shark

Ok, here is something challenging (for me at least):
I’m trying to figure out why my stop lights wont work. And my horn for that matter.
The image attached is a scan from the 1986 RX7 workshop manual. According to my observations and tests, there has to be something wrong with the CPU unit. I tested the fuses (60 and 20 Amp) and they are fine. I’m also sure that the switch (red color on the picture) is working fine, since when I step on the brake pedal it cancels my cruise control. This leaves me thinking it has to do something with the CPU (I put a ? mark next to it on the picture). Now there’s a drawing of the actual circuit inside the cpu and that’s the part where I am left without a clue. Do you think that the CPU causes all my lights not to work ? (of course I checked the light bulbs). When I press on the horn, it doesn’t work either. One more clue I got from the other circuit drawings : Anythin that doesn’t go thru the CPU works (like the backing up light, turn signals …).
So what do you all think? Thanks for any suggestions.

go_speed_go

Sounds like you need to consider 'the cpu resolder'. I did it a few months ago when I lost my high beams, key & lights-on chime, and the alarm wouldn't arm. After a long day of resoldering every joint, testing and then re-resoldering a few definate week points, everything went back to normal.

I got my instructions from:
http://www.teamfc3s.org/faq/FAQ.html#S2

shark

thanks for the link. i went to check it out and the instructions are really good. I will give it a try this weekend.

jacknghiem

yes from my guess n experience with the 2nd gen rx7...the cpu should be the problem.....how do i know ? cuz i have the same problem....my horn n warning lights dont work....u should take it apart n re solder some of the circuits together.....there is a site that teaches u ...its fairly easy.....