008, 01:35 PM
Pic

http://nhkniyokoso.com/electrical/mainrelay2.jpg

Heres a general HOW TO

http://www.tegger.com/hondafaq/mainrelay.html

Also, if her car is having trouble starting, bang on the dash by your leg, it will usually get it to start
Ran
07-07-2008, 01:35 PM
thats not either of them

Where are you located, i can fixi t.

The main relay is held in by a 10mm under the driver side of the dashboard. youll have to get on your back to find it, its around the hood release latch.

Its a ***** to get out, you need a 10mm gear wrench.

Its a black box that says MITSUBA on it.

YOu can get a replacement used for around $20, i think at the dealer its like $40.

Dont buy from Pep boysI'm in Alpharetta, but the car is stranded in Kennesaw. You wouldn't happen to have a part number, would you?
Ran
07-07-2008, 01:36 PM
Pic

http://nhkniyokoso.com/electrical/mainrelay2.jpg

Heres a general HOW TO

http://www.tegger.com/hondafaq/mainrelay.html

Also, if her car is having trouble starting, bang on the dash by your leg, it will usually get it to startI actually just added that page to my favorites. :lmao:
Vteckidd
07-07-2008, 01:36 PM
i can come out an look at it tomorrow, i live in marietta.

Im available anytime 10am-6pm

I have to go to KSU tomorrow anyway, holla at me, ill look at it. I know my way around EFs.
Ran
07-07-2008, 01:40 PM
i can come out an look at it tomorrow, i live in marietta.

Im available anytime 10am-6pm

I have to go to KSU tomorrow anyway, holla at me, ill look at it. I know my way around EFs.I may do that. I'll try to fix it myself tonight since I've got the tools. Just gotta get the part. Thanks!
Ran
07-07-2008, 03:52 PM
Did some looking around and it sounds like I need part RZ-0063. Thanks guys. Hopefully this'll be a quick fix. :)
Ran
07-08-2008, 10:58 AM
Swapped the relay last night. Took about 10 minutes.

1) Remove coin holder / ashtray.

2) Use flathead screwdriver to free zip-tie on wires.

3) Use 10mm ratchet-wrench to undo bracket on relay.

4) Pull relay out through the coin-holder space and swap.

5) Replace and remount relay.

Done.

Car seems to be working better now. I cranked it up here and there over about a 30 minute span. Time will tell.