I am in the process of rebuilding a wrecked C6. I have never seen the car run so I don't know what normal is during startup. Using the start button the starter will not engage at all. I can get the car to start by connecting the purple wire going to the starter solenoid to the positive terminal on the battery. So that rules out the starter and battery. Is there anything that would prevent the computer from trying to turn the starter over? I also tried switching the starter relay inside the relay box with the defrost relay. The cars abs module is still out and I need to send the airbag controller out to be cleared. Does anybody have a wiring diagram for a base c6?

 

Seems to me a couple of issues still need to be cleared before the ecm will let you start.

A buddy with a tech two will be real handy or a auto body will have it or have somebody they know.

 

ECBM connector has a Lan pass through on it through the ECBM, and with the plug unplugged from the ECBM, mostly likely the root of the problem.
(read car will not start if you pull the VCIM and don't jump out the lan on that connector, and would think the same here.

Pin wc Circuit
B9 TN 2501 High Speed GMLAN Serial Data (-)

B10 TN 2501 High Speed GMLAN Serial Data (-)

B11 TN/BK 2500 High Speed GMLAN Serial Data (+)

B12 TN/BK 2500 High Speed GMLAN Serial Data (+)


I can't post it here, but if you want the EBCM connectors wiring diagram (doc #1451944), then IM me your email address and I can scan and attach the 8 pages that I just printed out on it in a email back to you.

P.S, got to ask, how are you rebuilding the car without the GM service manual to start with?

 

Thanks Dano523. I bought the car totaled but intact. So I labeled every nut/bolt as I disassembled it. I also labeled both ends of every harness I unplugged. With a little luck hopefully it will run again. It took quite a while to take apart. But it made it easy going back together.

 

Dan, just emails them over to you.
But if anyone else needs them, put them in media fire for download.
http://www.mediafire.com/download/77...or+diagram.zip

 

I installed the ecbm today still no luck. I used a scan tool I see error code U0100 sounds like it is a general communication failure. I see it could be the ecm, ebcm or even the tcm. Any tips on narrowing it down?

 

The lan connects to and jumps through a lot of modules,


As for your U codes to figure out which one is unplugged, here you go,
U0001 High Speed CAN Communication Bus ECM
U0101 Lost Communications with Transmission Control Module (TCM) ECM
U0121 Lost Communications with Electronic Brake Control Module (EBCM) ECM
U0140 Lost Communication With Body Control Module (BCM) ECM
U1000 Class 2 Data Link BCM, DDM, DDS, DPM, DRR, FTC, HUD, IPC, PDM, Radio, RCDLR, SCLCM, SDM, VCIM
U1017 Lost Communications with Engine Control Module (ECM) DDM, DDS, DRR, FTC, HVAC, HUD, IPC, PDM, Radio, RCDLR, SDM, VCIM
U1024 Lost Communications with Transmission Control Module (TCM) DDS, DDM, DPM, FTC, IPC, HUD, PDM, Radio, RCDLR
U1040 Lost Communications with Electronic Brake Control Module (EBCM) IPC
U1064 Lost Communications with Body Control Module (BCM) DDM, DDS, DPM, DRR, FTC, HVAC, HUD, IPC, PDM, Radio, RCDLR, SDM, VCIM
U1088 Lost Communication with Sensing and Diagnostic Module (SDM) BCM, IPC
U1096 Lost Communication with Instrument Panel Cluster (IPC) BCM, DDM, HUD, HVAC, PDM, Radio, SDM
U1098 Lost Communications with Head Up Display (HUD) BCM, IPC
U1128 Lost Communications with Radio DRR, IPC, HUD
U1137 Lost Communications with Digital Radio Receiver (DRR) Radio
U1151 Lost Communications with Communication Interface Module (OnStar®) IPC
U1153 Lost Communication with HVAC Control Module BCM, DDM, IPC, HUD, PDM, Radio
U1160 Lost Communications with Driver Door Module (DDM) IPC
U1161 Lost Communications with Passenger Door Module (PDM) IPC
U1164 Lost Communications with Driver Door Switch (DDS) DDM, DPM, DRR, IPC, PDM, Radio, RCDLR
U1166 Lost Communication with Driver Position Module (DPM) IPC
U1177 Lost Communications with Folding Top Controller (FTC) DDM, HVAC, IPC, PDM
U1193 Lost Communications with Remote Control Door Lock Receiver (RCDLR) BCM, DDM, DDS, DPM, DRR, FTC, HVAC, HUD, IPC, PDM, Radio, SDM, VCIM
U1194 Lost Communications with Steering Column Lock Control Module (SCLCM) BCM, IPC
U1255 Class 2 Data Link HVAC
U1300 Class 2 Data Link Low DDM, DDS, DRR, HVAC, IPC, PDM, Radio, SDM, VCIM
U1301 Class 2 Data Link High DDM, DDS, DRR, HVAC, IPC, PDM, Radio, SDM, VCIM
U1305 Class 2 Data Link Low or High BCM, DPM, FTC, HUD, SCLCM
U1500 Inter-device Dedicated Bus 1 VCIM
U2100 Controller Area Network (CAN) Bus Communication ESC, BCM, EBCM, TCM
U2105 Lost Communication with Engine Control Module (ECM) BCM, EBCM, ESC, TCM
U2106 Lost Communication With Transmission Control Module (TCM) BCM, EBCM
U2107 Lost Communication With Body Control Module (BCM) EBCM, ESC, TCM
U2108 Lost Communication With Electronic Brake Control Module (EBCM) BCM, ESC, TCM
U2112 Lost Communications With Electronic Suspension Control Module (ESC) EBCM
U2153 Navigation Electronic Control Unit (ECU) - VICS Communication Circuit Navigation Radio

 

I found the problem. Broken can bus wires near the ABS module. All two tan and two tan/black were broken in the wreck. After those were fixed if fired right up.

 

Wow. I commend you. That had to be tough.

 

Ditto, and may have lucked up with the problem in an area easy to spot.

Hence for the love of god, and still not figure out whey GM installed Two wire loom male/ female mating connectors above the ECM/TCM in a blind spot that you would have to send in a small monkey to find and solve a problem there.


They are are up behind the scm panel above the ECM, and he only way to get up there, is up through the opening just above the ECM with either the fender removed, or the back wheel well panel removed.

 

I definitely got lucky. I started at the ECM working backward with a multimeter testing for continuity and pretty much found it the first test. I have no inner or outer fenders on yet so the wires were easily to get to. The wiring diagrams helped out immensely.