Ok, I've been going through every relay in the '88 FC wiring diagram trying to find this sucker and I'm running out of patience. It's a regular 4 pin relay bolted right behind the passenger's side headlight on the core support. The 4 pin plug has B, B/W, Br/Y and R/Y wires. The B wire appears to be a ground. It's not related to the AC, PS or headlights. Any ideas?

 

I heard somewhere in aother thread that it was the headlight relay.

 

It's not the healight relay. The headlight relay is up front in the middle along with the dimmer (high/low beam), AC, PS and electric fan relays.

My car is an '87 and I'm starting to feel that this relay doesn't exist in the '88 wiring diagram.

 

That is a headlight retractor relay to the best of my memory. I'll double check.

EDIT: Let's say I don't know for right now. If you have a similar relay on the drivers side, I'd say it's the retractor relay. If you don't have a similar relay on the drivers side,then it could be the air bypass relay. I'm going to hunt up some jps of the retractor relay I've posted in the past. I'll be back later.

 

THAT'S what I was thinking of.

Not just the standard "headlight relay". My bad.

 

I just got finished looking in the FSM as well and did not find ANYTHING about a headlight retractor relay. BTW...I was lookin in the 86-88 FSM.

 

The headlight motor relays are actually built into the motor assemblies. The relay behind the passenger's side headlight is disconnected and the headlights still go up and down.

In the '88 FSM on page 50-114 is the front harness. On the upper right hand side it shows everything that comes out of the front harness on the right front corner of the car including the headlight, headlight motor, turn signal, marker light, washer motor and level sensor. This mystery relay's connector comes out of the harness in the same place as everything else I listed, but this relay isn't there.

 

I'm sure this time. On a non turbo car its a Air Bypass Relay. See page 50-31 of the 88fsm that is online.

 

We have a winner! Thank you so very much! Now I can sleep at night.

 

Good job Hailers! Good job!

I can barely read that damned s4 FSM online....the S5 one is sooo much cleaner and easier to read. Lucky s5'ers