Checking the Power Supply and Ground Terminals Power Supply, Phone Module (PHM)

Checking The Voltage/Ground Terminal, Phone Module (PHM)

Checking the power supply and ground terminals Power supply, phone module (PHM)





The phone module (PHM) is powered via a power input on the control module.

Power input #A5 (#5) is supplied with +30 from the battery via a fuse. It will not be possible to activate the carphone if there is an open-circuit.

Checking the power supply
Check the power supply cable from the battery to phone module (PHM) terminal #A5 (#5). 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.

Ground terminal, phone module (PHM)
The phone module (PHM) has a ground input. The ground input from the control module is power ground and is connected to the ground terminal in the car body.

Checking the ground terminal
Check the ground lead between phone module (PHM) terminal #A6 (#6) and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the ground connection and the ground terminal must not be greater than 0.5 V.

Remedy as necessary.

Other information
- Connecting the breakout box
- Signal specification
- Checking wiring and terminals.

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