DYNAMIC REAR STEERING SYSTEM, Diagnostic DTC:C1B29/37

DTC Code DTC Name
C1B29/37 IG Power Supply Voltage Circuit

DESCRIPTION

When the DRS ECU (rear steering control ECU) detects a problem with the IG power source circuit, DTC C1B29/39 is stored.

DTC Code DTC Detection Condition Trouble Area
C1B29/37

All conditions are met for approximately 3 seconds or more:


  • The power switch is on (IG).

  • When the IG voltage is 4 V or less or 18.5 V or higher, an open or short in the IG circuit or an internal malfunction in the ECU is detected

  • RH ECU-IG fuse

  • DRS ECU (rear steering control ECU)

  • Harness or connector

WIRING DIAGRAM

A01FRUKE02

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 C1597/57 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.

  • When this troubleshooting procedure is performed, DTCs indicating a CAN communication malfunction with the DRS ECU (rear steering control ECU) are stored in other ECUs. Therefore, after performing repairs on the dynamic rear steering system, clear DTCs.

  • 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 (IG POWER SUPPLY VOLTAGE)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power 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
      IG Power Supply Voltage

      IG power supply voltage/

      Min.: 0.00 V

      Max.: 255.99 V

      		 11 to 14 V -
      Result
      Result Proceed to
      Below 11 V A
      11 to 14 V B
      Higher than 14 V C

    B

    USE SIMULATION METHOD TO CHECK Click here

    C

    REPLACE REAR STEERING CONTROL ECU Click here

    A

  2. CHECK HARNESS AND CONNECTOR (IG CIRCUIT)


    1. Turn the power switch off.

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

    3. Turn the power switch on (IG).

    4. A01FRWQE03
      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 Switch Condition Specified Condition
      U42-9 (IGY) - U42-5 (GNDY) Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE REAR STEERING CONTROL ECU Click here