DYNAMIC REAR STEERING SYSTEM, Diagnostic DTC:C1597

DTC Code DTC Name
C1597 Lost Communication between VGRS and DRS

DESCRIPTION

The DRS ECU (rear steering control ECU) communicates with the VGRS ECU (front steering control ECU) via the local bus.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C1597 Lost Communication between VGRS and DRS

All conditions are met:


  • 1 second or more elapses after turning the engine switch on (IG).

  • The power source voltage is 10 to 16 V.

  • The signal from the VGRS ECU is lost (local bus) for approximately 3 seconds or more.

  • VGRS ECU (front steering control ECU)

  • DRS ECU (rear steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again

WIRING DIAGRAM

B006H19E04
*1 VGRS ECU (Front Steering Control ECU)
*2 DRS ECU (Rear Steering Control ECU)

CAUTION / NOTICE / HINT

Note


  • When replacing the VGRS ECU (front steering control ECU), perform actuator angle neutral position calibration and initialization after replacement.

    Click here

  • When replacing the DRS ECU (rear steering control ECU), perform neutral position memorization and motor rotation angle sensor calibration.

    Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Chassis > DRS > Trouble Codes
      Result
      Result Proceed to
      DTC U0130 is not output A
      DTC U0130 is output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK FOR DTC (VARIABLE GEAR RATIO STEERING SYSTEM)


    1. Check for DTCs in the variable gear ratio steering system.

      Click here


      Chassis > VGRS > Trouble Codes
      Result
      Result Proceed to
      DTC U0134 is not output A
      DTC U0134 is output B

    B

    GO TO VARIABLE GEAR RATIO STEERING SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    A

  3. CHECK HARNESS AND CONNECTOR (CAN+, CAN- TERMINAL)


    1. Turn the engine switch off.

    2. Check the connection condition of the VGRS ECU (front steering control ECU) connector and terminals.

    3. Disconnect the G79 VGRS ECU (front steering control ECU) connector.

    4. B006AKNC12
      *a

      Rear view of wire harness connector

      (to VGRS ECU [Front Steering Control ECU])

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

      Tech Tips

      Measure the resistance of the wire harness and DRS ECU (rear steering control ECU) at the VGRS ECU (front steering control ECU) connector.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G79-10 (CAN+) - G79-11(CAN-) Always 100 to 140 Ω
      G79-10 (CAN+) - Body ground Always 100 kΩ or higher
      G79-11 (CAN-) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT DRS ECU (REAR STEERING CONTROL ECU) (CAN+, CAN- TERMINAL) Click here

    OK

  4. INSPECT VGRS ECU (FRONT STEERING CONTROL ECU) (CAN+, CAN- TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the G79 VGRS ECU (front steering control ECU) connector.

    3. B006APWC14
      *a

      Component without harness connected

      (VGRS ECU [Front Steering Control ECU])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G79-10 (CAN+) - G79-11(CAN-) Always 100 to 140 Ω
      G79-10 (CAN+) - Body ground Always 100 kΩ or higher
      G79-11 (CAN-) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here

    OK

  5. RECONFIRM DTC


    1. Reconnect the G79 VGRS ECU (front steering control ECU) connector.

    2. Clear the DTCs.

      Click here


      Chassis > DRS > Clear DTCs

    3. Check for DTCs.

      Click here


      Chassis > DRS > Trouble Codes
      Result
      Result Proceed to
      DTC C1597 is not output A
      DTC C1597 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here

  6. INSPECT DRS ECU (REAR STEERING CONTROL ECU) (CAN+, CAN- TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the P4 DRS ECU (rear steering control ECU) connector.

    3. B006GE9C14
      *a

      Component without harness connected

      (DRS ECU [Rear Steering Control ECU])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P4-11 (CAN+) - P4-8 (CAN-) Always 100 to 140 Ω
      P4-11 (CAN+) - Body ground Always 100 kΩ or higher
      P4-8 (CAN-) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE DRS ECU (REAR STEERING CONTROL ECU) Click here