AIR SUSPENSION SYSTEM, Diagnostic DTC:C1792/92

DTC Code DTC Name
C1792/92 Height Control Switch Circuit (Test Mode DTC)

DESCRIPTION

The vehicle height can be adjusted by pressing the height control switch.

By pressing the "up" side, vehicle height is raised.

By pressing the "down" side, vehicle height is lowered.

DTC Code DTC Detection Condition Trouble Area
C1792/92 The height control switch signal does not change.

  • Height control switch

  • Harness or connector

  • Suspension control ECU

Tech Tips

This DTC is stored only during test mode.

WIRING DIAGRAM

A00O6Y7E01

INSPECTION PROCEDURE

Note

When replacing the suspension control ECU, perform registration Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (HEIGHT CONTROL SWITCH)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / Air suspension / Data List.

      Air Suspension
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Height Control Switch (UP) Height control switch ("up" side) / ON or OFF

      ON: Switch is pressed and held

      OFF: Switch is not pressed

      		 -
      Height Control Switch (DOWN) Height control switch ("down" side) / ON or OFF

      ON: Switch is pressed and held

      OFF: Switch is not pressed

      		 -

    6. Check that the value displayed on the intelligent tester changes by pressing the height control switch "up" side or "down" side.

      OK
      Height control switch value changes.

    NG

    INSPECT HEIGHT CONTROL SWITCH Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. INSPECT HEIGHT CONTROL SWITCH


    1. Turn the ignition switch off.

    2. Remove the height control switch Click here.

    3. A00OBJ0E02
      Text in Illustration
      *a

      Component without harness connected

      (Height Control Switch)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (LO) - 4 (E) "Down" pressed Below 1 Ω
      2 (LO) - 4 (E) "Up" pressed 10 kΩ or higher
      3 (HI) - 4 (E) "Down" pressed 10 kΩ or higher
      3 (HI) - 4 (E) "Up" pressed Below 1 Ω

    NG

    REPLACE HEIGHT CONTROL SWITCH Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SWITCH - SUSPENSION CONTROL ECU)


    1. Disconnect the G113 height control switch connector.

    2. Disconnect the A49 suspension control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G113-3 (HI) - A49-15 (UPSW) Always Below 1 Ω
      G113-2 (LO) - A49-14 (DNSW) Always Below 1 Ω
      G113-4 (E) - Body ground Always Below 1 Ω
      G113-3 (HI) - Body ground Always 10 kΩ or higher
      G113-2 (LO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE SUSPENSION CONTROL ECU Click here