Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 28th June 2020, 16:19   #21
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,270
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by marinabrian View Post
Dougie is referring to header 0285 ...
Thanks because that header is labelled C0288 on my RAVE (2003 version).
It appears that our diagrams have major differences which is odd.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.

Last edited by SD1too; 28th June 2020 at 16:24..
SD1too is offline   Reply With Quote
Old 28th June 2020, 16:29   #22
marinabrian
 
marinabrian's Avatar
 
MG ZT

Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
Default

Quote:
Originally Posted by SD1too View Post
Thanks because that header is labelled C0288 on my RAVE (2003 version).
It appears that our diagrams have major differences which is odd.

Simon
So you must be looking at RCL 0417 ENG then Simon?

It's the same joint though, although labelled differently is somewhat confusing I agree.

I'm off to walk the dog, I'll leave it with you and Dougie

Brian
marinabrian is offline   Reply With Quote
Old 28th June 2020, 16:33   #23
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,270
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by marinabrian View Post
So you must be looking at RCL 0417 ENG then Simon?
I'm looking at RCL 0544 ENG.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 28th June 2020, 16:36   #24
goltho
Can't help myself
 
goltho's Avatar
 
Rover 75

Join Date: Jan 2018
Location: Lincoln
Posts: 865
Thanks: 469
Thanked 150 Times in 113 Posts
Default

Quote:
Originally Posted by SD1too View Post
According to your wiring diagrams this appears to be incorrect. Your diagram shows the brake pedal switch making pins 1 & 3 (sending +12v to two ECUs) but pins 2 & 4 sends an earth to the LSM, ABS ECU, cruise "relay" and cruise ECU, i.e. not exactly the same function.

This suggests that there may be a problem with your brake pedal switch.

I can't find C0285. Do you mean C0288?

Simon
Simon, you're quite correct about the earth on pins 2 & 4 - I incorrectly referred to them as sending +12v. However, the brake lamps operate correctly; it's possible that one or both of my additional connections to the cruise relay and/or ECU is bad though which would mean an incomplete earth, and I'll check that.

Pin 1 as you'll see brings +12v to the second pole (pin 3) which is then sent via pin 3 to the EAT and cruise relay when the brake pedal is pressed. That is functioning correctly.

Regarding C0285, it's shown on pages 34 & 36 of Rave, and also on the Header Joints page 109. If you check out the C0285 Connector Detail in the library, it confirms pins 1-4 as being grouped and GR in colour. However my car does not have a C0285 header as it doesn't have interlock*, cruise or parking sensors. *incorrect, it does but without requiring brake input

The fact that half of the switch completes an earth and the other half completes a +12v connection, must mean that it is in fact a double pole switch. Yes?

Dougie.
__________________
R75 C2 RJBLH Connoisseur CDTi Auto Saloon
• Built 08/02/2005 @14:57 hrs: Registered 26/08/2005
• 122nd of 141 built that day
• British Racing Green Pearlescent (HFF)
• Sandstone leather with black piping (SPJ)
• 136,000 miles

Last edited by goltho; 3rd July 2020 at 00:22..
goltho is offline   Reply With Quote
Old 28th June 2020, 16:42   #25
goltho
Can't help myself
 
goltho's Avatar
 
Rover 75

Join Date: Jan 2018
Location: Lincoln
Posts: 865
Thanks: 469
Thanked 150 Times in 113 Posts
Default

Quote:
Originally Posted by marinabrian View Post
I'm fairly confident Dougie has the incorrect switch fitted to his car, it has been seen on a few occasions now where people have retrofitted cruise.
I'l be more than happy if it is wrong Brian, but we've established that one pole is correctly operating an earth circuit and the other pole is correctly operating a +12v one. That's confirms double pole.

Dougie.
__________________
R75 C2 RJBLH Connoisseur CDTi Auto Saloon
• Built 08/02/2005 @14:57 hrs: Registered 26/08/2005
• 122nd of 141 built that day
• British Racing Green Pearlescent (HFF)
• Sandstone leather with black piping (SPJ)
• 136,000 miles
goltho is offline   Reply With Quote
Old 28th June 2020, 16:45   #26
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,270
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by goltho View Post
The fact that half of the switch completes an earth and the other half completes a +12v connection, must mean that it is in fact a double pole switch. Yes?
Yes, but remember that as it's a Hall effect device there are no moving parts.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.

Last edited by SD1too; 28th June 2020 at 16:48..
SD1too is offline   Reply With Quote
Old 28th June 2020, 17:06   #27
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,270
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by goltho View Post
• My KV6 was built without ... interlock
• Header C0285 is missing from the car. That mostly makes sense as it deals with interlock ..
This also puzzles me Dougie. Your signature says that your car is a 180 sports auto so surely it must have the interlock unit.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 28th June 2020, 17:14   #28
goltho
Can't help myself
 
goltho's Avatar
 
Rover 75

Join Date: Jan 2018
Location: Lincoln
Posts: 865
Thanks: 469
Thanked 150 Times in 113 Posts
Default

Quote:
Originally Posted by SD1too View Post
Yes, but remember that as it's a Hall effect device there are no moving parts.

Simon
Yes, true. I went out & checked pin 9 on C0286 which is the GP wire from the switch pin 4 (C0075-4). My reasoning for connecting to that header was that the switch pin 4 wire was/is inaccessible without some more surgery, and I made the assumption that it connects directly from C0775-4 to C0286-9 (9-11 are common). Pin 9 (and 10 and 11) on that header however tests as permanently earthed which will be one good reason why cruise thinks the brake pedal is pressed. The brake lamps work correctly so it's clear that my assumption was wrong, despite the diagram saying it was right.
__________________
R75 C2 RJBLH Connoisseur CDTi Auto Saloon
• Built 08/02/2005 @14:57 hrs: Registered 26/08/2005
• 122nd of 141 built that day
• British Racing Green Pearlescent (HFF)
• Sandstone leather with black piping (SPJ)
• 136,000 miles

Last edited by goltho; 28th June 2020 at 17:23..
goltho is offline   Reply With Quote
Old 28th June 2020, 17:53   #29
goltho
Can't help myself
 
goltho's Avatar
 
Rover 75

Join Date: Jan 2018
Location: Lincoln
Posts: 865
Thanks: 469
Thanked 150 Times in 113 Posts
Default

Thanks guys for your input this afternoon - it's much appreciated. I'm in a much clearer place despite not yet having cracked the job, as a result. It's clear that I'm going to have to change the switch which I'm collecting from Rimmers in the morning, although I still don't understand why the connections from (allegedly) pin 4 test as permanently earthed despite the brake lamps working correctly. Perhaps my version of Rave isn't correct relative to my car. Or more likely I'm missing something. Either way, here's to tomorrow.

Dougie.
__________________
R75 C2 RJBLH Connoisseur CDTi Auto Saloon
• Built 08/02/2005 @14:57 hrs: Registered 26/08/2005
• 122nd of 141 built that day
• British Racing Green Pearlescent (HFF)
• Sandstone leather with black piping (SPJ)
• 136,000 miles

Last edited by goltho; 28th June 2020 at 17:58..
goltho is offline   Reply With Quote
Old 28th June 2020, 21:59   #30
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,270
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by goltho View Post
Pin 9 (and 10 and 11) on that header however tests as permanently earthed ...
How did you test it Dougie?
Quote:
Originally Posted by goltho View Post
The brake lamps work correctly ..

They're triggered, via the LSM, from the same C0286 header which you say is permanently earthed. How can that be?

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 11:01.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd