No start after replace wire harness and fuse box (under hood)

Frank Service Manager Nevada Posted   Latest   Edited  
Unsolved
Driveability
2010 Mercury Mariner 3.0L (G 99G) 6-spd (6F35) — 4M2CN8BG1AKJ29825
No Start
No Communication
No Crank / No Start

original diagnosis revealed the front fuse box was preventing proper connection for the AC electric (condenser) fan - replace with a new factory unit that included part of the wiring harness - we verified all grounds and power supply to the PCM

no communication with PCM, ABS, AIRBAG, OCSM, INST CLUSTER, GEM, STEERING (all high can) We have tried to unplug the modules without communication. 

see attached video of the high can - KOEO and Key off. 

The Key OFF is the left video 

Key ON is the Right VIdeo

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Jason Owner/Technician
Virginia
Jason Default
 

Kind of seems like your missing the acc/run supply. I'd check for missing relay/fuse and the wiring from the BJB.

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Frank Service Manager
Nevada
Frank Default
 

Thank you - we will double check

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Dmitriy Analyst
Ontario
Dmitriy Default
 

As the file uploader sometimes changes file order, could you clarify whether the KOEO video is on the left or right?

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Frank Service Manager
Nevada
Frank Default
 

Key OFF is the left video Key ON is the Right VIdeo

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Dmitriy Analyst
Ontario
Dmitriy Default
 

This looks like CAN + and - are switched for some modules or a network branch: diag​.​net/file/f3s8we5nj… ​ Some modules talk as intended, some talk in the inverse way. Wiring diagram with the section of the harness that got replaced marked could be helpful…

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Helpful
Frank Service Manager
Nevada
Frank Default
 

We will get that, thanks.

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Scott Owner
California
Scott Default
 

Hi Frank, Just stating the obvious here - the only issue was the cooling fan was inop and a factory fuse block was installed. Now there's a communication fault and the vehicle doesn't start/no crank. All those modules, at least for GM would not be just High Speed GMLAN, but also on the Low Speed GMLAN for a few of them. Have you verified that was the correct part? Have you verified all fuses…

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Frank Service Manager
Nevada
Frank Default
 

Thanks, we did verify part number - we were told update number and the right one - tested resistance on high to low can for a short, none fount - verified all the can wires are in the correct position on the connectors - I will check the Low-speed GMLAN

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Donald Mechanic
Michigan
Donald Default
 

Check the connectors on the new harness for pushed out pins.

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Frank Service Manager
Nevada
Frank Default
 

All connector pins have been verified, all the cal lin positions have been verified - All Power and grounds have been verified.

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Frank Service Manager
Nevada
Frank Default
 

We are still working on this - every connector and pin has been verified - we are starting a warranty claim on the new harness - The power supply relay for the PCM gets warm - voltage drops and resistance is ok -

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Frank Service Manager
Nevada
Frank Default
 

OK, we took the old harness and plugged in enough to see if the can problem was fixed, it was - i can not explain how or why, looks like a bad harness (ALL connectors were chacked) - new on on the way and should be here end of week - I will repost after verified repaired

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