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Headlight Control Module (Hcm) Diagnostic Trouble Codes: Diagnosis Volvo XC70 II

Headlights 4 illustrations ~6472 words

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B103C04

Condition

The Headlamp Control Module (HCM) communicates with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Left headlamp control unit (LHCU) detects an internal fault.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Scheme 11

Scheme 11
Scheme 11

Substitute Value

  1. Shortest headlamp range will be used.

Possible Source

  1. Damaged Left headlamp control unit (LHCU).

Fault symptom[s]

  1. Faulty low beam adjustment
  2. Automatic vertical aim control does not work
  3. Active Bi-Xenon light; No Functionality
  4. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B103D04

Condition

The Headlamp Control Module (HCM) communicates with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Right headlamp control unit (RHCU) detects an internal fault.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. Shortest headlamp range will be used.

Possible Source

  1. Damaged Right headlamp control unit (RHCU).

Fault symptom[s]

  1. Faulty low beam adjustment
  2. Automatic vertical aim control does not work
  3. Active Bi-Xenon light; No Functionality
  4. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B104076

Condition

The Headlamp Control Module (HCM) checks the location of the Left headlamp control unit (LHCU) and the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The left headlamp control unit (LHCU) is installed on the right-hand side or vice versa.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Cable harness for the Right headlamp control unit (RHCU) is connected to the Left headlamp control unit (LHCU).
  2. Cable harness for the Left headlamp control unit (LHCU) is connected to the Right headlamp control unit (RHCU).
  3. The Right headlamp control unit (RHCU) is programmed with incorrect software.
  4. The Left headlamp control unit (LHCU) is programmed with incorrect software.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Faulty low beam adjustment
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B104154

Condition

The Headlamp Control Module (HCM) checks internal components and functions.

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The position sensors are not calibrated.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Scheme 12

Scheme 12
Scheme 12

Substitute Value

  1. Shortest headlamp range will be used.

Possible Source

  1. Position sensors are not calibrated.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B104251

Condition

The Headlamp Control Module (HCM) checks internal components and functions.

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. An internal software fault has occurred.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. Shortest headlamp range will be used.

Possible Source

  1. Incorrect software in Headlamp Control Module (HCM).
  2. Damaged Headlamp Control Module (HCM).

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B104301

Condition

The Headlamp Control Module (HCM) checks the signal from the position sensors.

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Incorrect signal from front position sensor.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Scheme 13

Scheme 13
Scheme 13

Substitute Value

  1. Shortest headlamp range will be used.

Possible Source

  1. Short-circuit to battery voltage in the signal cable to the front / rear position sensor.
  2. Short-circuit to ground in the signal cable to the front / rear position sensor.
  3. Open-circuit in the signal cable to the front / rear position sensor.
  4. Damaged sensor.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B10431C

Condition

The Headlamp Control Module (HCM) checks the signal from the position sensors.

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Signal outside its permitted range from front position sensor.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. Shortest headlamp range will be used.

Possible Source

  1. Short-circuit to battery voltage in the signal cable to the front / rear position sensor.
  2. Short-circuit to ground in the signal cable to the front / rear position sensor.
  3. Open-circuit in the signal cable to the front / rear position sensor.
  4. Damaged sensor.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B104401

Condition

The Headlamp Control Module (HCM) checks the signal from the position sensors.

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Incorrect signal from rear position sensor.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. Shortest headlamp range will be used.

Possible Source

  1. Short-circuit to battery voltage in the signal cable to the front / rear position sensor.
  2. Short-circuit to ground in the signal cable to the front / rear position sensor.
  3. Open-circuit in the signal cable to the front / rear position sensor.
  4. Damaged sensor.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B10441C

Condition

The Headlamp Control Module (HCM) checks the signal from the position sensors.

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Signal outside its permitted range from rear position sensor.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. Shortest headlamp range will be used.

