C1789

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1789: Vehicle Identification Malfunction

DTC C1789 - Vehicle Identification Malfunction

DESCRIPTION

- This DTC is stored when the suspension control ECU is initialized, and is cleared when the vehicle identification information received through CAN communication is correctly stored in the EEPROM.
- DTC C1789 is stored as the vehicle specification and data do not match when an incorrect ECM or AFS ECU are installed.





INSPECTION PROCEDURE
NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- If DTC C1782 is output at the same time, perform troubleshooting for DTC C1782 first C1782.
- If the suspension control ECU is replaced with a new one, enter test mode and perform registration of vehicle identification information Testing and Inspection.
- Do not exchange the suspension control ECU with a normally functioning one from another vehicle to perform troubleshooting.

PROCEDURE

1. CHECK VEHICLE IDENTIFICATION INFORMATION STATUS
(a) Check that vehicle identification information has been stored Testing and Inspection.

Result





B -- PERFORM VEHICLE IDENTIFICATION INFORMATION REGISTRATION
A -- Continue to next step.

2. CHECK PART NUMBER
(a) Check that the part number of the installed ECM and AFS ECU are correct.
NOTE:
When removing the ECM and/or AFS ECU to check the part number, or when replacing the ECM and/or AFS ECU, be sure to follow the appropriate procedures and precautions Removal.

OK:
ECM and AFS ECU with correct part number are installed.
NG -- REPLACE CORRESPONDING ECU
OK -- Continue to next step.

3. CLEAR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
NEXT -- Continue to next step.

4. CHECK FOR DTC
(a) Check if DTC C1789 is output Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC C1789 is not output.
HINT: If no parts are replaced and DTC C1789 is output, there may be an internal malfunction in the suspension control ECU. In this case, replace the suspension control ECU.

NG -- REPLACE SUSPENSION CONTROL ECU
OK -- USE SIMULATION METHOD TO CHECK