Component Tests and General Diagnostics

Checking the voltage / ground terminal

Checking the power supply and ground terminals

Voltage supply, parking assistance module (PAM)
The parking assistance module (PAM) is powered via a power input on the control module.
Power input terminal #A1 is +15-supplied via the central electronic module (CEM) and a fuse from the ignition switch. The ignition switch is powered from the battery via the integrated relay/fusebox in the engine compartment. In the event of an open-circuit, park assist cannot be activated.

Checking the power supply
Check the power supply cable from the central electronic module (CEM) to parking assistance module (PAM) terminal #A1. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Also check the power supply from the battery via the integrated relay/fusebox and the ignition switch to the central electronic module (CEM). Check the fuses. The voltage must be approximately battery voltage.

Ground terminal, parking assistance module (PAM)
Parking assistance module (PAM) 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. See the relevant wiring diagram for further information about the ground terminals in the bodywork.

Checking the ground terminal
Check the ground lead between parking assistance module (PAM) terminal #A8 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 for the control module and the ground terminal must not be greater than 0.5 V.
Remedy as necessary.

Other information:
- Connecting the breakout box Connecting The Breakout Box, Parking Assistance Module (PAM)
- Signal specification, R.H.D Signal Specification, Parking Assistance Module (PAM) (LHD)
- Signal specification, L.H.D Signal Specification, Parking Assistance Module (PAM) (RHD)
- 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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