?

Ponderosa · 18th November 2023, 13:13

I have a 75 Connoiseur Tourer Diesel Automatic bought 2001 by me .The very fast wiper will not work the motor is OK as other speeds work.A new relay was fitted but I am told that "underneath" there is something that tells the relay to work.I am told that I would have to find one of these units(?) and would then have to have it programmed ! There nothing in the Haynes Workshop manual- has anyone any suggestions.

SD1too · 18th November 2023, 14:15

Hello Kenneth,

The unit you describe is the body control unit (BCU) but I doubt that's the cause.

You mention fitting a new relay. There are two. One switches between run and park, the other between slow and fast speeds. But relays are very reliable.

I would look at the column stalk which, for fast speed, earths the light green/blue wire. You could test the switch with a multimeter. That would be the best place to start.

Simon

Mike Noc · 19th November 2023, 15:17

I currently have this same fault on my car. The slow/fast relay isn't switching due to it not receiving a signal to do so. The wiper stalk on my car is fine and the BCU is recieving the input from it, so either the BCU is faulty or the wiring between the BCU and the relay has a fault. When I get a spare moment I'll check the wiring for continuity, and I suggest the OP gets someone to do the same on his car

18th November 2023, 13:13	#1
Ponderosa Newbie Rover 75 Diesel Tourer Join Date: Jul 2016 Location: Leighton Buzzard Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	? I have a 75 Connoiseur Tourer Diesel Automatic bought 2001 by me .The very fast wiper will not work the motor is OK as other speeds work.A new relay was fitted but I am told that "underneath" there is something that tells the relay to work.I am told that I would have to find one of these units(?) and would then have to have it programmed ! There nothing in the Haynes Workshop manual- has anyone any suggestions.

18th November 2023, 14:15	#2
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: 19,980 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Hello Kenneth, The unit you describe is the body control unit (BCU) but I doubt that's the cause. You mention fitting a new relay. There are two. One switches between run and park, the other between slow and fast speeds. But relays are very reliable. I would look at the column stalk which, for fast speed, earths the light green/blue wire. You could test the switch with a multimeter. That would be the best place to start. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

19th November 2023, 15:17	#3
Mike Noc Relax, it's a Rover. Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,462 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	I currently have this same fault on my car. The slow/fast relay isn't switching due to it not receiving a signal to do so. The wiper stalk on my car is fine and the BCU is recieving the input from it, so either the BCU is faulty or the wiring between the BCU and the relay has a fault. When I get a spare moment I'll check the wiring for continuity, and I suggest the OP gets someone to do the same on his car