diagnostic connector

david2000 · 18th October 2011, 17:58

i have a fault with my diagnostic connector, after looking at the rover workshop manuel for the wireing diagrame i found out that my connector is wired up totaly diffrent compared to the wireing diagramme,on my rover 75 connie se diesel the pins are as follows

pin 1 grey wire
pin 2 white pink wire
pin 3 earth
pin 4 earth
pin 9 purple wire

can anyone tell me what each wire does,which one is the k line,ds2 line,k bus,earth to chassy,earth signal and does anyone have a correct wireing diagrame for my car, i have a suspicion that i have a bmw 320d diesel wireing loom on the car,does any know if this is correct and do you have a wireing diagrame for the bmw 320d diesel and can tell me what the pins do on the bmw
all the best
david

tsautos · 18th October 2011, 18:53

pin 16 purple/slate, live
pin 8 slate, ins pack.
pin 7 pink/white, ecu all comm's.
pin 4 black, earth.
pin 5 black, earth.

T-Cut · 18th October 2011, 20:53

The wiring of OBD sockets is standardised on Pins 2,4,5,6,7,10,14,15 and 16. The rest are used by car manufacturers as they wish.
Your earth pins are not standard, so I'd assume you have mis-numbered them. The earth pins are always 4 and 5 as TS indicates. The BMW socket will follow these standards as well. If you could put up a drawing or photo with your socket/pins numbering it may help.

TC

VMax1000 · 18th October 2011, 21:10

The pinout assignment of unspecified pins is left to the vehicle manufacturer's discretion.

1.-
2.Bus positive Line of SAE-J1850
3.-
4.Chassis ground
5.Signal ground
6.CAN high (ISO 15765-4 and SAE-J2234)
7.K line of ISO 9141-2 and ISO 14230-4
8.-
9.-
10.Bus negative Line of SAE-J1850
11.-
12.-
13.-
14.CAN low (ISO 15765-4 and SAE-J2234)
15.L line of ISO 9141-2 and ISO 14230-4
16.Battery voltage

Pay some attention to the mounting. On my ZT the connector is mounted under the LSM but 180 degrees rotated. Row 1-8 now being the lower one

HarryM1BYT · 18th October 2011, 21:55

I'm a bit out of touch with all this, but from memory of when I found my socket loose in the car(mid 2004 CDTi), it only had three wires on it. My engine diagnostics work fine, but nothing beyond that.

I understand my diagnostics unit can also look at the CanBus. So if I were to bring my 75's CanBus wiring over to the diagnostic socket (as per the above), might it work?

T-Cut · 18th October 2011, 23:06

Quote:

Originally Posted by VMax1000

Pay some attention to the mounting. On my ZT the connector is mounted under the LSM but 180 degrees rotated. Row 1-8 now being the lower one

The correct fitting is indeed 'inverted'. It's not unknown to find it in the 'typical' orientation though.

TC

18th October 2011, 17:58	#1
david2000 Loves to post Rover 75 Tourer Join Date: Dec 2007 Location: Ammanford Posts: 493 Thanks: 248 Thanked 29 Times in 24 Posts	diagnostic connector i have a fault with my diagnostic connector, after looking at the rover workshop manuel for the wireing diagrame i found out that my connector is wired up totaly diffrent compared to the wireing diagramme,on my rover 75 connie se diesel the pins are as follows pin 1 grey wire pin 2 white pink wire pin 3 earth pin 4 earth pin 9 purple wire can anyone tell me what each wire does,which one is the k line,ds2 line,k bus,earth to chassy,earth signal and does anyone have a correct wireing diagrame for my car, i have a suspicion that i have a bmw 320d diesel wireing loom on the car,does any know if this is correct and do you have a wireing diagrame for the bmw 320d diesel and can tell me what the pins do on the bmw all the best david

18th October 2011, 21:10	#4
VMax1000 Passed Away MG ZT260 Join Date: May 2007 Location: Swindon Posts: 2,805 Thanks: 62 Thanked 325 Times in 249 Posts	The pinout assignment of unspecified pins is left to the vehicle manufacturer's discretion. 1.- 2.Bus positive Line of SAE-J1850 3.- 4.Chassis ground 5.Signal ground 6.CAN high (ISO 15765-4 and SAE-J2234) 7.K line of ISO 9141-2 and ISO 14230-4 8.- 9.- 10.Bus negative Line of SAE-J1850 11.- 12.- 13.- 14.CAN low (ISO 15765-4 and SAE-J2234) 15.L line of ISO 9141-2 and ISO 14230-4 16.Battery voltage Pay some attention to the mounting. On my ZT the connector is mounted under the LSM but 180 degrees rotated. Row 1-8 now being the lower one Last edited by VMax1000; 18th October 2011 at 21:12..

18th October 2011, 21:55	#5
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	I'm a bit out of touch with all this, but from memory of when I found my socket loose in the car(mid 2004 CDTi), it only had three wires on it. My engine diagnostics work fine, but nothing beyond that. I understand my diagnostics unit can also look at the CanBus. So if I were to bring my 75's CanBus wiring over to the diagnostic socket (as per the above), might it work? __________________ 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.

18th October 2011, 18:53	#2
tsautos Loves to post MG EXPRESS Join Date: Dec 2010 Location: STOURBRIDGE Posts: 439 Thanks: 0 Thanked 4 Times in 4 Posts	pin 16 purple/slate, live pin 8 slate, ins pack. pin 7 pink/white, ecu all comm's. pin 4 black, earth. pin 5 black, earth.

18th October 2011, 20:53	#3
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	The wiring of OBD sockets is standardised on Pins 2,4,5,6,7,10,14,15 and 16. The rest are used by car manufacturers as they wish. Your earth pins are not standard, so I'd assume you have mis-numbered them. The earth pins are always 4 and 5 as TS indicates. The BMW socket will follow these standards as well. If you could put up a drawing or photo with your socket/pins numbering it may help. TC