Lexus NX manuals

Lexus NX: Suspension Control ECU Malfunction (C1781)

Lexus NX Service Manual / Suspension / Suspension Control / Adaptive Variable Suspension System / Suspension Control ECU Malfunction (C1781)

DESCRIPTION

If a malfunction in the absorber control ECU is detected, DTC C1781 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

C1781

Suspension Control ECU Malfunction

Either condition is met:

  • A nonvolatile memory write or read error occurs.
  • A CAN communication register is stuck.
  • An overheat protection function malfunction occurs.
  • Absorber control ECU
  • CAN communication system

Does not come on

CAUTION / NOTICE / HINT

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.

    Click here

  • Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation ; 2) DTC inspection ; and 3) Techstream inspection (ECU Data List or Active Test ). If no malfunctions are found in other areas, replace the absorber control ECU.
  • When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met.

    Click here

PROCEDURE

1.

CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

(a) Check for DTCs.

Click here

Chassis > Air suspension > Trouble Codes

Result

Proceed to

CAN DTC is not output

A

CAN DTC is output

B
A

REPLACE ABSORBER CONTROL ECU

B

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

READ NEXT:

 Power Source Voltage Malfunction (C1782)

DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate C1782 Power Source Voltage Malfunction While the power switch is on (IG), the voltage at ter

 Steering Angle Sensor Communication Error (C1784)

DESCRIPTION Steering sensor signals are sent to the absorber control ECU via CAN communication. When there is a communication malfunction, the malfunction will be detected by the diagnosis function.

 Vehicle Identification Malfunction (C1789)

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 i

SEE MORE:

 Radio Receiver Assembly Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Radio Receiver Assembly Communication Stop Mode Any of the following conditions are met: Communication stop for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Comm

 Installation

INSTALLATION PROCEDURE 1. INSTALL INTEGRATION CONTROL AND PANEL ASSEMBLY (VSC OFF SWITCH) (a) Install the integration control and panel assembly (VSC OFF switch) to the upper rear console panel sub-assembly with the 2 screws. HINT: The locations labeled A in the illustration are tightened togethe

© 2016-2025 Copyright www.lexunx.com