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DYNAMIC REAR STEERING SYSTEM, Diagnostic DTC:C1B11, C1B12

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DTC Code DTC Name
C1B11 Short in Motor Circuit
C1B12 Open in Motor Circuit
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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 is stored. When the DRS ECU (rear steering control ECU) detects a problem with the motor terminals or ECU motor drive circuit, DTC C1B12 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C1B11 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 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
Table 1. DTC Detection Conditions: C1B11
  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnosis Condition After the power switch is turned on (IG) and before control starts ○ ○ - -
After the power switch is turned on (IG) - - ○ ○
Malfunction Status A short in the motor circuit ○ - ○ -
An internal ECU (motor drive circuit) malfunction - ○ - ○
Detection Time 1.2 seconds or more 1.2 seconds or more 0.1 seconds or more 0.1 seconds or more
Number of Trips 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.

Table 2. DTC Detection Conditions: C1B12
  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnosis Condition After the power switch is turned on (IG) and before control starts ○ ○ - -
After the power switch is turned on (IG) - - ○ ○
Malfunction Status An open in the motor circuit ○ - ○  
An internal ECU (motor drive circuit) malfunction - ○ - ○
Detection Time 1.2 seconds or more 1.2 seconds or more 0.2 seconds or more 0.2 seconds or more
Number of Trips 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.

Table 3. *a Motor *b Rear Steering Link Assembly *c DRS ECU (Rear Steering Control ECU)
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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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  • 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.

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PROCEDURE


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    INSPECT REAR STEERING LINK ASSEMBLY (MOTOR)


    1. Turn the power switch off.

    2. Disconnect the z19 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.

      Table 4. Standard Resistance
      Tester Connection Condition Specified Condition
      z19-1 (V) - z19-3 (W) Always Below 1 Ω
      z19-2 (U) - z19-1 (V) Always Below 1 Ω
      z19-3 (W) - z19-2 (U) Always Below 1 Ω
      z19-1 (V) - Body ground Always 100 kΩ or higher
      z19-2 (U) - Body ground Always 100 kΩ or higher
      z19-3 (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 ASSEMBLYClick here