Possible Source

  1. Short-circuit to battery voltage in the signal cable to the front / rear position sensor.
  2. Short-circuit to ground in the signal cable to the front / rear position sensor.
  3. Open-circuit in the signal cable to the front / rear position sensor.
  4. Damaged sensor.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1A5701

Condition

The Headlamp Control Module (HCM) communicates with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Left headlamp control unit (LHCU) registers the vertical motor circuit has incorrect voltage or too high temperature.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Faulty power supply.
  2. Damaged Left headlamp control unit (LHCU).
  3. Temperature too high.
  4. Short-circuit to supply voltage in the signal cable.
  5. The signal cable is short-circuited to ground.
  6. Open circuit on signal cable.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1A5801

Condition

The Headlamp Control Module (HCM) communicates with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Right headlamp control unit (RHCU) registers that the vertical motor circuit has incorrect voltage or too high temperature.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Faulty power supply.
  2. Damaged Right headlamp control unit (RHCU).
  3. Temperature too high.
  4. Short-circuit to supply voltage in the signal cable.
  5. The signal cable is short-circuited to ground.
  6. Open circuit on signal cable.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1D6401

Condition

The Headlamp Control Module (HCM) communicates with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Left headlamp control unit (LHCU) registers an internal fault or too high temperature in the horizontal motor circuit.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Damaged Left headlamp control unit (LHCU).
  2. Temperature too high.
  3. Short-circuit to supply voltage in the signal cable.
  4. The signal cable is short-circuited to ground.
  5. Open circuit on signal cable.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1D6477

Condition

The Headlamp Control Module (HCM) communicates with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Left headlamp control unit (LHCU) registers that the requested position of the horizontal motor circuit cannot be achieved.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Blocked engine (the engine does not turn over)
  2. Damaged horizontal motor.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1D6501

Condition

The Headlamp Control Module (HCM) communicates with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Right headlamp control unit (RHCU) registers an internal fault or too high temperature in the horizontal motor circuit.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Damaged Right headlamp control unit (RHCU).
  2. Temperature too high.
  3. Short-circuit to supply voltage in the signal cable.
  4. The signal cable is short-circuited to ground.
  5. Open circuit on signal cable.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1D6577

Condition

The Headlamp Control Module (HCM) communicates with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Right headlamp control unit (RHCU) registers that the requested position of the horizontal motor circuit cannot be achieved.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Blocked engine (the engine does not turn over)
  2. Damaged horizontal motor.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1D6601

Condition

The Headlamp Control Module (HCM) communicates with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Left headlamp control unit (LHCU) registers incorrect system voltage.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

Signal too high

  1. The charging system is overcharging.

Signal too low

  1. Short-circuit to ground in the power supply cable.
  2. Open-circuit in the ground lead.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1D6701

Condition

The Headlamp Control Module (HCM) communicates with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The Right headlamp control unit (RHCU) registers incorrect system voltage.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

Signal too high

  1. The charging system is overcharging.

Signal too low

  1. Short-circuit to ground in the power supply cable.
  2. Open-circuit in the ground lead.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1D6801

Condition

The bulb housing has a sensor for side control. The sensor is checked by Left headlamp control unit (LHCU). The Headlamp Control Module (HCM) communicates with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Left headlamp control unit (LHCU) detects incorrect signal from sensor side control.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Contact resistance, oxidation or poor contact in connections.
  2. Damaged sensor.
  3. Damaged Left headlamp control unit (LHCU).

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-B1D6901

Condition

The bulb housing has a sensor for side control. The sensor is checked by Right headlamp control unit (RHCU). The Headlamp Control Module (HCM) communicates with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Right headlamp control unit (RHCU) detects incorrect signal from sensor side control.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Contact resistance, oxidation or poor contact in connections.
  2. Damaged sensor.
  3. Damaged Right headlamp control unit (RHCU).

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U000100

Condition

The control modules transmit and receive information via a standardized serial communication method - CAN (Control Area Network).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Communication on the CAN network is interrupted by another control module on the CAN network or by the control module's own message causing interference on the CAN network.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Starting the control module's CAN communication.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met. In the event of system communication problems, it is not possible to communicate with the control module. Therefore it will only be possible to read off the fault if it is intermittent.

