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.

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

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

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C15A1/61 Short in Motor Circuit

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 0.03 seconds or more.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again
C15A2/62 Open in Motor Circuit

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 0.03 seconds or more.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again
C15A6/62 Actuator Motor Power Distribution Malfunction

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 0.03 seconds or more.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again

WIRING DIAGRAM

A01FBC9E06

CAUTION / NOTICE / HINT

Note


  • When replacing the VGRS ECU (front steering control ECU) or steering actuator assembly, perform actuator angle neutral point 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.

    Click here

  • 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. B0074C6C26
      *a

      Component with harness connected

      (VGRS ECU [Front Steering Control ECU])

      Turn the engine 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
      A56-1(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
      A56-2(PIG) - A56-1(PGND) Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT STEERING ACTUATOR ASSEMBLY


    1. A01F9Z8C07
      *a

      Front view of wire harness connector

      (to VGRS ECU [Front Steering Control ECU])

      Disconnect the O15 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
      O15-2 (BMV) - O15-3 (BMU) Always Below 1 Ω
      O15-2 (BMV) - O15-1 (BMW) Always Below 1 Ω
      O15-3 (BMU) - O15-1 (BMW) Always Below 1 Ω
      O15-1 (BMW) - Body ground Always 100 kΩ or higher
      O15-2 (BMV) - Body ground Always 100 kΩ or higher
      O15-3 (BMU) - 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 (VGRS ECU (FRONT STEERING CONTROL ECU) - STEERING ACTUATOR ASSEMBLY)


    1. Turn the engine switch off.

    2. Disconnect the O15 VGRS ECU (front steering control ECU) connector.

    3. Disconnect the O14 steering actuator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O15-2 (BMV) - O14-5 (BMV+) Always Below 1 Ω
      O15-3 (BMU) - O14-4 (BMU+) Always Below 1 Ω
      O15-1 (BMW) - O14-13 (BMW+) Always Below 1 Ω
      O15-2 (BMV) - O15-3 (BMU) Always 100 kΩ or higher
      O15-2 (BMV) - O15-1 (BMW) Always 100 kΩ or higher
      O15-3 (BMU) - O15-1 (BMW) Always 100 kΩ or higher
      O15-2 (BMV) or O14-5 (BMV+) - Body ground Always 100 kΩ or higher
      O15-3 (BMU) or O14-4 (BMU+) - Body ground Always 100 kΩ or higher
      O15-1 (BMW) or O14-13 (BMW+) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEERING ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. RECONFIRM DTC


    1. Reconnect the K16 VGRS ECU (front steering control ECU) connector.

    2. Clear the DTCs.

      Click here


      Chassis > VGRS > Clear DTCs

    3. Start the engine.

    4. Check for DTCs.

      Click here


      Chassis > VGRS > Trouble Codes
      Result
      Result Proceed to
      DTCs C15A1/61, C15A2/62 and C15A6/62 is not output A
      DTCs C15A1/61, C15A2/62 and C15A6/62 is output B

    A

    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) - LHD REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here
    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) - RHD REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here

    B

    REPLACE STEERING ACTUATOR ASSEMBLY Click here