AIR SUSPENSION SYSTEM, Diagnostic DTC:C1791

DTC Code DTC Name
C1791 Adaptive Variable Suspension(AVS) Switch Circuit

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 The absorber control switch signal does not change.

  • Absorber control switch (Suspension control switch)

  • Harness or connector

  • Suspension control ECU

  • Shift position indicator

Tech Tips

This DTC is stored only during test mode.

WIRING DIAGRAM

B001D65E02
*1 Suspension Control ECU
*2 Absorber Control Switch (Suspension Control Switch)
*3 Shift Position Indicator

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT SUSPENSION CONTROL SWITCH


    1. Remove the absorber control switch (suspension control switch) Click here.

    2. Inspect the absorber control switch (suspension control switch) Click here.

      Result
      Result Proceed to
      Absorber control switch (suspension control switch) is normal A
      Absorber control switch (suspension control switch) is abnormal B

    B

    REPLACE SUSPENSION CONTROL SWITCH Click here

    A

  2. CHECK HARNESS AND CONNECTOR (SHIFT POSITION INDICATOR - SUSPENSION CONTROL ECU)


    1. Disconnect the G303 absorber control switch (suspension 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
      G303-9 (ECU1) - A49-23 (TSW1) Always Below 1 Ω
      G303-8 (ECU2) - A49-22 (TSW2) Always Below 1 Ω
      G303-18 (E) - Body ground Always Below 1 Ω
      G303-9 (ECU1) or A49-23 (TSW1) - Body ground Always 10 kΩ or higher
      G303-8 (ECU2) or A49-22 (TSW2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SHIFT POSITION INDICATOR


    1. Disconnect the A49 suspension control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A49-22 (TSW2) - Body ground Absorber control switch (COMF) pressed and held Below 1 Ω
      Absorber control switch (COMF) released 10 kΩ or higher
      A49-23 (TSW1) - Body ground Absorber control switch (SPORT) pressed and held Below 1 Ω
      Absorber control switch (SPORT) released 10 kΩ or higher

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPLACE SHIFT POSITION INDICATOR Click here