[Gmecm] DLC question

[WopOnTour]

Steve:
According to the wiring 2001 thru 2003 DLC wiring schematic, there should 
only be 4 wires to your DLC.(as you  indicated)
The green wire you have in pin 14 has likely been something added by some 
after market accessory or gage. While it's true pin 14 is designated for 
CAN, there was not CAN (GMLAN) implemented (at the DLC at least) into any GM 
truck in 2002. If there WAS (eg. as for the Parallel Hybrid Truck -PHT a 
couple years later in 2004)  it would be DUAL WIRE CAN (aka High Speed 
GMLAN) and therefore would also require there be a wire in pin 6 (HS GMLAN 
+). These wires are usually tan (pin 14 GMLAN HS-) and tan/wht  (pin 6 GMLAN 
HS+)  What do you measure on that wire with a DVOM or DSO??
Regards
WOT

----- Original Message ----- 
From: "Steve Ravet" <Steve.Ravet at arm.com>
To: <gmecm at diy-efi.org>
Sent: Saturday, August 04, 2007 9:37 PM
Subject: [Gmecm] DLC question


The schematics for my truck ('02 K1500) show 4 wires to the DLC:

pin 2:  class2 data
pin 4:  gnd
pin 5:  gnd
pin 16: Vbatt

But my actual connector has a fifth wire, green, on pin 14.  The OBD2
spec seems to say this is a CAN line, but if CAN were implemented there
would have to be a wire in pin 6 also, and there's not.  Any idea what
this wire might be?

thanks,
--steve

-------------------
Steve Ravet
ARM
steve.ravet at arm.com

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