DYNAMIC REAR STEERING SYSTEM, Diagnostic DTC:C1B29

DTC Code DTC Name
C1B29 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 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C1B29 IG Power Supply Voltage Circuit

All conditions are met:


  • The engine 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 for approximately 3 seconds or more.

  • Stop and start system

  • DRS ECU (rear steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again
DTC Detection Conditions:
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition Engine switch is on (IG) ○ ○ ○ ○ ○
Malfunction Status IG voltage is 4 V or less ○ - - - -
IG voltage is 18.5 V or higher - - - ○ -
An open in the IG circuit - ○ - - -
A short in the IG circuit - - - - ○
An internal malfunction in the ECU - - ○ - -
Detection Time Approximately 3 seconds or more Approximately 3 seconds or more Approximately 3 seconds or more Approximately 3 seconds or more Approximately 3 seconds or more
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

B005S7OE02
*a from Engine Stop and Start ECU
*b IGY
*c GNDY
*d DRS ECU (Rear Steering Control ECU)

CAUTION / NOTICE / HINT

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 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.

PROCEDURE


  1. READ VALUE USING GTS (IG 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.


      Chassis > DRS > Data List
      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

      		 10.5 to 16 V -

      Chassis > DRS > Data List
      Tester Display
      IG Power Supply Voltage
      Result
      Result Proceed to
      Below 10.5 V A
      10.5 to 16 V B
      Higher than 16 V C

    B

    USE SIMULATION METHOD TO CHECK Click here

    C

    REPLACE DRS ECU (REAR STEERING CONTROL ECU) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (GNDY - BODY GROUND)


    1. Turn the engine switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P4-5 (GNDY) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (IGY - BODY GROUND)


    1. Turn the engine switch on (IG).

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

      Tech Tips

      With the connector connected to the VGRS ECU (front steering control ECU), measure the voltage from the rear of the connector.

      Standard Voltage
      Tester Connection Condition Specified Condition
      P4-9 (IGY) - Body ground Engine switch on (IG) 10.5 to 16 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRS ECU (REAR STEERING CONTROL ECU) Click here

    NG

    GO TO STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) Click here