VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15A1/61, C15A2/62, C15A6/62

DTC Code DTC Name
C15A1/61 Short in Motor Circuit
C15A2/62 Open in Motor Circuit
C15A6/62 Actuator Motor Power Distribution Malfunction

DESCRIPTION

If the VGRS ECU (front steering control ECU) detects excessive current, it stores DTC C15A1/61, turns on the master warning light and stops VGRS operation.

If the VGRS ECU (front steering control ECU) detects excessive current flowing into the steering actuator assembly or an internal malfunction, it turns on the master warning light, stores DTC C15A2/62 and stops VGRS operation.

If the VGRS ECU (front steering control ECU) detects a malfunction in the motor drive circuit, it turns the master warning light on, stores DTC C15A6/62 and stops VGRS operation.

DTC Code DTC Detection Condition Trouble Area
C15A1/61

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 0.03 seconds or more.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector

C15A2/62

C15A6/62

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 0.03 seconds or more.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector

WIRING DIAGRAM

A000QASE07

CAUTION / NOTICE / HINT

Note


  • When replacing the VGRS ECU (front steering control ECU) or steering actuator assembly, perform actuator angle neutral position calibration and initialization after replacing parts Click here.

  • Since DTC C1B09/19 is stored in the DRS ECU (rear steering control ECU), after performing repairs on the VGRS system, clear the DTCs for the dynamic rear steering system.

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

Tech Tips

When DTC C15A2/62 is output, a short circuit inside the steering actuator assembly or inside the VGRS ECU (front steering control ECU) is suspected.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (PIG, PGND TERMINAL)


    1. A000SVSE03
      Text in Illustration
      *a

      Component with harness connected

      (VGRS ECU [Front Steering Control ECU])

      Turn the power switch off.

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

      Tech Tips

      Perform the inspection from the rear of the connector with the connector connected to the VGRS ECU (front steering control ECU).

      Standard Resistance
      Tester Connection Condition Specified Condition
      A31-1(PGND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A31-2(PIG) - A31-1(PGND) Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT STEERING ACTUATOR ASSEMBLY


    1. A000RGBE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to VGRS ECU [Front Steering Control ECU])

      Disconnect the VGRS ECU (front steering control ECU) connector.

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

      Tech Tips

      Measure the resistance of the steering actuator assembly at the connector of the VGRS ECU (front steering control ECU).

      Standard Resistance
      Tester Connection Condition Specified Condition
      N102-2 (BMV) - N102-3 (BMU) Always Below 1 Ω
      N102-2 (BMV) - N102-1 (BMW) Always Below 1 Ω
      N102-3 (BMU) - N102-1 (BMW) Always Below 1 Ω
      N102-2 (BMV) - Body ground Always 100 kΩ or higher
      N102-3 (BMU) - Body ground Always 100 kΩ or higher
      N102-1 (BMW) - Body ground Always 100 kΩ or higher
      Result
      Result Proceed to
      The resistance value deviates from the standard A
      The resistance value is within the standard B

    B

    RECONFIRM DTC Click here

    A

  3. CHECK HARNESS AND CONNECTOR (FRONT STEERING CONTROL ECU - STEERING ACTUATOR ASSEMBLY)


    1. Turn the power switch off.

    2. Disconnect the N102 VGRS ECU (front steering control ECU) connector.

    3. Disconnect the N38 steering actuator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N102-2 (BMV) - N38-5 (BMV+) Always Below 1 Ω
      N102-3 (BMU) - N38-4 (BMU+) Always Below 1 Ω
      N102-1 (BMW) - N38-13 (BMW+) Always Below 1 Ω
      N102-2 (BMV) - N102-3 (BMU) Always 100 kΩ or higher
      N102-2 (BMV) - N102-1 (BMW) Always 100 kΩ or higher
      N102-3 (BMU) - N102-1 (BMW) Always 100 kΩ or higher
      N102-2 (BMV) - Body ground Always 100 kΩ or higher
      N102-3 (BMU) - Body ground Always 100 kΩ or higher
      N102-1 (BMW) - Body ground Always 100 kΩ or higher

    OK

    REPLACE STEERING ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. RECONFIRM DTC


    1. Reconnect the N102 VGRS ECU (front steering control ECU) connector.

    2. Clear the DTCs Click here

    3. Turn the power switch on (READY).

    4. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C15A1/61 is not output A
      DTC C15A1/61 is output B

    A

    REPLACE FRONT STEERING CONTROL ECU Click here

    B

    REPLACE STEERING ACTUATOR ASSEMBLY Click here