Hello everyone 👋

Is it possible to test a facelift cluster on bench? If yes, does anyone have a wiring diagram and is a BCM additional required?

Regards

Found a Pinout and it works for PWR ON, but no Diag direct to Cluster possible with VCDS. ☹️

Cluster Pinout

32-pin connector -T32a- :

1	-	Fuel gauge sender -G-
2	-	Fuel gauge sender -G-
3	-	not assigned
4	-	not assigned
5	-	not assigned
6	-	not assigned
7	-	Immobilizer reading coil -D2-
8	-	Immobilizer reading coil -D2-
9	-	Speed signal - Ouput
10	-	Speedometer sender -G22-
11	-	Oil level and oil temperature sender -G266-
12	-	not assigned
13	-	Rear fog light warning light -K13-
14	-	Main beam warning light -K1-
15	-	not assigned
16	-	Terminal 31 - Input
17	-	Windscreen washer fluid level sender -G33-
18	-	Coolant shortage indicator sender -G32-
19	-	Ambient temperature sensor -G17-
20	-	Terminal 31 (sender mass) - Output
21	-	Multi-function display -J119-
	-	Function selection switch -E91-
22	-	Multi-function display -J119-
	-	Function selection switch -E91-
23	-	Multi-function display -J119-
	-	Reset button -E92-
24	-	not assigned
25	-	Handbrake warning switch -F9-
26	-	Brake fluid level warning contact -F34-
27	-	Oil pressure switch -F1-
28	-	Drive train CAN bus, high
29	-	Drive train CAN bus, low
30	-	Fog light warning light -K17-
31	-	Terminal 15 - Input
32	-	Terminal 30 - Input

Edited 26 November, 202526 Nov by Lord_Moppy

You'll ideally need a gateway for diagnostics. That's what I would choose and what I do myself. If you want to connect directly, you'll need a 120-ohm resistor.

@Cairus
Thx for reply.

Do you have more informations about this resistor "hack"? I'd like to try it, just for fun. 😅

Yesterday I connected a BCM and was able to query its memory. Today I'll also integrate the cluster and try it out.

My test platform is working. 🙂

Wiring Diagram

This wiring diagram works for me, but I'm not sure if it's correct! 

Cluster Pins to	BCM
28 - Drive train CAN high – T32a	19 - Drive train CAN high - T73b
29 - Drive train CAN low – T32a	18 - Drive train CAN low - T73b

 

 

OBD2 Pins to	BCM
6 - CAN high	23 - Drive train CAN bus high (switched) - T73b
7 - CAN low	22 - Drive train CAN bus low (switched) - T73b
14 - K-Line	37 - Diagnosis wire K - T73b

  

Power
T15 (+12V - Ignition)	Cluster Pin 31
	BCM T73a Pin 44
T30 (+12V)	Cluster Pin 32
	BCM T73b Pin 39
	OBD Pin 16
T31 (Ground)	Cluster Pin 16
	BCM T73b Pin 38
	OBD Pin 4/5

 

Edited 28 November, 202528 Nov by Lord_Moppy