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

DTC Code DTC Name
C15A1/61 Actuator Malfunction

DESCRIPTION

The steering control ECU drives the actuator while the steering wheel is turned to set the gear ratio. It detects the current flowing into the actuator motor driving circuit.

If the steering control ECU detects excessive current, it will store DTC C15A1/61, turn on the master warning light, and stop VGRS operation.

DTC Code DTC Detection Condition Trouble Area
C15A1/61 Excessive current (exceeding the estimated amount) flows due to a malfunction in the motor drive circuit.

  • Harness or connector

  • Steering actuator

  • Steering control ECU

WIRING DIAGRAM

A01X78UE04

CAUTION / NOTICE / HINT

Tech Tips

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (STEERING CONTROL ECU - STEERING ACTUATOR)

    A01X7U2E02

    1. Disconnect the E78 steering control ECU connector.

    2. Disconnect the E80 steering actuator connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E78-1 (BMV) - E78-2 (BMU) Always 10 kΩ or higher
      E78-1 (BMV) - E78-3 (BMW)
      E78-2 (BMU) - E78-3 (BMW)
      E78-1 (BMV) - E80-5 (BMV+) Always Below 1 Ω
      E78-2 (BMU) - E80-4 (BMU+)
      E78-3 (BMW) - E80-13 (BMW+)
      E78-1 (BMV) - Body ground Always 10 kΩ or higher
      E78-2 (BMU) - Body ground
      E78-3 (BMW) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK STEERING ACTUATOR


    1. A01X0W9E02
      *a Rear view of wire harness connector: (to Steering Control ECU)
      *b 2 (BMU)
      *c 1 (BMV)
      *d 3 (BMW)

      Disconnect the E78 steering control ECU connector.

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

      Tech Tips

      The resistance must be measured with the steering actuator connector connected.

      Standard Resistance
      Tester Connection Condition Specified Condition
      E78-1 (BMV) - E78-2 (BMU) Always Below 1 Ω
      E78-1 (BMV) - E78-3 (BMW)
      E78-2 (BMU) - E78-3 (BMW)
      E78-1 (BMV) - Body ground Always 10 kΩ or higher
      E78-2 (BMU) - Body ground
      E78-3 (BMW) - Body ground
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPLACE STEERING ACTUATOR ASSEMBLY Click here

    B

    REPLACE STEERING CONTROL ECU Click here

    C

    REPLACE STEERING CONTROL ECU Click here