DTC U1009: Lost Communication With Radiator Shutter (Active Air Flap 2): General Description

CAN communication is possible via circuits. It has two communication lines, CAN HIGH, CAN LOW and two 120 Ω resistors (mounted to the ECU and BMS, respectively). So, each unit (HCU, ECU, MCU, BMS, LDC, FATC and AAF) can exchange data interchangeably.

The AAF exchanges data with each unit to control the engine or motor.