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27th June 2020, 17:18 | #1 |
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Wiring diagram - advice please (photos)
I've put on a few posts recently with similar questions. Ignore them all. This is the Final Question to complete my cruise control retrofit. Jamie Welch handsomely configured my ZT with T4 this morning - thanks again. I got a clean bill of wiring health but there is a brake switch conundrum preventing it from working which I need someone's knowledge about. Please refer to the two diagrams in conjunction with the issue.
Context • My KV6 was built without cruise and interlock • The brake switch has all four wires connected • Header C0285 is missing from the car. That mostly makes sense as it deals with cruise and parking sensors, none of which my car has • The green/red (GR) wire from the brake switch pin 3 (C0775-3) is connected to the electronic auto transmission (EAT) pin 43 (C0932-43) in line with its pre-cruise state. It currently functions exactly the same as the wire from C0775-4 which controls the brakes lights i.e. power appears when the brake pedal is depressed. I do not know if it would function this way if the car was OEM-fitted with cruise as there may be two switch types (one is referred to at Rimmers as double pole, and is shown (only once) on a RAVE wiring diagram as double pole). • Whilst T4 confirms the brake lights functioning correctly from C0775-4, it however reports the brakes being permanently on based on C0775-3. This is despite both pins C0775-3 and -4 behaving identically. This alone appears to be preventing cruise from working. • Pin 6 on the cruise control relay (C0895-6) requires to be connected to C0775-3; in the absence of header C0285, I piggybacked off the EAT C0932-43 as above, to C0895-6. The GR wire colours are also consistent. I am however now doubting whether this is correct based on the attached diagrams. Wot I need help with • I do not know if the OEM brake switch is double-pole. It's only shown once in the entire ZT wiring diagrams as being double-pole and is not shown as such on the attached diagrams. Might this be making any difference to how pin 3 behaves - perhaps open when pin 4 is closed and vice versa? • Should I disconnect the EAT C0932-43 from the brake switch C0775-3 now that cruise is fitted? I'm unable to interpret the diagram in that respect. • Finally, the smaller of the two attached diagrams shows C0932-43 being connected twice to the missing C0285 (pin 2 and pin 3). Is it safe to assume that I can disconnect the brake switch C0775-3 from EAT C0932-43 altogether and instead connect it directly to the cruise relay C0895-6? That's what my brain took me before I wrote this down, and it still arrives at the same point. I realise wiring isn't everyone's bag but it's straightforward for others. I've always had a good knowledge but have limitations. Someone more qualified help will be hugely appreciated. Thanks in advance. Dougie.
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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) 137,000 miles Last edited by goltho; 3rd July 2020 at 00:15.. |
28th June 2020, 09:23 | #2 |
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So this is the only reference I can find to the brake switch which shows it as a double pole unit. I'm stlll unable to determine what this means in terms of how it operates. All the evidence suggests I have a single-pole unit.
Pin 1 is from fused power Pin 2 is to earth Pin 3 is to cruise relay Pin 4 is to brake lights ???
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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) 137,000 miles Last edited by goltho; 28th June 2020 at 09:26.. |
28th June 2020, 10:18 | #3 | |||
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Quote:
The internal detail of the brake pedal switch in your diagrams is unofficial as far as I can tell. RAVE doesn't include it so it may or may not be correct. Quote:
Quote:
Simon
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28th June 2020, 11:57 | #4 | |
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Quote:
All the diagrams are from Rave including the exploded brake switch one. C0932-43 is indeed an input from C0775-3, and it works. I agree that disconnecting the EAT on that basis, isn't logical. In any case, I disconnected C0932-43 and tried connecting F0775-3 direct to the cruise relay C0895-6 but it made no difference. So I'm left with with the question of why there are two OEM brake switches available, one double pole and one single pole, and why T4 was reporting cruise control as believing the brakes are on permanently. Dougie.
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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) 137,000 miles |
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28th June 2020, 11:57 | #5 |
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Hi Doug, yes the internal detail of the double pole brake switch is shown on the exterior brake and reverse lamps part of my wiring diagrams too
I've checked the supercession lists on my EPC, and the original white double pole brake switch has now been replaced with XKB000022A, so a cheaper Land Rover alternative is XKB000022 So I would start by making sure the switch fitted to your car is the correct one, then take it from there Brian |
28th June 2020, 12:06 | #6 | ||
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Quote:
Do you read the switch as needing to be double-pole? Quote:
https://the75andztclub.co.uk/forum/s...3&postcount=14 Dougie.
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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) 137,000 miles Last edited by goltho; 28th June 2020 at 23:31.. |
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28th June 2020, 12:32 | #7 | |
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Quote:
The original part number prior to supercession is as follows XKD000010 Description Switch-stop/cruise brake - White, double pole C And the following applies to the supercession XKB000022 switch Product Description Up to VIN 5D345691 the brake light switch may have been coloured white for cars with cruise control fitted but this black switch is now suitable for those applications. Brian |
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28th June 2020, 13:27 | #8 | |
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Quote:
I may need another T4 session.
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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) 137,000 miles |
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28th June 2020, 13:57 | #9 | |
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Quote:
The alternative is to buy a used switch from a breaker, originating from a KV6 auto fitted with cruise Brian |
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28th June 2020, 14:40 | #10 | |
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Quote:
Dougie.
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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) 137,000 miles |
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