Component Tests and General Diagnostics

Checking the power supply and ground terminal

Power supply Headlamp Control Module (HCM)
Headlamp Control Module (HCM) is supplied with voltage via a voltage input on the control module.
When the ignition is on, the power input is powered and the control module is in active mode.
- Voltage input #3 F is supplied with voltage via a fuse from central electronic module (CEM). It will not be possible to activate the control module if there is an open-circuit.

Checking the power supply
Check the voltage feed cable from the Central electronic module (CEM) #7:1 to the Headlamp Control Module (HCM) #3 F for open-circuit, loose connections, contact resistance and oxidation. Check the fuse. The voltage must be approximately battery voltage.

Ground terminal Headlamp Control Module (HCM)
Headlamp Control Module (HCM) 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 #2 F is power ground and connected to the ground connection in the body.

Checking the ground terminal
Check the ground cable between the Headlamp Control Module (HCM) #B2 F and ground connection for open-circuit, loose connections, contact resistance or oxidation. At ignition on, the voltage-drop between Headlamp Control Module (HCM) ground connection and chassis connection may not be greater than 0.5 V.
Remedy as necessary.

Other information
- Signal specification Signal Specification, Headlamp Control Module (HCM)
- See the relevant wiring diagram for information about circuits and ground terminals in the bodywork.
- Checking wiring and terminals Checking Wiring and Terminals

Continue - DONE

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