nexpo8

hello i'm having trouble with my 91 rx7; light switch harness. so imma have to replace it with another one. but im wondering what does this wire do? i looked at the FSM but i cant find it..

nexpo8

p.s
the white/grn one. it burnt out the harness.

satch

iTrader: (1)

W/G supplies constant voltage to the headlight switch and is powered by the 15 amp Illumination fuse.

HAILERS2

Usually that wire will be found burnt to a crisp inside the headlight switch elect plug more or less indicating a bad switch and or bad short harness to the switch.

IF the switch is bad you don't have to buy a new/used good one. ICEMARK had a thread where he advised using a store bought relay to overcome this bad switch problem.

The idea of the relay being that the contacts in the switch draw too much current 'cause their corrupt, BUT if the green/white wire passes power thur the switch and this power is used ONLY to power a relay, then the g/w won't burn up like yours seems to have done. Something like that.

nexpo8

Well the switch seems to work. It turns on the headlights on but not flip them and i have no taillights either.open. So i have to just change the switch or the light switch? harness

nexpo8

Hmm lemme look for that icemark thread

satch

iTrader: (1)

Check the Retractor fuse in the engine fuse box. You need voltage on the W/G wire in addition to the switch contact being good to turn on the tail lights.

HAILERS2

Check you HEAD fuse in the engine bay also. Look at the attachment in my other post. See the red wire from the HEAD fuse goes into the switch. It passes thru a relay and if that relay is pulled in when you turn the switch to ON, then power from the red wire passes thru the relay and goes out of the switch on the R/Y wire and makes the retract motors go UP.

The G/W wire has absolutley noting to do with the motors going up/down. When you put the switch to ON, that relay I just spoke about above pulls in. When you put the switch to ON, you put a Ground on that relay which already has power to it.........so it now pulls in and passes power from the red wire to the R/Y and the motors come up.

Is this series four or five car? Series five have something not shown in the series five schematic I attached and that has something to do with the CPU and Theft protection.

Like Satch said, the Retract fuse in the engine bay powers the motors. But the Control comes from the way I just described above............on a series four car.

nexpo8

Its an s5. Imma have to look at it in the morning. See i baught the car a couple of months ago and it was giving me a hesitation problem. I cleaned out almost all grounds on the car and it still didnt go away. So i was curious and look at my gauges/ switch and i noticed on the light switch; W/G wire was burnt. And i seen that the red/ black wire and the red/green wire were twisted together...i have no idea y they were like that but i put them back how the were. N now this problem happend. You think that couldve been the problem? The previous owner (i think) was trying to band aid it and not get it fully fixed.

Also any idea what the red/blk and red/grn wire do?

satch

iTrader: (1)

When the **** is turned to the first position the voltage on the W/G wire passes onto the R/B wire and the tails come on. Turn the **** to the next position and the W/G voltage passes onto the R/G wire which causes the various dash lights to turn on.

HAILERS2

Yeah it sounds like he was trying to sort of fix something to do with the side/tail lights not working. It does not explain the headlight assys not coming up imho. White/green, red / black and red/green.

When you turn your headlights on and they don't come up..............do you know if the headlights are coming on or not?

You do know about the **** below the headlight assys that you can turn to make them come up or go down manually. Right?

nexpo8

Yes they do turn on. And i had to dissconnect the motors because if not, when i turn the lights on. They will go back down.

So i just checked the HEAD duse under the hood and its fine...

satch

iTrader: (1)

You could place a ground on the R/W wire in the plug w/the damaged W/G wire and see if this causes the retractor to pop up the lights. If they stay in the up position then one of the contacts in the switch is damaged.

nexpo8

Ok just b4 i cut ir, you ment the red with white strip right?

satch

iTrader: (1)

Don't cut the wire!!!!!!!!!!!!!! Just take a jumper wire and place one end of it into the back of the plug where the Red/White wire resides and the other end of the jumper wire to a suitable ground like the Black wire found in the very same plug. Easy said,easy to do.

nexpo8

Just did what you said and the lights turned on and off but not pop up

satch

iTrader: (1)

Try jumpering the Red wire to the Red/Blue wire found in the same plug and this should cause the lights to pop up. This bypasses the internal switch relay and should tell you what exactly is the cause of your problem, which is most likely the switch.

nexpo8

Lmao the open up and down crazy

satch

iTrader: (1)

Are you doing these tests w/the headlight harness connected to the headlight switch or not connected?

nexpo8

Connected and dissconnected. I tried both just incase.

satch

iTrader: (1)

If the last jumper test was done w/o it being connected then there appears to be a problem w/the retractors themselves in addition to the switch being damaged.

Edit: When you disconnected the retractors did you unplug a connector which had a Red/Blue wire and a Red/Yellow wire?

nexpo8

[QUOTE=satch;10720254]Try jumpering the Red wire to the Red/Blue wire found in the same plug and this should cause the lights to pop up. This bypasses the internal switch relay and should tell you what exactly is the cause of your problem, which is most likely the switch.

Ok i did this with the switch not connected to the harness and they stayed poped up.

nexpo8

If its the switch, is there anyway i can bypass it just for today? I need my taillights and my illumination in the gauges. Im looking for a switch as ee speak.

HAILERS2

White/green jumpered to R/B will get you tail/side lights

I misspoke in post 8 when I said jumpering to R/Y would make 'em come up. OOps.wrong wire. R/Y is down..

nexpo8

I jus jumpered the white/green wire to the red/blue wire and it made my head lights pop up with lights on, but still no tail lights. (with it being connected to switch)