Component Tests and General Diagnostics

Checking the supply voltage/ground terminal

Checking the power supply and ground terminals

Power supply, traffic message channel module (TMC)
The traffic message channel module (TMC) is powered via a power input on the control module.
1. The power input terminal #1 (#B1) is powered via a fuse from the central electronic module (CEM). It will not be possible to activate the traffic message channel module (TMC) if there is an open-circuit.

Checking the power supply
Check the power supply cable from the battery to the central electronic module (CEM) and from the central electronic module (CEM) to traffic message channel module (TMC) terminal #1 (#B1). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Ground terminal, traffic message channel module (TMC)
The traffic message channel module (TMC) is connected to the chassis ground at fixed points in the body.

Checking the ground terminal
Check that the casing on the traffic message channel module (TMC) is properly connected to the body. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the mounting points for the control module and the body must not be greater than 0.5 V.
Remedy as necessary.

Other information
- Signal specification Signal Description, Traffic Message Channel Module (TMC)
- See the relevant wiring diagram for information about circuit and ground terminals in the bodywork
- Checking wiring and terminals Checking Wiring and Terminals






Continue - DONE

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