DYNAMIC REAR STEERING SYSTEM, Diagnostic DTC:C1B26, C1B2A

DTC Code DTC Name
C1B26 Motor Power Supply Voltage Circuit(ECU Start-up)
C1B2A 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 and C1B2A are stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C1B26 Motor Power Supply Voltage Circuit(ECU Start-up)

All conditions are met:


  • The engine switch is on (IG).

  • Control has not started.

  • The power source voltage is 10 V or higher.

  • An open in the PIG circuit or an internal malfunction in the ECU is detected for approximately 1.5 seconds or more.

  • ARS fuse

  • DRS ECU (rear steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again
C1B2A Motor Power Supply Voltage Circuit

All conditions are met:


  • 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 for approximately 2.4 seconds or more.

  • ARS fuse

  • DRS ECU (rear steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again
DTC Detection Conditions: C1B26
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Engine switch is on (IG) ○ ○
Control has not started
The power source voltage is 10 V or higher
Malfunction Status An open in the PIG circuit ○ -
An internal ECU malfunction - ○
Detection Time Approximately 1.5 seconds or more Approximately 1.5 seconds or more
Number of Trips 1 trip 1 trip

Tech Tips

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

DTC Detection Conditions: C1B2A
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition Engine switch is on (IG) ○ ○ ○ ○ ○
Malfunction Status PIG voltage is 7 V or less ○ - - - -
PIG voltage is 18.5 V or higher - - - ○ -
A short in the PIG circuit - ○ - - -
An open in the PIG circuit - - - - ○
An internal ECU malfunction - - ○ - -
Detection Time Approximately 2.4 seconds or more Approximately 2.4 seconds or more Approximately 2.4 seconds or more Approximately 2.4 seconds or more Approximately 2.4 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

B0069NAE18
*a from Battery
*b ARS
*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

  • 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.


      Chassis > DRS > Data List
      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 -

      Chassis > DRS > Data List
      Tester Display
      PIG Power Supply Voltage
      OK
      11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. INSPECT DRS ECU (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. B006AW6C16
      *a

      Component without harness connected

      (DRS ECU [Rear Steering Control ECU])

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P4-4 (PIG) - P4-5 (GNDY) Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DRS ECU (REAR STEERING CONTROL ECU) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (PIG CIRCUIT)


    1. Turn the engine 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.

      Standard Voltage:
      Tester Connection Condition Specified Condition
      P4-4 (PIG) - P4-5 (GNDY) Always 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