Volvo Workshop Manuals
XC90 FWD L6-3.2L VIN 98 B6324S (2007)
Relays and Modules > Relays and Modules - Lighting and Horns > Headlamp Control Module > Component Information > Testing and Inspection > Reading and Clearing Diagnostic Trouble Codes > Page 1184
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.
Power input 1 (#A1) is supplied power via a fuse from the system relay. This power input governs the supply of power to the Headlamp Control
Checking the power supply
Check the power supply cable from the system relay to headlamp control module (HCM) terminal #A1 for an open-circuit, loose connections, contact
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 input 1 #A6 is power ground and connected to the ground connection in the body.
Checking the ground terminal
Check the ground cable between headlamp control module (HCM) terminal #A6 and ground terminal. Check for an open-circuit, loose connections,
Checking wiring and terminals See: Testing and Inspection/Component Tests and General Diagnostics/Checking Wiring and Terminals
Signal specification, B8444S, B6324S See: Pinout Values and Diagnostic Parameters
See the relevant wiring diagram for information about circuits and ground terminals in the bodywork.
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