DYNAMIC REAR STEERING SYSTEM, Diagnostic DTC:C1B11/21, C1B12/22

DTC Code DTC Name
C1B11/21 Short in Motor Circuit
C1B12/22 Open in Motor Circuit

DESCRIPTION

The DRS ECU (rear steering control ECU) detects the current flowing to the motor. When a malfunction such as an overcurrent is detected, DTC C1B11/21 is stored. When the DRS ECU (rear steering control ECU) detects a problem with the motor terminals or ECU motor drive circuit, DTC C1B12/22 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C1B11/21 Short in Motor Circuit

Either condition is met:


  • After the power switch is turned on (IG), a short in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 1.2 seconds or more before control starts.

  • After the power switch is turned on (IG), a short in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 0.1 seconds or more.

  • Rear steering link assembly

  • DRS ECU (rear steering control ECU)

 Comes on Power switch on (IG) again
C1B12/22 Open in Motor Circuit

Either condition is met:


  • After the power switch is turned on (IG), an open in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 1.2 seconds or more before control starts.

  • After the power switch is turned on (IG), an open in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 0.2 seconds or more.

  • Rear steering link assembly

  • DRS ECU (rear steering control ECU)

 Comes on Power switch on (IG) again

WIRING DIAGRAM

B000OMOE09
*a Motor
*b Rear Steering Link Assembly
*c 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

  • If the rear steering link assembly or the rear suspension is removed and installed, replaced, or adjusted, after performing actuator calibration value initialization, 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.

PROCEDURE


  1. INSPECT REAR STEERING LINK ASSEMBLY (MOTOR)


    1. Turn the power switch off.

    2. B000PIPC08
      *a

      Front view of rear steering link assembly connector

      (to DRS ECU [Rear Steering Control ECU])

      Disconnect the z25 rear steering link assembly connector from the DRS ECU (rear steering control ECU).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z25-1 (V) - z25-3 (W) Always Below 1 Ω
      z25-2 (U) - z25-1 (V) Always Below 1 Ω
      z25-3 (W) - z25-2 (U) Always Below 1 Ω
      z25-1 (V) - Body ground Always 100 kΩ or higher
      z25-2 (U) - Body ground Always 100 kΩ or higher
      z25-3 (W) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRS ECU (REAR STEERING CONTROL ECU) Click here

    NG

    REPLACE REAR STEERING LINK ASSEMBLY Click here