LTM / HCM / LED / Programming guide

LIGHTING & HEADLAMP CONTROL MODULES

Drive LED arrays, adaptive beams, leveling, cornering and exterior-lighting functions.

MODULE GUIDE24/38

01Lamp-controller software update

02Replacement LED-driver coding

03Market / beam variant setup

04Leveling and swivel calibration

PROGRAMMING DECISION GATES

Identify, protect and recover the operation

Do not treat every service event as a simple flash. Determine what must be transferred, authorized, calibrated and verified before writing software.

01 / IDENTIFY

Define the operation

  • Separate a software update from replacement setup, coding, security pairing and calibration.
  • Record the current software, part number, VIN and configuration before changing anything.
02 / COMPATIBILITY

Pass the compatibility gate

  • Confirm part number, hardware level, supersession, region, options and new-versus-used restrictions.
  • Verify the OEM tool, subscription, interface and required security credentials.
03 / PRESERVE

Protect data and sequence

  • Save the pre-scan, identification, as-built data and learned values the procedure permits you to restore.
  • Follow the OEM module order, ignition states and CAN FD or DoIP transport requirements exactly.
04 / RECOVER

Respond to interruption

  • Do not cycle the ignition or disconnect power unless the OEM recovery prompt directs it.
  • Preserve the error, verify support voltage and communication, then use the approved recovery or bootloader routine.

NETWORK & PROGRAMMING ACCESS

Likely architecture paths

These are common implementations, not a vehicle-specific pinout. Confirm the exact topology, protocol and gateway route in current OEM service information before connecting or programming.

VEHICLE COMMUNICATION

Possible networks

Body CAN/CAN FD is common; LIN often connects lamp drivers, leveling motors and lighting submodules. Some pixel lamps use Automotive Ethernet.

DIAGNOSTIC TRANSPORT

Programming access

UDS over CAN/CAN FD is typical; large intelligent-lamp packages may use DoIP through a gateway.

PROGRAMMING TOPOLOGY

Critical online dependencies

BCM, ride-height sensors, steering-angle data, ADAS camera and both lamp controllers may need compatible configuration.

BEFORE CONNECTING

✓ Correct part number, hardware level and software package✓ OEM service information, application and active subscription✓ Approved interface and stable OEM-specified support supply✓ Complete pre-scan, identification and configuration saved✓ Communication, power and ground faults resolved

COMPLETE PROGRAMMING SEQUENCE

  1. Save lamp identity, market coding, ride-height values and DTCs.
  2. Verify correct lamp assembly, mounting, supply and mechanical aim.
  3. Program the correct side, vehicle, region and feature package.
  4. Run leveling, swivel or matrix-light calibration with approved equipment.
  5. Verify beam pattern, warnings, turn functions and network commands.

POST-PROGRAMMING VERIFICATION

  • Identification and calibration match the intended repair
  • Every required setup or calibration reports complete
  • No programming, configuration or communication DTCs return
  • System operation is confirmed under safe operating conditions
VEHICLE-SPECIFIC DATA WINS

Software, subscriptions, security access, voltage targets and ignition sequences vary by manufacturer and model.

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