OBC / INV / DC-DC / Programming guide

EV POWER ELECTRONICS & CHARGING

Control traction inverters, onboard charging, DC-to-DC conversion, charge communication and high-voltage thermal strategy.

MODULE GUIDE13/38

01Inverter / drive-unit update

02Onboard charger programming

03DC-to-DC converter setup

04Charge-control module configuration

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

High-speed CAN/CAN FD is typical; Automotive Ethernet appears in newer EV domains. LIN may connect pumps, valves, charge-port devices and smart cooling components; charger pilot/proximity circuits are dedicated interfaces, not vehicle CAN.

DIAGNOSTIC TRANSPORT

Programming access

UDS over CAN/CAN FD or DoIP may be used. Inverter, onboard charger, DC/DC and charge-control software can be released as one coordinated compatibility set.

PROGRAMMING TOPOLOGY

Critical online dependencies

BECM/HPCM, gateway, motor resolver, thermal controller, charge-port controller and isolation monitoring must be healthy. Maintain the OEM-defined HV and 12-volt state throughout programming.

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 charger, inverter, isolation and thermal-system data.
  2. Confirm 12-volt support and OEM high-voltage safety state.
  3. Program coordinated power-electronics modules in sequence.
  4. Verify isolation, coolant flow, AC/DC charging and propulsion readiness.

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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