DYNAMIC REAR STEERING SYSTEM, Diagnostic DTC:C1B26/36, C1B2A/38

DTC Code DTC Name
C1B26/36 Motor Power Supply Voltage Circuit(ECU Start-up)
C1B2A/38 Motor Power Supply Voltage Circuit

DESCRIPTION

When the DRS ECU (rear steering control ECU) detects a problem with the PIG power source circuit, DTC C1B26/36 and C1B2A/38 are stored.

DTC Code DTC Detection Condition Trouble Area
C1B26/36

All conditions are met for approximately 1.5 seconds or more:


  • The engine switch is on (IG).

  • Control has not started.

  • An open in the PIG circuit or an internal malfunction in the ECU is detected.

  • ARS fuse

  • DRS ECU (rear steering control ECU)

  • Harness or connector
C1B2A/38

All conditions are met for approximately 2.4 seconds or more:


  • The engine switch is on (IG).

  • When the PIG voltage is 18.5 V or higher or 7 V or less, an open or short in the PIG circuit, or an internal malfunction in the ECU is detected.

  • ARS fuse

  • DRS ECU (rear steering control ECU)

  • Harness or connector

WIRING DIAGRAM

A01FHOHE01

INSPECTION PROCEDURE

Note


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

  • Since DTC C15C9/76 is stored in the VGRS ECU (front steering control ECU), after performing repairs on the dynamic rear steering system, clear the DTCs for the VGRS system.

  • Before performing troubleshooting, turn off the remote service function.

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

PROCEDURE


  1. READ VALUE USING GTS (PIG POWER SUPPLY 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 / DRS / Data List.

      DRS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      PIG Power Supply Voltage

      PIG power supply voltage/

      Min.: 0.00 V

      Max.: 255.99 V

      		 11 to 14 V -
      OK
      11 to 14 V

    NG

    INSPECT REAR STEERING CONTROL ECU (PIG, GNDY TERMINAL) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. INSPECT REAR STEERING CONTROL ECU (PIG, GNDY TERMINAL)


    1. Turn the engine switch off.

    2. Check the connection condition of the DRS ECU (rear steering control ECU) connector.

    3. Disconnect the U42 DRS ECU (rear steering control ECU) connector.

    4. A01FEYDE01
      Text in Illustration
      *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
      4 (PIG) - 5 (GNDY) Always 100 kΩ or higher

    NG

    REPLACE REAR STEERING CONTROL ECU Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (PIG CIRCUIT)


    1. Turn the engine switch off.

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

    3. A01FHP0E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to DRS ECU [Rear Steering Control ECU])

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      U42-4 (PIG) - U42-5 (GNDY) Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE REAR STEERING CONTROL ECU Click here