ADAPTIVE VARIABLE SUSPENSION SYSTEM, Diagnostic DTC:C1782

DTC Code DTC Name
C1782 Power Source Voltage Malfunction

DESCRIPTION

This DTC (C1782) is output if voltage matching the DTC detection condition continues to be supplied to the IGB terminal of the absorber control ECU due to malfunctions in the power source or charging circuits, such as the battery or generator assembly circuits.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
C1782 Power Source Voltage Malfunction While the engine switch is on (IG), the voltage at terminal B is 10 V or less, or 16 V or more for 0.5 seconds.

  • AVS fuse

  • Battery

  • Charging system

  • Wire harness or connector

  • Absorber control ECU

 Does not come on No

WIRING DIAGRAM

B000UG2E07
*a from IG Circuit
*b Absorber Control ECU

CAUTION / NOTICE / HINT

Note


  • Before performing troubleshooting, inspect the connectors of related circuits.

  • Before replacing the absorber control ECU, perform all of the following:


    • Symptom simulation.

      Click here

    • DTC inspection.

      Click here

    • GTS inspection.

      Click here


      • If no malfunctions are found in other areas, replace the absorber control ECU.

  • After replacing the absorber control ECU with a new one, perform registration of vehicle identification information.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. READ VALUE USING GTS (IG POWER SOURCE VOLTAGE)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS 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
      IG Power Source Voltage ECU power supply voltage

      Min.: 0.0 V

      Max.: 25.5 V

      		 11 to 14 V (Actual ECU power supply voltage): engine switch on (IG) -

      Chassis > Air suspension > Data List
      Tester Display
      IG Power Source Voltage
      OK
      The value is as specified in the normal condition column.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT BATTERY Click here

    OK

  2. CHECK FOR DTCS


    1. Clear the DTCs.

      Click here


      Chassis > Air suspension > Clear DTCs

    2. Turn the engine switch off.

    3. Check for DTCs.

      Click here


      Chassis > Air suspension > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE ABSORBER CONTROL ECU Click here

  3. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    OK

  4. CHECK TERMINAL VOLTAGE (IGB TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the X39 absorber control ECU connector.

    3. B000V2JC18
      *a

      Front view of wire harness connector

      (to Absorber Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      X39-1 (IGB) - Body ground engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the X39 absorber control ECU connector.

    3. B000V2JC19
      *a

      Front view of wire harness connector

      (to absorber control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X39-4 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ABSORBER CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR