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

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

Normal Operation
The transmission control module (TCM) is present on Hybrid vehicles only. 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 network with the PCM, the traction battery control module (TBCM), the ABS module, the power steering control module, restraints control module (RCM), occupant classification sensor module and the instrument cluster. Voltage for the TCM is provided by circuits CBB27 (GN/BN) and SBB08 (VT/RD). Ground is provided by circuit GD121 (BK/YE).

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

H1-H3:

H4: