AIR SUSPENSION SYSTEM, Diagnostic DTC:C1791/91

DTC Code DTC Name
C1791/91 Adaptive Variable Suspension (AVS) Switch Circuit (Test Mode DTC)

DESCRIPTION

The absorber control switch is used to select the damping force mode of the shock absorber.

DTC Code DTC Detection Condition Trouble Area
C1791/91 The absorber control switch signal does not change.

  • Absorber control switch (Center cluster module switch)

  • Harness or connector

  • Suspension control ECU

Tech Tips

This DTC is stored only during test mode.

WIRING DIAGRAM

A01DQ7CE06

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (DAMPING 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
      Damping Control Switch

      Absorber control switch /

      NORMAL, COMFORT or SPORT

      		 Indicates current absorber control switch position -

    6. Check that the value displayed on the intelligent tester changes by operating the absorber control switch between COMF, NORMAL and SPORT.

      OK
      Absorber control switch value changes.

    NG

    INSPECT CENTER CLUSTER MODULE SWITCH Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. INSPECT CENTER CLUSTER MODULE SWITCH


    1. Turn the ignition switch off.

    2. Remove the absorber control switch (center cluster module switch) Click here.

    3. A01DT55E01
      Text in Illustration
      *a

      Component without harness connected

      (Absorber Control 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
      24 (E) - 9 (ECU1) SPORT position Below 1 Ω
      Normal position 10 kΩ or higher
      24 (E) - 8 (ECU2) COMF position Below 1 Ω
      Normal position 10 kΩ or higher

    NG

    REPLACE CENTER CLUSTER MODULE SWITCH Click here

    OK

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


    1. Disconnect the G156 absorber control switch (center cluster module 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
      G156-9 (ECU1) - A49-23 (TSW1) Always Below 1 Ω
      G156-8 (ECU2) - A49-22 (TSW2) Always Below 1 Ω
      G156-24 (E) - Body ground Always Below 1 Ω
      G156-9 (ECU1) or A49-23 (TSW1) - Body ground Always 10 kΩ or higher
      G156-8 (ECU2) or A49-22 (TSW2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE SUSPENSION CONTROL ECU Click here