Let me preface this by saying I have searched the search bar and tried several solutions with no results yet**
I have a 2007.5 lmm i bought to use motor in something else,
When you turn key on engine light is slow to show up. It won't crank. Service board shows service 4x4, and some others, abs light is on
Gauges dont show anything at all, even when I crank motor on starter
Important codes are ecm doesnt communicate with bcm, tcm doesnt communication with bcm, ebcm doesnt communicate with ecm, ecu or bcm.
Motor will fire right up with key on and jumping starter
So I have read through the threads and here is what I have done so far.
New ignition switch
Cleaned grounds on driver side frame
New batteries
Cleaned main fuses wires the two 175s and 125. And replaced fuses.
I tried grounding ecm like I found in another thread** didnt do anything
Had a radio fault from vcim so I unplugged radio.
Checked all fuses for continuity
Checked gmlan it was at 60 ohms.
I have started tearing into the wiring loom but no broken wires yet just trying to figure out if its a bad bcm or not since ill be doing away with it at swap
Appreciate yalls thoughts
I have a 2007.5 lmm i bought to use motor in something else,
When you turn key on engine light is slow to show up. It won't crank. Service board shows service 4x4, and some others, abs light is on
Gauges dont show anything at all, even when I crank motor on starter
Important codes are ecm doesnt communicate with bcm, tcm doesnt communication with bcm, ebcm doesnt communicate with ecm, ecu or bcm.
Motor will fire right up with key on and jumping starter
So I have read through the threads and here is what I have done so far.
New ignition switch
Cleaned grounds on driver side frame
New batteries
Cleaned main fuses wires the two 175s and 125. And replaced fuses.
I tried grounding ecm like I found in another thread** didnt do anything
Had a radio fault from vcim so I unplugged radio.
Checked all fuses for continuity
Checked gmlan it was at 60 ohms.
I have started tearing into the wiring loom but no broken wires yet just trying to figure out if its a bad bcm or not since ill be doing away with it at swap
Appreciate yalls thoughts
