Lost coms on pcm please help

[M4NIK]

20240421_094046.jpg

Hi van wont start and unable to read dtc with forscan
Issue started when my central locking stoped working , dash lights flickering. Then lost all power to the dash, no lights
Ive since got the dash working buy splicing new mscan wires from the bcm to the ipc
But im still getting no coms to pcm

[p2thed]

Have you checked conndition of battery, then i would test for power and ground at the pcm, see if you have 2.5 ohms onncan wires. Is there any signs of water ingress into the bcmii.

[M4NIK]

thanks for the reply. condition of batteries are good. bcm has no water damage nor does the pcm. tried another ecu kit with same results, pcm, bcm, clocks, ignition switch transponder and key. so must be a wiring fault. tried the common places, loom passing through rear near parking module and towbar wiring under passenger step. im currently looking for wiring diagrams. thanks