HELP - Rear fog light switch wiring

gordonlear · Post by **gordonlear** » Sun Jun 08, 2014 1:10 pm

I want to wire up a OEM rear fog light switch. My current not standard one only has 3 wires, earth, lights and fog lights.
The one I have from Honda has 5 wires as per picture below. Where do they all connect to?

andypont · Post by **andypont** » Sun Jun 08, 2014 3:03 pm

I have never been able to find a UKDM wiring diagram, but if nobody else can help in the next couple of hours I'll go out to my car with a meter and trace the wiring.

andypont · Post by **andypont** » Sun Jun 08, 2014 5:10 pm

Sorry I cant help. I put my meter across the pins and found that theres one pair connected all of the time but none appear to be connecting with the switch operation. Confused for a few minutes I kept checking different pairs before powering it up to actually try it and finding that my fog doesn't light up!

Anyone have a switch to sell me?

gordonlear · Post by **gordonlear** » Sun Jun 08, 2014 7:53 pm

Thanks for trying.

gordonlear · Post by **gordonlear** » Wed Jun 11, 2014 9:50 pm

Bump

gordonlear · Post by **gordonlear** » Sun Jun 15, 2014 12:31 pm

Someone must know the answer surely...........

The "S" express · Post by **honda-hardy** » Sun Jun 15, 2014 4:38 pm

I tried yesterday to find out what wires are what on mine, but all I kept on doing was blowing my sidelight fuse.

gordonlear · Post by **gordonlear** » Sun Jun 22, 2014 8:17 pm

Still looking for help on this one.

andypont · Post by **andypont** » Sun Jun 22, 2014 9:56 pm

Not sure this will be exactly what you need as I am a bit uncertain about the fog light circuit. I expected this to be a latching switch but it isn't. In other words the wires connected by operation of the switch are only connected whilst the switch is pressed. The signal must operate a latching relay that keeps the power on while required. However, I can tell you which pins are connected.
Assuming that Pin 1 is at the top (which is central to the switch body) - Red / Blue wire
Pin 2 - Black
Pin 3 - Red / Black
Pin 4 - Blue / White
Pin 5 - Red
Pins 1 & 2 and pins 3 & 5 make a circuit whilst the bulbs are in place. Pins 1 & 4 make a circuit whilst the switch is pressed.
Therefore (and I cant guarantee this so don't blame me if you blow fuses

) I believe that Pin 1 is the feed to the relay. Pin 2 is the earth from 'switch on' bulb, Pins 3 & 5 are the switch illumination (from your sidelight circuit) Pin 4 is the power from the ignition. I hope that's of some help @gordonlear.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sun Jun 22, 2014 10:09 pm

Page 23-237 of the 4th gen manual;

And page 23-232 of the same;