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 No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

C1792/92

Height Control Switch Circuit (Test Mode DTC)

The height control switch signal does not change.

  • Height control switch (combination switch)

  • Harness or connector

  • Suspension control ECU

-
Tip:

This DTC is stored only during test mode.

WIRING DIAGRAM

C218601E03

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

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

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

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

      Chassis > Air suspension > Data List

      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.

      Result

      Result

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

  2. INSPECT HEIGHT CONTROL SWITCH (COMBINATION SWITCH)

    1. Turn the engine switch off.

    2. Remove the combination switch.

      Click here

    3. C220877C02

      *a

      Component without harness connected

      (Height Control Switch [Combination Switch])

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      14 (LO) - 9 (E)

      "Down" pressed

      Below 1 Ω

      14 (LO) - 9 (E)

      "Up" pressed

      10 kΩ or higher

      7 (HI) - 9 (E)

      "Down" pressed

      10 kΩ or higher

      7 (HI) - 9 (E)

      "Up" pressed

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE COMBINATION SWITCH ASSEMBLY

    Click here

    OK

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

    1. Disconnect the i5 combination switch connector.

    2. Disconnect the A40 suspension control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      i5-7 (HI) - A40-15 (UPSW)

      Always

      Below 1 Ω

      i5-14 (LO) - A40-14 (DNSW)

      Always

      Below 1 Ω

      i5-9 (E) - Body ground

      Always

      Below 1 Ω

      i5-7 (HI) - Body ground

      Always

      10 kΩ or higher

      i5-14 (LO) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE SUSPENSION CONTROL ECU

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR