DTC C1789: Vehicle Identification Malfunction [09/2014 - ]: Description

When the absorber control ECU has not acquired the vehicle identification information, DTC C1789 is stored. When the vehicle identification information is correctly acquired, this DTC is cleared. Vehicle identification information is automatically acquired when the system enters test mode.
If an incorrect power management control ECU is installed, the vehicle specification and data will not match and DTC C1789 will be stored.

DTC Code	Detection Condition	Trouble Area
C1789	Either condition is met: The vehicle identification information is not stored. Vehicle identification information that is different from the stored information has been received 3 times.	CAN communication system Vehicle identification information Power management control ECU Absorber control ECU