Where is the ‘K-Bus’?

PMAN01 · 19th July 2021, 11:04

I keep seeing this being mentioned re: electrical issues but where exactly is the k-bus?

Arctic · 19th July 2021, 11:40

Quote:

Originally Posted by exforces

I keep seeing this being mentioned re: electrical issues but where exactly is the k-bus?

Hi Richard
This link will give you an insight about K-Bus

https://cse.google.com/cse?cx=013872....0.ekzqLuYso9o

https://www.bmwgm5.com/K-Bus_Troubleshooting.htm

PMAN01 · 19th July 2021, 13:34

Ahh. Ta muchly arctic. It’s basically a block of wires where they meet then really. Silly question but do you know where it is on a diesel 75? I get the impression you do know!

another_clean_sheet · 19th July 2021, 14:11

Quote:

Originally Posted by exforces

Ahh. Ta muchly arctic. It’s basically a block of wires where they meet then really. Silly question but do you know where it is on a diesel 75? I get the impression you do know!

In simplistic terms it is a communication system that connects various electronic modules together. It is not something that you can remove from the car and say "this is the K Bus"

PMAN01 · 19th July 2021, 14:13

Right you are. When you mentioned k-bus after getting the er message in the climate control display, I was wondering where the k-bus was!

SD1too · 19th July 2021, 17:05

Quote:

Originally Posted by exforces

It’s basically a block of wires where they meet then really. Silly question but do you know where it is on a diesel 75?

Up behind the light switch module I believe.

For fault finding see MGMarc's post no. 15 in the thread "K Bus issues".

Simon

petem · 19th July 2021, 17:11

Quote:

Originally Posted by Arctic

Hi Richard
This link will give you an insight about K-Bus

https://cse.google.com/cse?cx=013872....0.ekzqLuYso9o

https://www.bmwgm5.com/K-Bus_Troubleshooting.htm

Thanks for the link to the BMW article. Very helpful right now.

hogweed · 20th July 2021, 10:56

Quote:

Originally Posted by exforces

I get the impression you do know!

Arctic knows EVERYTHING

A bus is a computer concept - it's a system rather than a wire or something. So the USB on your computer is a Universal Serial Bus, consisting of wires, plugs, sockets, and software/protocols which define what happens on it.

But essentially it's a communication system, designed for transferring information from one place to another in a structured way

T-Cut · 21st July 2021, 19:50

Actually identifying K-Bus wires can be difficult due to the unusual color coding. Basically every K-bus wire has red and white stripes with a yellow dash every three inches or so. The yellow dash isn't easy to spot and seems to have been applied with a small paint brush. It's basically a splodge and doesn't form a yellow band around the wire as you might logically expect. Even the experts can get this one wrong, so always double check for the yellow splodges.

TC

BigRuss · 22nd July 2021, 22:41

Doesn't help that some k-bus wires are just red/white with no yellow spots especially those that go to the k-bus headers

Russ

19th July 2021, 11:04	#1
PMAN01 Happy to waft not race thanks! Join Date: Feb 2010 Posts: 191 Thanks: 196 Thanked 21 Times in 14 Posts	Where is the ‘K-Bus’? I keep seeing this being mentioned re: electrical issues but where exactly is the k-bus?

22nd July 2021, 22:41	#10
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	Doesn't help that some k-bus wires are just red/white with no yellow spots especially those that go to the k-bus headers 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.

19th July 2021, 13:34	#3
PMAN01 Happy to waft not race thanks! Join Date: Feb 2010 Posts: 191 Thanks: 196 Thanked 21 Times in 14 Posts	Ahh. Ta muchly arctic. It’s basically a block of wires where they meet then really. Silly question but do you know where it is on a diesel 75? I get the impression you do know!

19th July 2021, 14:13	#5
PMAN01 Happy to waft not race thanks! Join Date: Feb 2010 Posts: 191 Thanks: 196 Thanked 21 Times in 14 Posts	Right you are. When you mentioned k-bus after getting the er message in the climate control display, I was wondering where the k-bus was!

21st July 2021, 19:50	#9
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Actually identifying K-Bus wires can be difficult due to the unusual color coding. Basically every K-bus wire has red and white stripes with a yellow dash every three inches or so. The yellow dash isn't easy to spot and seems to have been applied with a small paint brush. It's basically a splodge and doesn't form a yellow band around the wire as you might logically expect. Even the experts can get this one wrong, so always double check for the yellow splodges. TC