V70R L5-2.5L Turbo VIN 52 B5254T4 (2007)
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
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 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,
contact resistance and 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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Checking wiring and terminals See: Testing and Inspection/Component Tests and General Diagnostics/Checking Wiring and Terminals/Checking
Wiring And Terminals
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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.
Continue - DONE
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Description Of Parameters
Description of parameters
Parameters, value
Power supply, value
Measurement range 6 - 20 V.
Indicates the power supply to the headlamp control module (HCM).
The normal value when the alternator is charging: 13.0-14.5 V.
Steering wheel angle, value
Measurement range: -780 to +780°.
Indicates current steering wheel angle.
The normal value when the steering wheel and front wheels point straight ahead is approx. 0°.
Description Of Reading Off Of Extended Diagnostic Trouble Code (DTC) Information
Description of reading off of extended diagnostic trouble code (DTC) information
Description of frozen values See: Scan Tool Testing and Procedures/Description of Frozen Values, HCM
Description of status identifier See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and
Procedures/Vehicle Communication Information, Engine Control Module (ECM)/Description of Status Identifier
Description of counter See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Vehicle
Communication Information, Engine Control Module (ECM)/Description of Counter
Description of Frozen Values, HCM
Description of frozen values
Explanation
Frozen values are parameter values that are stored when a diagnostic trouble code is generated. Not all parameters can be read out for all diagnostic
