Wiper switch rebuilds

Pele · 01-22-2010, 01:23 PM

Both S4s and S5s are subject to the problem... Here's a quick synopsis of the problem:

There are two relays in the switch. One is for parking the wipers at the bottom of the glass, the other is for high/low speed selection. (There is a 3rd relay in rear wiper cars.) The main problem with these switches is that the relays are rated at the exact amount of power that the wiper motor takes. The relays are in a case that is two pieces put together. Since it's two pieces, there is a split between the two parts and that allows moisture to get in. The moisture corrodes the contacts inside the relay and breaks them down. In the end they do not pass power to the wiper motor.

The updated relays are completely sealed and are rated a for a little higher than the old relays.

I will try and post up a pic later...

If you have the proper equipment, you can desolder the relays and add in new ones... However I caution you that the board is 20+ years old. It is very easy to toast the circuit board and turn the switch into a melted pile of crap.

If you have board level soldering experience. It's fairly straight forward.

You'll need the following relay part numbers:
Z950-ND - (2 for rear wiper cars, 1 if you don't have a rear wiper)
Z1012-ND (Only 1 needed)

It'll take about an hour to dismantle the switch and an hour to put it back together if you do it properly... Or you can cut the hell out of the plastic covering. But that just looks unprofessional and kinda crappy.

I started doing the FC electronics repair since I bought an FC last year with the wiper and headlight switch problems.

Since Icemark passed last year, I have also been doing the repairs for others. I am an electronics technician for my day job, and have a fully equipped electronics workbench both at home and at my work place. I have temperature controlled soldering irons, vacuum powered automatic desoldering equipment, and silver epoxy for damaged circuit board repair.

PM me if you want me to deal with your switch.

01-22-2010, 01:23 PM	#16
Pele The Newbie Join Date: Jan 2010 iTrader: (0) Posts: 8 Rep Power: 0	Both S4s and S5s are subject to the problem... Here's a quick synopsis of the problem: There are two relays in the switch. One is for parking the wipers at the bottom of the glass, the other is for high/low speed selection. (There is a 3rd relay in rear wiper cars.) The main problem with these switches is that the relays are rated at the exact amount of power that the wiper motor takes. The relays are in a case that is two pieces put together. Since it's two pieces, there is a split between the two parts and that allows moisture to get in. The moisture corrodes the contacts inside the relay and breaks them down. In the end they do not pass power to the wiper motor. The updated relays are completely sealed and are rated a for a little higher than the old relays. I will try and post up a pic later... If you have the proper equipment, you can desolder the relays and add in new ones... However I caution you that the board is 20+ years old. It is very easy to toast the circuit board and turn the switch into a melted pile of crap. If you have board level soldering experience. It's fairly straight forward. You'll need the following relay part numbers: Z950-ND - (2 for rear wiper cars, 1 if you don't have a rear wiper) Z1012-ND (Only 1 needed) It'll take about an hour to dismantle the switch and an hour to put it back together if you do it properly... Or you can cut the hell out of the plastic covering. But that just looks unprofessional and kinda crappy. I started doing the FC electronics repair since I bought an FC last year with the wiper and headlight switch problems. Since Icemark passed last year, I have also been doing the repairs for others. I am an electronics technician for my day job, and have a fully equipped electronics workbench both at home and at my work place. I have temperature controlled soldering irons, vacuum powered automatic desoldering equipment, and silver epoxy for damaged circuit board repair. PM me if you want me to deal with your switch.