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 Code DTC Detection Condition Trouble Area
C1B11/21

Either condition is met:


  • After the engine 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 engine 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)
C1B12/22

Either condition is met:


  • After the engine 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 engine 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)

WIRING DIAGRAM

A01FIQ1E02

INSPECTION PROCEDURE

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 engine switch on (IG).

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

    3. A01FE8FE02
      Text in Illustration
      *a

      Front view of rear steering link assembly connector

      (to DRS ECU [rear steering control ECU])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z11-1 (V) - z11-3 (W) Always Below 1 Ω
      z11-2 (U) - z11-1 (V) Always Below 1 Ω
      z11-3 (W) - z11-2 (U) Always Below 1 Ω
      z11-1 (V) - Body ground Always 100 kΩ or higher
      z11-2 (U) - Body ground Always 100 kΩ or higher
      z11-3 (W) - Body ground Always 100 kΩ or higher

    NG

    REPLACE REAR STEERING LINK ASSEMBLY Click here

    OK

    REPLACE REAR STEERING CONTROL ECU Click here