IMMO / RFA / Programming guide

SECURITY, IMMOBILIZER & KEYLESS ENTRY

Authorize starting, enroll keys and coordinate immobilizer, smart-entry and electronic steering-lock functions.

MODULE GUIDE11/38

01Immobilizer module replacement

02Key / fob enrollment

03Module security pairing

04Steering-lock or smart-entry setup

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 and LIN are common. Door handles, antennas and steering locks may use LIN or dedicated circuits; LF, UHF, NFC, Bluetooth and ultra-wideband are radio links, not CAN networks.

DIAGNOSTIC TRANSPORT

Programming access

Protected UDS sessions commonly run through the BCM or gateway. Key enrollment, immobilizer pairing and software programming are different functions and may require licensed security credentials.

PROGRAMMING TOPOLOGY

Critical online dependencies

BCM, ECM/PCM, immobilizer, steering-column lock, receiver and every available key/fob can be required. Some procedures erase all existing keys before new ones are accepted.

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. Verify ownership, credential and security-access requirements.
  2. Record every available key and the original module configuration.
  3. Perform programming and pairing in the required module order.
  4. Test every key, passive-entry zone, alarm and start authorization.

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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