Hello to all forum members.

I'm trying to adapt a used IPC, but I can't get the bench communication with the DPS to work.

I'm connecting the cluster as follows:

Pin 3: GMLan SPD - To OBD PIN 1

Pin 7: + Battery

Pin 6: + Ignition

Pin 19: Ground

DPS connection type: GMLan, Diagnostic PIN: 1

ECU Address: 60

What could be happening, or what am I doing wrong?

I would appreciate your help.

Thank you.

1) Ignition is on PIN:8.
2) are you 100% sure Alldata have correct wiring diagram for this cluster? I would double check with GM TIS, just to be sure.
3) Check what that LIN bus is used for.. maybe it is used as "enable communication" signal input from BCM. In this case - you will need to have a BCM too in your bench setup.

Thanks Pupu14

Yes, I connected the ignition to 8, it was a mistake when writing

I don't have BCM for testing

I connected a BCM to the same network as the IPC. I can connect to BCMs (6 and 14) but not to the Cluster.

No one has any ideas.

I have already solved the problem, a 120 ohm resistance between pin 1 and pin 4 of the OBD connector or pin 3 and 19 of the IPC.