ACTIVE HEIGHT CONTROL SUSPENSION, Diagnostic DTC:C1794

DTC Code DTC Name
C1794 Height Control OFF Switch Circuit (Test Mode DTC)

DESCRIPTION

This is the height control system main switch. When the height control switch is pushed, the height control OFF indicator light lights up and height control turns off.

The off condition of the height control will not be canceled until the height control switch is pushed again or the vehicle is driven.

DTC Code Detection Condition Trouble Area
C1794 The test mode procedure is performed.

  • Harness or connector

  • Suspension control switch (Height control OFF switch)

  • Suspension control ECU

WIRING DIAGRAM

A01X5YNE08
*1 Height Control OFF Switch
*2 Suspension Control ECU

CAUTION / NOTICE / HINT

Note


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

  • If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Click here.

PROCEDURE


  1. INSPECT SUSPENSION CONTROL SWITCH (HEIGHT CONTROL OFF SWITCH)


    1. Remove the suspension control switch Click here.

    2. A01X6PRE03
      *1 Component without harness connected: (Suspension Control Switch)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      9 (N) - 16 (E) Height control OFF switch is pushed. Below 1 Ω
      Height control OFF switch is not pushed. 10 kΩ or higher

    NG

    REPLACE SUSPENSION CONTROL SWITCH Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - SWITCH AND BODY GROUND)

    A01X5EPE02
    *1 Rear view of wire harness connector: (to Suspension Control ECU)
    *2 Front view of wire harness connector: (to Suspension Control Switch)

    1. Disconnect the K34 ECU connector.

    2. Disconnect the V4 switch connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K34-11 (TD) - V4-9 (N) Always Below 1 Ω
      K34-11 (TD) - Body ground Always 10 kΩ or higher
      V4-16 (E) - Body ground Always Below 1 Ω

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR