Adamtheviking

So a while back my wiring harness got wrapped around my drive line and I have been getting the trouble code for the heater circuit on my bank 2 sensor2 02 sensor. I wired a new connector on the harness side and got a new sensor but still the code. I assume one of the wires got stretched and broke and I don't want to take out the transmission and disect the harness so I want to run 4 new wires from the plug to wherever they terminate but I can't find a schematic anywhere. The truck is a 2001 1500 4x4 suburban with a 5.3L.

mountainmanjoe

try charm.li

Adamtheviking

Thanks for the diagram. Now I just gotta figure out how in the hell to read it.

mountainmanjoe

it's not difficult. Obviously lines are wires, and the colors are labeled as well as the wire gauges in square mm. There are conversion charts online. For example 0.8 is equivalent to 20 AWG.
All connectors and pins are labeled. 'C1', 'C2' etc are connectors. For example O2 sensor 2 pin 'C' is connected to pin E8, connector 2 on the junction block.
You probably want to look up some connector end views, and component locators in the manual as well.

'S' is a splice
'G' is a ground
and the numbers are zone codes, so G104 is a grounding point under the hood.

Adamtheviking

Thanks again. So I think I can figure out where the ground is. I know where the PCM and fuse power block are but what is going on with the tan wire? Like am I looking for a connector with a bunch of tan wires in it or what? Or can I take my new tan wire straight to one of the terminals on the PCM? If so, which one?

mountainmanjoe

Tan is all common. It's all the same low reference circuit (#413 according to the diagram). The diagram says they are spliced together at S114 (again, zone 100 is under the hood)


depends where the wires broke off. I would do this repair in the least invasive way possible, and splice together what's left. As long as they're tan on tan it shouldn't matter.