Component Tests and General Diagnostics

Checking the power supply and ground terminal

Power supply High Level Display Front (HLDF)
High Level Display Front (HLDF) is supplied with voltage via a voltage input on the control module.
- Power input 1 terminal #C2:1 is supplied with +30 via a fuse in the rear relay/fusebox from the battery.

Checking the power supply
Check the power supply cable from the battery to High Level Display Front (HLDF) terminal #C2:1. Check for an open-circuit. Check for loose connections, contact resistance and oxidation. Check the fuse. The voltage must be approximately battery voltage.

Ground terminal High Level Display Front (HLDF)
The High Level Display Front (HLDF) has a ground input. The ground input from the control module is connected to a ground terminal in the body via a ground lead. See the relevant wiring diagram for further information about the ground terminal.
- Ground input 1, #C2:5 is power ground and is connected to the ground connection in the body.

Checking the ground terminal
Check the ground cable between the High Level Display Front (HLDF) terminal #C2:5 and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance and oxidation. At ignition on, the voltage-drop between High Level Display Front (HLDF) ground connection and chassis connection may not be greater than 0.5 V.
Remedy as necessary.

Other information
- Signal specification Pinout Values and Diagnostic Parameters
- See the relevant wiring diagram for information about circuits and ground terminals in the bodywork.
- Checking wiring and terminals Checking Wiring and Terminals

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