Chinese Lexia-3 for Citroen C4 diagnostics
Moderator: RichardW
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kenhall1202
- Posts: 116
- Joined: 15 Oct 2005, 16:44
- Location: Cumbria, CA21
- My Cars: '05 C4 2.0HDI Exclusive
'07 Lexus RX400h
Past:
'73 GS 1220 Club Estate (a good intro to hydraulics and rust)
'74 DS D Super 5 (Superb comfort and even more rust)
'?? Dyane (fun + rust)
'?? CX 2400 GTI (served me well)
'89 CX Safari 2.5 DTR turbo (aka "the hearse" an excellent family load lugger)
'97 XM 2.1TD (Reliable and economical) - x 2
I bought one of these Launch cables with my Chinese Lexia-3. As far as I can tell all it consists of is a fully populated 16 pin OBD2 male to female lead about 20cm long, marked 'LAUNCH PEUGEOT/CITROEN-16 Converter'.
I believe it's main use is to cover all variations in PSA OBD socket pin allocation when used with the Launch X431 diagnostic kit, rather than using several vehicle specific connectors.
Using it with the Lexia-3 kit made no difference to the results I obtained on my C4.
Here is a bit of useless? information - I checked my Lexia diagnostic cable for electrical continuity and found the following:
9 of the 16 OBD plug pins connect to 10 of the 20 pins present in the 30 pin plug (10 empty) and the other half of the 30 pin plug in turn connects to 18 of the 22 pins on the multiplexer input. Was this designed by a committee??!! or does the 30 pin plug have some additional use I'm not aware of?
EDIT I re-checked the Launch cable pin connections and it is not as simple as I said. Pin 8 from the diagnostic plug is transposed to pin 11 of the socket, all the remaining pins are like for like except for pin 11 in the plug and pin 8 in the socket which are not connected.
I believe it's main use is to cover all variations in PSA OBD socket pin allocation when used with the Launch X431 diagnostic kit, rather than using several vehicle specific connectors.
Using it with the Lexia-3 kit made no difference to the results I obtained on my C4.
Here is a bit of useless? information - I checked my Lexia diagnostic cable for electrical continuity and found the following:
9 of the 16 OBD plug pins connect to 10 of the 20 pins present in the 30 pin plug (10 empty) and the other half of the 30 pin plug in turn connects to 18 of the 22 pins on the multiplexer input. Was this designed by a committee??!! or does the 30 pin plug have some additional use I'm not aware of?
EDIT I re-checked the Launch cable pin connections and it is not as simple as I said. Pin 8 from the diagnostic plug is transposed to pin 11 of the socket, all the remaining pins are like for like except for pin 11 in the plug and pin 8 in the socket which are not connected.
Ken Hall
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cachaciero
- Posts: 1407
- Joined: 13 Apr 2009, 07:24
- Location: West Sussex U.K
- My Cars:
- x 9
Ken
I do strongly suspect that the adaptor cable that you are using for the C4 is not correct, I cannot see how an adaptor cable that checks out a C4 C5-3 correctly could ever check out a C5-1 /2 or Xantia, correctly there are very big differences on the diag connector.
The following will explain more about this.
C5-1/2 16-WAY CENTRAL DIAGNOSTIC SOCKET (C001)
Allocation of the 16 connector pins
Pin N° ALLOCATION
1 + ignition on
2 -
3 -
4 battery earth
5 body earth
6 -
7 Engine management (line K)
8 Fan unit test
9 -
10 -
11 BSI diagnostic.
12 ABS.
13 Pyrotechnic seat belts + airbags.
14 -
15 Engine management (line L)
16 + battery
C4 C5-3 CENTRAL Diagnostic socket
Pin Title
1 +IGN
2 Not connected
3 Diag on CAN (High)
4 Earth
5 Earth
6 SWITCHED CAN (high)
7 K lines: engine management and automatic gearbox ECUs
8 Diag on CAN (Low)
9 Not connected
10 Not connected
11 Not connected
12 K lines: CAN ECUs (ABS or ESP, BHI)
13 Not connected
14 SWITCHED CAN (low)
15 Not connected
16 + Battery
Hope that this helps it at least shows what needs to be connected on the diagnostic plug unfortunately I don't have details of the pin out on the diagnostic adaptor plug that's the big round one.
Cachaciero
I do strongly suspect that the adaptor cable that you are using for the C4 is not correct, I cannot see how an adaptor cable that checks out a C4 C5-3 correctly could ever check out a C5-1 /2 or Xantia, correctly there are very big differences on the diag connector.
The following will explain more about this.
C5-1/2 16-WAY CENTRAL DIAGNOSTIC SOCKET (C001)
Allocation of the 16 connector pins
Pin N° ALLOCATION
1 + ignition on
2 -
3 -
4 battery earth
5 body earth
6 -
7 Engine management (line K)
8 Fan unit test
9 -
10 -
11 BSI diagnostic.
12 ABS.
13 Pyrotechnic seat belts + airbags.
14 -
15 Engine management (line L)
16 + battery
C4 C5-3 CENTRAL Diagnostic socket
Pin Title
1 +IGN
2 Not connected
3 Diag on CAN (High)
4 Earth
5 Earth
6 SWITCHED CAN (high)
7 K lines: engine management and automatic gearbox ECUs
8 Diag on CAN (Low)
9 Not connected
10 Not connected
11 Not connected
12 K lines: CAN ECUs (ABS or ESP, BHI)
13 Not connected
14 SWITCHED CAN (low)
15 Not connected
16 + Battery
Hope that this helps it at least shows what needs to be connected on the diagnostic plug unfortunately I don't have details of the pin out on the diagnostic adaptor plug that's the big round one.
Cachaciero
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MikeT
- Posts: 4809
- Joined: 11 Jun 2007, 16:17
- Location: Christchurch, Dorset. UK
- My Cars: 2005 C5restyle 1.6HDI 16v 110hp VTR Estate
2008 C5 X7 1.6HDI VTR+ Saloon - x 231
Sorry wheeler, got cross-purposes here. I didn't expect the Diag2000 or compatible Lexia software to communicate with the can-bus, I'm just trying to find a cheap set of main leads as my kit didn't come with them. Finding them cheaply is proving nigh on impossible.wheeler wrote: Mike T: The kit in the link is no good for making a Lexia2/diag2000 talk to full CAN cars but i think its not too bad a price for what it is (i dont have any connection with the seller bt the way) What have you been quoted from Actia for the full CAN interface ?