LS1MCSS

iTrader: (18)

I am modifying a harness from an 04 avalanche for my next swap. I have two different wires to chose from for the Data Link Connector. They are listed below. Which one do I need to use?

C1-58 PCM Class 2 Serial Data dark green
C1-59 Class 2 Serial Data yellow

lsxRanger94

pin 58 http://www.lt1swap.com/2004vortec_pcm.htm

LS1MCSS

iTrader: (18)

Thanks

the_merv

iTrader: (88)

I would go with the 58..

G-Body

iTrader: (4)

Yep 58 dark green is what GM uses to go to the DLC. The yellow wire on pin 59 goes to the BCM. It would probably work, but I prefer to follow GM`s lead as much as possible.

the_merv

iTrader: (88)

I don't see that Yellow one working honestly, it's the line to the BCM to communicate certian functions.

For example in a truck that turns the little Tow/Haul light on.