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Headlight Control Module (Hcm) Diagnostic Trouble Codes: Diagnosis Volvo V50 I рестайлинг

Headlights 1 illustration ~4971 words

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-0142

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. Activated control module.

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 1

Scheme 1
Scheme 1

Substitute Value

  1. None.

Possible Source

  1. Damaged Headlamp Control Module (HCM).

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-0142

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2281

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. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2281

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2283

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. Activated control module.

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. None.

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2283

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2285

Condition

Headlamp Control Module (HCM) checks software in the control module.

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

  1. The software is faulty.

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

  1. Start-up of the control module.

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. Limited functionality in the Headlamp Control Module (HCM)
  2. Shortest headlamp range will be used.

Possible Source

  1. Incorrect internal parameter file.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2285

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2287

Condition

Headlamp Control Module (HCM) receives information about the current power supply position from Central electronic module (CEM).

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

  1. An expected message from the central electronic module (CEM) indicating the power mode has not come.
  2. A message indicating that power mode from the central electronic module (CEM) is incorrect or invalid.

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

  1. Activated control module.

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. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2287

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2289

Condition

Headlamp Control Module (HCM) checks if reverse gear (R) is engaged. In cars with an automatic transmission, the signal comes from the transmission control module (TCM). In vehicles equipped a manual transmission, the signal comes from the central electronic module (CEM). If reverse gear (R) is engaged, the lateral control shall not be activated.

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

  1. Information from transmitting control module about reverse gear (R) missing.
  2. 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. Activated control module.

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. Headlamp Control Module (HCM) assumes that reverse gear (R) is not engaged. This means that the function lateral control according to steering angle is activated despite reverse gear (R) being engaged.

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2289

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2291

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. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. Incorrect data for vehicle configuration in the Central electronic module (CEM).
  2. Headlight Control Module (HCM) not intended for this car, e. g., used control module with other hardware/software.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2291

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2293

Condition

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

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

  1. Information about vehicle position from Central electronic module (CEM) missing.

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

  1. Activated control module.

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. Normal mode

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. None

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2293

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2295

Condition

Headlamp Control Module (HCM) receives information about the control's position on Light switch module (LSM). Signal is sent via the central electronic module (CEM).

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

  1. Information about control's position on Light switch module (LSM) missing.

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

  1. Activated control module.

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. Headlamp Control Module (HCM) assumes that lateral control according to steering angle is active (control for light switch in position "3").

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. None.

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2295

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2297

Condition

The Headlamp Control Module (HCM) is continually supplied with information about the current light conditions. The central electronic module (CEM) receives information about the prevailing light conditions from the twilight sensor.

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

  1. Information about current light conditions from Central electronic module (CEM) missing.

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

  1. Activated control module.

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. Headlamp Control Module (HCM) assumes that existing light condition is night (lateral control according to steering angle active).

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. None

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2297

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2687

Condition

Headlamp Control Module (HCM) receives information about current steering angle from Steering wheel module (SWM).

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

  1. Interrupted or missing communication with the Steering wheel module (SWM).

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2687

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2987

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. Interrupted or missing communication with the Brake control module (BCM).

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. Fault-trace in transmitting control module.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Vertical adjustment not influenced by steering wheel
  3. Headlights/Headlight aim is off

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-2987

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6401

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. Left headlamp control unit (LHCU) registers an electric problem in the circuit for the horizontal motor.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

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

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6401

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6402

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. Left headlamp control unit (LHCU) registers an electric problem in the circuit for the vertical motor.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

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

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6402

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6403

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 position sensor in Left headlamp control unit (LHCU) is outside the tolerance level.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

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

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6403

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6501

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. Right headlamp control unit (RHCU) registers an electric problem in the circuit for the horizontal motor.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

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

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6501

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6502

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. Right headlamp control unit (RHCU) registers an electric problem in the circuit for the vertical motor.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

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

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6502

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6503

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 position sensor in Right headlamp control unit (RHCU) is outside the tolerance level.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

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

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-6503

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F20

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

  1. Incorrect signal from rear position sensor.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. Short-circuit to supply voltage in the signal cable.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F20

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F21

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

  1. Incorrect signal from rear position sensor.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. The signal cable is short-circuited to ground.
  2. Open circuit on signal cable.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F21

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F22

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. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. Position sensors are not calibrated.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F22

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F30

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

  1. Incorrect signal from front position sensor.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. Short-circuit to supply voltage in the signal cable.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F30

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F31

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

  1. Incorrect signal from front position sensor.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. The signal cable is short-circuited to ground.
  2. Open circuit on signal cable.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F31

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F40

Condition

Headlamp Control Module (HCM) supplies voltage to the position sensors.

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

  1. Direct current (DC) is too high.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. The cable for voltage feed is short-circuited to voltage.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F40

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F41

Condition

Headlamp Control Module (HCM) supplies voltage to the position sensors.

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

  1. Direct current (DC) is too low.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

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

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-8F41

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD00

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network).

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. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. Communication interference.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD00

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD01

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network).

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

  1. Communication is incorrect or missing.

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

  1. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

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. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD01

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD02

Condition

The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network).

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. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

Possible Source

  1. Communication interference.

Fault symptom[s]

  1. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD02

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD10

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. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

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. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD10

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD11

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. Activated control module.

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. Limited functionality in the Headlamp Control Module (HCM)

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. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-DD11

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-E000

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. Activated control module.

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 one or both CAN cables.
  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. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-E000

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-E003

Condition

The control modules transmit and receive information via a standardized serial communication method - CAN (Control 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. Activated control module.

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").

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. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-E003

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-E010

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. System voltage in Headlamp Control Module (HCM) is at least 2.5 V lower than system voltage in Central electronic module (CEM).

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

  1. Engine running.

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. 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. Text window and warning symbol/Text message
  2. Headlights/Headlight aim is off
  3. Headlights/Vertical adjustment not influenced by steering wheel

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION HCM-E010

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