Substitute Value

  1. Control module shuts itself off ("bus-off").

HINT: The control module is off until the power supply has been broken. When the power supply is connected the control module will make a new attempt to communicate.

Possible Source

  1. Short-circuit between the control area network (CAN) wiring.
  2. Open-circuit in the control area network (CAN) wiring.
  3. Internal fault in another control module in the same part of the control area network (CAN).
  4. Internal fault in the control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U010000

Condition

The control module is continually supplied with necessary information from the Engine control module (ECM) via CAN communication. The control module checks the communication with the Engine control module (ECM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. No communication with the Engine control module (ECM).

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U012100

Condition

The control module is continually supplied with necessary information from the Brake control module (BCM) via CAN communication. The control module checks the communication with the Brake control module (BCM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. No communication with the Brake control module (BCM).

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U012200

Condition

The control module is continually supplied with necessary information from the Suspension module (SUM) via CAN communication. The control module checks the communication with the Suspension module (SUM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. No communication with the Suspension module (SUM).

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U012600

Condition

The control module is continually supplied with necessary information from the Steering wheel angle sensor module (SAS) via CAN communication. The control module checks the communication with the Steering wheel angle sensor module (SAS).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. No communication with the Steering wheel angle sensor module (SAS).

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U014000

Condition

The control module continually supplies necessary information from the Central electronic module (CEM) via CAN communication. The control module checks the communication with the Central electronic module (CEM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. No communication with the Central electronic module (CEM).

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U030000

Condition

The control modules communicate with each other for exchange of information in a network via a standardized serial communication procedure - CAN (Controller Area Network). The Central electronic module (CEM) regularly transmits messages on the CAN network. These messages contain information about which signal configuration ID applies to the vehicle. The control modules on the CAN network have the same signal configuration ID so that they can communicate with each other.

The control module compares its configuration ID with the signal configuration transmitted on the control area network (CAN) by the central electronic module (CEM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The control module's configuration ID differ from the ID that the Central electronic module (CEM) transmits.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Starting the control module's CAN communication.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. Control module shuts itself off ("bus-off"). NOTE: When the diagnostic trouble code (DTC) is stored, the control module responds to the diagnostic commands.

Possible Source

  1. Incorrect configuration ID (the control module is not intended for this vehicle, for example it is a used control module with different software/hardware).
  2. Open-circuit in the CAN cables between the control module and the Central Electronic Module (CEM).

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U040181

Condition

The control module is continuously supplied with information about current outdoor temperature from Engine control module (ECM) via CAN-communication. The control module checks the quality of the information from the Engine control module (ECM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Information from Engine control module (ECM) is incorrect/unreasonable.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Faulty outside temperature sensor.
  2. Fault-trace in transmitting control module.

Fault symptom[s]

  1. None.

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U041881

Condition

The control module is continually supplied with necessary information from the Brake control module (BCM) via CAN communication. The control module checks the quality of the information from the Brake control module (BCM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Transmitting control module indicates a lower quality level of information than the Headlamp Control Module (HCM) accepts.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U042881

Condition

The control module is continually supplied with necessary information from the Steering wheel angle sensor module (SAS) via CAN communication. The control module checks the quality of the information from the Steering wheel angle sensor module (SAS).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Transmitting control module indicates a lower quality level of information than the Headlamp Control Module (HCM) accepts.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U043A86

Condition

The control module is continually supplied with necessary information from the Suspension module (SUM) via CAN communication. Suspension module (SUM) sends sensor signals from front and rear position sensors to the control module. The control module checks that the value of the signal is within valid range.

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The value of the signal is outside valid range, 0 to +5V.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U054283

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The control module checks the communication with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Received message does not correspond with expected message.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Communication interference.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U054286

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The control module checks the communication with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Received message does not correspond with expected message.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Communication interference.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U054383

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The control module checks the communication with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Received message does not correspond with expected message.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Communication interference.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U054386

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The control module checks the communication with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Received message does not correspond with expected message.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Communication interference.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U1A3801

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The control module checks the communication with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. No communication with the Left headlamp control unit (LHCU).

