S40 2.4i L5-2.4L VIN 38 B5244S4 (2008)
Headlamp Control Module: 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.
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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.
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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
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Signal specification See: Pinout Values and Diagnostic Parameters
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See the relevant wiring diagram for information about circuits and ground terminals in the bodywork.
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Checking wiring and terminals See: Testing and Inspection/Component Tests and General Diagnostics/Checking Wiring and Terminals
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