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Home › Lexus › 2008 › LX 570 › Repair and Diagnosis › Suspension › Suspension Control Systems › Suspension Control › Active Height Control Suspension › DTC C1794 Height Control OFF Switch Circuit (Test Mode DTC) › Inspection Procedure

Inspection Procedure

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 (See INITIALIZATION ).
  1. INSPECT INTEGRATION CONTROL AND PANEL (HEIGHT CONTROL OFF SWITCH) 
    1. Remove the integration control and panel (See REMOVAL ).
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE

      Tester Connection Switch Condition Specified Condition
      4 (N) - 6 (E) Height control OFF switch is pushed. Below 1 Ω
      Height control OFF switch is not pushed. 10 kΩ or higher

    NG: REPLACE INTEGRATION CONTROL AND PANEL  (See REMOVAL )

    Fig 1: Identifying Integration Control And Panel Connector Terminals
    G05761345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next Step 

  2. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - SWITCH AND BODY GROUND) 
    Fig 2: Identifying K30 ECU Connector And V4 Integration Control And Panel Connector
    G05761346Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K30 ECU connector.
    2. Disconnect the V4 integration control and panel connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

    STANDARD RESISTANCE

    Tester Connection Condition Specified Condition
    K30-11 (TD) - V4-4 (N) Always Below 1 Ω
    K30-11 (TD) - Body ground Always 10 kΩ or higher
    V4-6 (E) - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE SUSPENSION CONTROL ECU  (See REMOVAL )

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