3500 4x4 Pickup L6-359 5.9L DSL Turbo (1996)
Data Link Connector: Description and Operation
CIRCUIT OPERATION
Circuit M1 supplies battery voltage to the data link connector. Circuit M1 originates at cavity 7 of Joint Connector B.
Circuit D20 connects to cavity C29 of the Powertrain Control Module (PCM). Circuit D20 is the SCI receive circuit for the PCM.
Circuit D21 connects to cavity C27 of the PCM. Circuit D21 is the SCI transmit circuit for the PCM.
Circuits Z11 and Z12 provide ground for the data link connector.