Posted to Technical Discussion Forum on 6/20/2015
13 Replies
Here's a quick Cruze GMLAN repair that may help someone not
used to dealing with GMLAN on a daily basis.
A 2014 Cruze was driven in with a complaint of "Service
Power Steering System" and "Service Traction System"
warnings illuminated along with the ABS, Brakes and Traction
lamps illuminated.
A fast scan with GDS shows this... 2014 Chevrolet Cruze
LS, ECM/Inputs/Outputs Scan Data
Looks like the EBCM doesn't want to talk to anybody. Lets
look at the Diagnostic Data Bus Tool .... 2014 Chevrolet
Cruze LS, ECM/Inputs/Outputs Scan Data
OK - that confirms it - hows the high speed data lines look?
2014 Chevrolet Cruze LS, ECM/Inputs/Outputs Scan Data
Well, obviously a problem exists. The four items that any
high speed GMLAN module needs to communicate over the
network are power, ground, data lines, and discrete
communications enable signal voltage. Checking the
resistance between terminals 6 and 14 in the DLC shows 61
ohms and all other high speed modules are communicating so
data line problems are unlikely
I unplugged the EBCM and checked both B+ inputs with a test
lamp - OK - Looking at the single ground connection, I saw
the terminal partially unseated and backed out. Why? It was
probably not fully seated on initial assembly but was
touching well enough for a connection. There was a large
dent on the left front fender in the area of the EBCM.
Possibly this completed the unseating of the terminal. I
popped the CPA out and fully seated the terminal and
reseated the CPA. It locked in place well. After
reassembling, all the lights went out and I cleared all
codes and took another look at the High Speed data lines.
2014 Chevrolet Cruze LS, ECM/Inputs/Outputs Scan Data
Fast and easy - Probably a 30 minute diagnosis and repair.
Hope it helps someone out in the future.
James from Florida
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