Intermittent Ipc Class 2 Serial Data Communication. Dtc U1000

[BigSilver]

I posted this topic originally to the "Full Size Truck & Suv" forum, but think it'd be better answered here.

 

2003 Chevy Suburban, 2500, 6L:

Intermittent IPC Class 2 serial data communication. DTC U1000.

 

I’ve checked the +ve and -ve pin connections on the IPC wire loom

(pins B11, B9 are +ve voltage, and B12 and A12 are ground) and

all are functional in Accessory and Run modes.

 

Pin A6, the Class2 serial data input feed is what needs to be verified,

or at least the wire feed itself, that supplies the serial data.

 

How would one go about testing for the serial data on the input lead A6,

without the IPC?

 

Where could one locate the opposite end of the input wire feed of the

Class2 serial data input feed, to determine if its sound? At the BCM module, radio, or elsewhere?

 

I eliminated the posibillities of poor printed circuit board connections by

soldering redundant traces for the respective input leads, that could

affect the IPC. That being the input power lines, ground lines and the

Class2 serial data line. See photos.

[BigSilver]

BUMP

 

Any techy have an idea from where, behind the dashboard, the Class2 serial data line originates from?