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Wipers Relays and Washers query?

19K views 12 replies 4 participants last post by  Dary  
#1 ·
Hi all

I'm having issues with my wipers and washers, and initially i suspected the stalk.

I tried a replacement but sadly that was a pile of crap so not very useful.

I have mid and fast speed control, and intermittent wipers so long as i flick the stalk into its sweet spot, so i know that the internal contacts are worn, and a new switch will have to be bought.

But, whilst testing stuff out, i can hear and audible click within the dashboard below the steering column, but can i heck as like locate the wiper relay itself.

Can someone confirm i'm not going crazy, is it contained in the black box of magic in the right side of the column cavity? (pictured)

and if so, is this a body control module, and what else is it responsible for?

Could this module contain a controller for the washer jet motor?

My wiper stalk connection check out for operating that washer jet circuit, and i'm about to prove the motor itself very shortly (when it stops raining!)

Any wiring, circuit device location info would be very very useful please (07 Vivaro, with OnBoardComputer switch on the stalk)

Thanks in advance

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#2 ·
The washer motor is fed directly from the switch, Grey wire positive, this wire also has a constant negative feed (when not pressed) and is linked into the BCM, so that the wipers operate when the washers are activated.
The negative to the washer pump comes from the Violet wire, this shown to come from the switch also but is connected to the rear wiper/wipe part of the switch so may just run to earth if this is not there.
 
#3 · (Edited)
Hi

so grey wire off the back of the stalk should show bat/voltage when triggered yes?

actually, the doubled up grey with red tracer as pictured?

and the violet with red tracer doubled up with a white with red tracer as pictured 2ndly yes?

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#4 ·
Yes! the two Greys are one to washer motor, one to BCM, should show negative constant, positive when washer button pressed.
Violet only shown as coming from switch but is direct negative feed to washer motor (no white shown on drawing going to switch)
 
#13 ·
Hi mate. I noticed you know the colors of the wires. By any chance can you tell me what is the wire that comes out of the UCH for the ECU on vivaro 2.0 cdti 2012 Ecd17c42 bosch 0281 018497deu? Thank you
 
#5 ·
Right, multimeter out. Paper clip in the grey wired terminal, meter grounded on the bare column steelwork.

Pull stalk. No register, nothing.

So just a duff stalk switch?


I've split mine, and cant see how it fails to be honest, its a simple enough copper bar normally closed in relaxed position, then opens that circuit to contact another when stalk is pulled.

Oddly, metering through the terminals for continuity of that bar contact, it would appear to work, so i wonder if it isnt getting its supply voltage because of the wiper speed selector circuit issues?


Are you able to put up a pin out diagram of the stalk connection please?
 
#8 ·
Check both Yellow wire feeds in, have 12v (from fuse 18, 15A centre row 5 down). if not, check fuse, if fuse is OK, check wiring.
Check negative output on Grey, Check changes to 12v when switch activated. if no negative, check negative input on Black wire or earthing point at base of RH "A" pillar, if no positive on Grey when switch activated then it's probably an internal fault in the switch?
If all OK so far,
Check pin 1 (Violet wire) on washer motor has 0v
Check pin 2 (Grey wire) on washer motor has 12v when switch is activated.
If you have both then it's probably washer motor?
Check plug on washer motor connections haven't got corroded.
This would now get far more complicated if you had rear wash/wipe! I hope you don't?
 
#9 ·
Ha ha! No. Thankfully no rear wipe.

I dont want to sound dumb, but checking for a negative output?

I am just looking for 0v or background mv on grounds and negatives yes?

These bloody multiplex wiring systems are already doing my head in! What on earth was wrong with batttery voltage switches relays and ground?

Apologies for the rant!

Having said that, i just noticed that my cd30 stereo has lost its memory setting for on/off with the ignition if left longer than a few minutes.

I've set it repeatedly and works initially, but if left a while it doesn't come on with ignition,

But just now,it has turned on, once i turned the lights on!

Flippin eck, is the bcm up the duff or just misbehaving because the wiper stalk is crapped out?
 
#10 ·
On the washer side it's all 0 volts or 12 volts, no connections to the BCM.
The BCM controls the wiper speeds.
Most of the controls are sending either a positive 12v or negative 0v down the same wire (at different times of course) to achieve the desired operation, it's not until you get into cruise control that it starts to use resistors and varying voltages!
 
#12 ·
The fuse may well be blown and that's why he now has the problem with the radio memory?
I have the fuses listed on the circuit diagrams, but on the fuse diagram they are not itemised as to there use, so I must assume that the fuse is designated for that use if it appears in that circuit, but then sod's law plays a big part in getting it right when relying on others work :rolleyes: