DTC C1789/89: Vehicle Identification Malfunction: Procedure

1. Perform registration. Refer to REGISTRATION .

NEXT: Go to next step 

1. Clear DTC. Refer to DTC CHECK / CLEAR .
2. Check if DTC C1789/89 is output. Refer to DTC CHECK / CLEAR .

   OK

   DTC C1789/89 is not output.

NG → See step   3 

OK → END 

1. Check that the part number of the installed ECM is correct. Refer to REMOVAL .
   NOTE:

   When removing the ECM to check the part number, or when replacing the ECM, be sure to follow the appropriate procedures and precautions.

   OK

   ECM with correct part number is installed.

NG → See step   6 

OK: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Check if DTC C1789/89 is output. Refer to DTC CHECK / CLEAR .

   OK

   DTC C1789/89 is not output.

   HINT: 

   If no parts are replaced and DTC C1789/89 is output, there may be an internal malfunction in the suspension control ECU. In this case, replace the suspension control ECU.

NG → See step   8 

OK → See step   7