Power supply, ground and bus communication

The control module is powered on pin 33 (A) with +30 voltage and on pins 31 (A) and 22 (A) with +15 voltage. The module is grounded via pins 32 (A) and 23 (A) to grounding point G33T. Bus communication (P-bus) takes place on pins 25-26 (A) and 35-36 (A).

Fig 1: Identifying TCM Control Module Communication Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

PIN INTERFACE DESCRIPTION

Pin no.	Interface	Description
33 (A)	+ 30	Power supply
31 (A)	+ 15	Power supply
32 (A)	ground	Grounding point G33T
23 (A)	ground	Grounding point G33T
25 (A)	Bus	P-bus
26 (A)	Bus	P-bus
35 (A)	Bus	P-bus
36 (A)	Bus	P-bus

Fig 2: Identifying TCM Control Module Circuit Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

IMPORTANT: When handling the control module, it is important first to create a ground connection between yourself and for example the vehicle engine. Avoid touching the pins of the control module.