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. The signal cable is short-circuited to ground.
  2. Short-circuit to supply voltage in the signal cable.
  3. Contact resistance, oxidation or open-circuit in the terminals.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U1A3887

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The control module checks the communication with the Left headlamp control unit (LHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. No communication with the Left headlamp control unit (LHCU).

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Open circuit on signal cable.
  2. Damaged Left headlamp control unit (LHCU).
  3. Contact resistance, oxidation or open-circuit in the terminals.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U1A3901

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The control module checks the communication with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. No communication with the Right headlamp control unit (RHCU).

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. The signal cable is short-circuited to ground.
  2. Short-circuit to supply voltage in the signal cable.
  3. Contact resistance, oxidation or open-circuit in the terminals.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U1A3987

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The control module checks the communication with the Right headlamp control unit (RHCU).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. No communication with the Right headlamp control unit (RHCU).

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Open circuit on signal cable.
  2. Damaged Right headlamp control unit (RHCU).
  3. Contact resistance, oxidation or open-circuit in the terminals.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U210000

Condition

Headlamp Control Module (HCM) receives information about current vehicle configuration from Central electronic module (CEM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Vehicle configuration from central electronic module (CEM) is lost.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Control module supplied with power for at least 5 seconds.
  2. Engine running.

Scheme 14

Scheme 14
Scheme 14

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U210100

Condition

Headlamp Control Module (HCM) receives information about current vehicle configuration from Central electronic module (CEM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Vehicle configuration from Central electronic module (CEM) is incorrect.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Control module supplied with power for at least 5 seconds.
  2. Engine running.

Substitute Value

  1. None.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Active Bi-Xenon light; No Functionality
  2. Automatic vertical aim control does not work

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U300004

Condition

The Headlamp Control Module (HCM) checks internal components and functions.

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Internal components do not work.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Damaged Headlamp Control Module (HCM).

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U300316

Condition

The Headlamp Control Module (HCM) checks its own system voltage by comparing the DC voltage to the system voltage in the Central electronic module (CEM). Information about the system voltage in the Central electronic module (CEM) is transmitted via CAN to the Headlamp Control Module (HCM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Direct voltage to control module is lower than 9.0 V.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Contact resistance, oxidation or open-circuit in the terminals.
  2. Low battery
  3. Short-circuit to ground in the power supply.
  4. Damaged fuse.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U300317

Condition

The Headlamp Control Module (HCM) checks its own system voltage by comparing the DC voltage to the system voltage in the Central electronic module (CEM). Information about the system voltage in the Central electronic module (CEM) is transmitted via CAN to the Headlamp Control Module (HCM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. Direct voltage to control module is higher than 16.0 V.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. The charging system is overcharging.
  2. Damaged generator (GEN).
  3. Damaged battery.

Fault symptom[s]

  1. Automatic vertical aim control does not work
  2. Active Bi-Xenon light; No Functionality
  3. Text window and warning symbol/Text message

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-U300362

Condition

Note. This trouble code is only relevant for troubleshooting and action in the following cases

  1. The trouble code is active in the present driving cycle and has been active for a longer period of time.
  2. The customer experiences malfunction that can be attributed to the trouble code.

The Headlamp Control Module (HCM) checks the internal system voltage by comparing it to the system voltage in the Central electronic module (CEM).

Information about the system voltage in the Central electronic module (CEM) is transmitted via CAN to the Headlamp Control Module (HCM).

The diagnostic trouble code (DTC) is stored if the control module detects that

  1. The system voltage differs by more than 2.5 V.

The control module's test for the diagnostic trouble code (DTC) starts in the event of

  1. Ignition switch position II.

Note. The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute Value

  1. None.

Possible Source

  1. Contact resistance, oxidation or open-circuit in the terminals.

Fault symptom[s]

  1. Headlights/Headlight aim is off
  2. Headlights/Vertical adjustment not influenced by steering wheel

More articles — Headlight Control Module (Hcm) Diagnostic Trouble Codes