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DYNAMIC REAR STEERING SYSTEM, Diagnostic DTC:C1B29

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DTC Code DTC Name
C1B29 IG Power Supply Voltage Circuit
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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 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 for approximately 3 seconds or more.

  • LUG-IG1 NO.2 fuse

  • DRS ECU (rear steering control ECU)

  • Harness or connector

 Comes on Power switch on (IG) again
Table 1. DTC Detection Conditions:
  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition Power 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
Tip:

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

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

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  • 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.

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

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PROCEDURE


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    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.


      1. 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

        		 11 to 14 V -



      1. Chassis > DRS > Data List
        Tester Display
        IG Power Supply Voltage




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

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    CHECK HARNESS AND CONNECTOR (IG CIRCUIT)


    1. Turn the power switch off.

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

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

      Table 2. Standard Voltage:
      Tester Connection Condition Specified Condition
      P4-9 (IGY) - P4-5 (GNDY) Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE DRS ECU (REAR STEERING CONTROL ECU)Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR