Test B: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool

PINPOINT TEST B: THE TRANSMISSION CONTROL MODULE (TCM) DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The TCM communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the TCM. The TCM shares the HS-CAN with the PCM, the ABS module, the restraints control module (RCM), the 4X4 control module (if equipped), the air suspension module (if equipped) and the instrument cluster (IC). Voltage for the TCM is provided by circuits CBB73 (WH/BN) and SBB37 (GY/RD). Circuit GD113 (BK/YE) provides ground.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- TCM

B1-B3:

B3-B4: