AIR SUSPENSION SYSTEM, Diagnostic DTC:C1794/94

DTC Code DTC Name
C1794/94 Height Control OFF Switch Circuit (Test Mode DTC)

DESCRIPTION

If the height control OFF switch is pressed when the vehicle is stopped with the engine running or the ignition switch ON, vehicle height control is disabled and remains disabled even after the ignition switch is turned off. Pressing the height control OFF switch again with the engine running or the ignition switch ON resumes vehicle height control. If the vehicle speed reaches approximately 30 km/h (19 mph) when vehicle height control is disabled, vehicle height control automatically resumes.

DTC Code DTC Detection Condition Trouble Area
C1794/94 Stored only during test mode.

  • Height control OFF switch (Center cluster module switch)

  • Harness or connector

  • Suspension control ECU

WIRING DIAGRAM

A01DSUSE04

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT CENTER CLUSTER MODULE SWITCH


    1. Remove the height control OFF switch (center cluster module switch) Click here.

    2. A01DT55E03
      Text in Illustration
      *a

      Component without harness connected

      (Height Control OFF Switch (Center Cluster Module Switch))

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      5 (N) - 24 (E) Height control OFF switch pressed Below 1 Ω
      Height control OFF switch not pressed 10 kΩ or higher

    NG

    REPLACE CENTER CLUSTER MODULE SWITCH Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - CENTER CLUSTER MODULE SWITCH)


    1. Disconnect the A49 suspension control ECU connector.

    2. Disconnect the G156 height control OFF switch (center cluster module switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A49-13 (TD) - G156-5 (N) Always Below 1 Ω
      A49-13 (TD) or G156-5 (N) - Body ground Always 10 kΩ or higher
      G156-24 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE SUSPENSION CONTROL ECU Click here