Reversing Wiper On?

[ardandy 0]

Nearly every modernish car I've driven has had the function, so when you put the car in reverse with your wipers on, the rear wiper will come on automatically.

 

Is this a simple thing to do, or does it mean a lot of tinkering for a little mod?

[carpy25 0]

Should be easy you have to take a live feed from the reverse light to the trigger on the rear wiper relay but you need to put in a one way diode so that when you put the rear wiper on (while not in reverse )the reversing lights do not come on

 

long piece of wire and a one way diode plus a few conectors is all you need cheap and not a lot work

 

 

Rob

[gsbellew 0]

To do it right so it only comes on when you have the front wipers on and shift into reverse you would need to use two 4 pin relays.

 

 

Wired as follows:

 

R1 = Relay 1

R2 = Relay 2

 

A feed from the reversing lights goes to pin no 86 on R1

pin 85 on R1 to ground

pin 30 on R1 to an ignition live feed via an inline fuse

pin 87 on R1 goes to pin 30 on R2

Pin 86 on R2 goes to the front wiper relay output

Pin 85 on R2 goes to ground

Pin 87 on R2 goes to the rear wiper relay input.

 

The above circuit while being slightly more complicated cuts out feedback and means that the rear wiper will only automatically come on with reverse and the front wipers on / on its own switch as normal.