2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) C CODE Page 803

B -- GO TO VEHICLE STABILITY CONTROL SYSTEM See: Diagnostic Trouble Code Descriptions/Vehicle Stability Control

System

A -- REPLACE SUSPENSION CONTROL ECU

Up to 08/2009

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

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 is installed.

INSPECTION PROCEDURE

NOTICE:

- Before performing troubleshooting, inspect the connectors of related circuits.

- If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first See:

C1782.

- Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation See: Accessories

and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Diagnostic Aids/How To Troubleshoot ECU Controlled

Systems/How To Proceed With Troubleshooting; 2) DTC inspection See: Steering and Suspension/Suspension/Testing and

Inspection/Reading and Clearing Diagnostic Trouble Codes; and 3) Techstream inspection (Data List or Active Test) See:

Steering and Suspension/Suspension/Testing and Inspection/Scan Tool Testing and Procedures. If no malfunctions are found

in other areas, replace the suspension control ECU.

- If the suspension control ECU is replaced, the vehicle height offset calibration and registration of vehicle identification

information must be performed See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic

)/Testing and Inspection/Calibration and See: Steering and Suspension/Suspension/Suspension Control ( Automatic -

Electronic )/Testing and Inspection/Registration)

PROCEDURE

1. CHECK DTC (C1781)

(a) Check for DTC C1781 See: Steering and Suspension/Suspension/Testing and Inspection/Reading and Clearing Diagnostic Trouble

Codes

Result:

B -- REPLACE SUSPENSION CONTROL ECU

A -- Continue to next step.

2. REGISTRATION OF VEHICLE IDENTIFICATION INFORMATION

(a) Perform registration of vehicle identification information See: Steering and Suspension/Suspension/Suspension Control ( Automatic -

Electronic )/Testing and Inspection/Registration

NEXT -- Continue to next step.