Update on wiper issue, may need help of a t4 expert.

Mdean22 · 25th February 2015, 16:02

My wipers won't turn off, I've pulled both wiper relays and replaced them, they still stay on, the only way to stop them is by disconnecting the wire to the motor, I've removed the wiper stalk and they still won't stop. It's driving me mad, the car is due its mot.

Somebody please help

klarzy · 25th February 2015, 16:07

Quote:

Originally Posted by Mdean22

My wipers won't turn off, I've pulled both wiper relays and replaced them, they still stay on, the only way to stop them is by disconnecting the wire to the motor, I've removed the wiper stalk and they still won't stop. It's driving me mad, the car is due its mot.

Somebody please help

must be getting 12 from a short somewhere after the relay...
Check the loom from the fusebox to the wiper motor, also check the fusebox itself for issues...

SD1too · 25th February 2015, 17:23

Michael,

Have a look at the wiring loom in the vicinity of the NSF inner wheelarch, under the fusebox if that makes sense (just passing on what I've read on the forum). You might find broken wires there covered in mud and rainwater.

Simon

Mdean22 · 25th February 2015, 17:47

Just to clear it up, the wipers stay on if I remove the stalk, they turn off if I disconnect either relay, does this mean there is a short before the relay or after? Surely if it had shorted out the wipers wouldn't work at all not stay on? Same with a fuse this would stop them from working? Will check again tomrrow but is really driving me insane.

SD1too · 25th February 2015, 18:13

Quote:

Originally Posted by Mdean22

.. the wipers stay on if I remove the stalk, they turn off if I disconnect either relay, does this mean there is a short before the relay or after? Surely if it had shorted out the wipers wouldn't work at all not stay on?

Michael,

It's not easy to draw conclusions like this. One relay deals with the 'run' and 'park' modes, and the other 'slow' and 'fast' speeds. Both have control connections to the BCU which provides an earth for the relay coils. The stalk control also connects with the BCU, so disconnecting these components doesn't really help.

Simon

HarryM1BYT · 25th February 2015, 18:33

My take on this, is that the wipers can be controlled by either the BCU or directly by the stalk switch.

Either source could be forcing the wiper relays on and the wipers to run.

He suggests he has unplugged the wiper stalk, so that only leaves the BCU generating the 'run' signal, or a fault on the wiring.

He might try unplugging the BCU, after disconnecting the battery, then reconnecting the battery to see what the result is.

Mdean22 · 25th February 2015, 19:05

Quote:

Originally Posted by HarryM1BYT

My take on this, is that the wipers can be controlled by either the BCU or directly by the stalk switch.

Either source could be forcing the wiper relays on and the wipers to run.

He suggests he has unplugged the wiper stalk, so that only leaves the BCU generating the 'run' signal, or a fault on the wiring.

He might try unplugging the BCU, after disconnecting the battery, then reconnecting the battery to see what the result is.

I'm going to fit a switch to the love wore to the wiper motor so I can at least get the car moted

marinabrian · 26th February 2015, 06:14

Quote:

Originally Posted by Mdean22

I'm going to fit a switch to the love wore to the wiper motor so I can at least get the car moted

Mmm Love wore, that sounds nice

Brian

BigRuss · 26th February 2015, 18:49

Chances are it'll be the wiring beneath the engine bay fuse box, had a few of these now

Russ

SD1too · 26th February 2015, 18:59

Quote:

Originally Posted by BigRuss

Chances are it'll be the wiring beneath the engine bay fuse box ..

Thanks Russ for endorsing my suggestion at post no. 3. It seems to have fallen on deaf ears though ....

Simon

25th February 2015, 16:02	#1
Mdean22 Loves to post Mg zt-t mg zr audi a6 defender Join Date: Apr 2014 Location: Halifax Posts: 300 Thanks: 32 Thanked 20 Times in 17 Posts	Update on wiper issue, may need help of a t4 expert. My wipers won't turn off, I've pulled both wiper relays and replaced them, they still stay on, the only way to stop them is by disconnecting the wire to the motor, I've removed the wiper stalk and they still won't stop. It's driving me mad, the car is due its mot. Somebody please help

25th February 2015, 17:23	#3
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,367 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Michael, Have a look at the wiring loom in the vicinity of the NSF inner wheelarch, under the fusebox if that makes sense (just passing on what I've read on the forum). You might find broken wires there covered in mud and rainwater. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

25th February 2015, 18:33	#6
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	My take on this, is that the wipers can be controlled by either the BCU or directly by the stalk switch. Either source could be forcing the wiper relays on and the wipers to run. He suggests he has unplugged the wiper stalk, so that only leaves the BCU generating the 'run' signal, or a fault on the wiring. He might try unplugging the BCU, after disconnecting the battery, then reconnecting the battery to see what the result is. __________________ Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money.

26th February 2015, 18:49	#9
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,405 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	Chances are it'll be the wiring beneath the engine bay fuse box, had a few of these now Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.

25th February 2015, 17:47	#4
Mdean22 Loves to post Mg zt-t mg zr audi a6 defender Join Date: Apr 2014 Location: Halifax Posts: 300 Thanks: 32 Thanked 20 Times in 17 Posts	Just to clear it up, the wipers stay on if I remove the stalk, they turn off if I disconnect either relay, does this mean there is a short before the relay or after? Surely if it had shorted out the wipers wouldn't work at all not stay on? Same with a fuse this would stop them from working? Will check again tomrrow but is really driving me insane.