POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM, Diagnostic DTC:B2603

DTC Code DTC Name
B2603 Tilt and Telescopic Manual Switch Circuit Malfunction

DESCRIPTION

Different voltage values are input to the multiplex tilt and telescopic ECU by operating the tilt and telescopic manual switch. The multiplex tilt and telescopic ECU then judges which motor and in which direction that motor should be moved based on the voltage value.

DTC Code Detection Condition Trouble Area
B2603 When operating the tilt and telescopic manual switch, an abnormal voltage value is input to the multiplex tilt and telescopic ECU.

  • Tilt and telescopic manual switch

  • Tilt and telescopic manual switch circuit

  • Multiplex tilt and telescopic ECU

WIRING DIAGRAM

A01WYYIE35
A01WYYIE36

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (TILT AND TELESCOPIC MANUAL SWITCH)

    A01X6LNE11
    *1 Tilt Up
    *2 Telescopic Extend (Long)
    *3 Telescopic Contract (Short)
    *4 Tilt Down

    1. Use the Data List to check if the tilt and telescopic manual switch is functioning properly.

      Tilt & Telescopic
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Tilt Up Switch Input state of tilt up by manual switch/ON or OFF

      ON: Tilt up activated by manual switch

      OFF: Tilt up not activated by manual switch

      		 -
      Tilt Down Switch Input state of tilt down by manual switch/ON or OFF

      ON: Tilt down activated by manual switch

      OFF: Tilt down not activated by manual switch

      		 -
      Telesco Short Switch Input state of telescopic short by manual switch/ON or OFF

      ON: Telescopic short activated by manual switch

      OFF: Telescopic short not activated by manual switch

      		 -
      Telesco Long Switch Input state of telescopic long by manual switch/ON or OFF

      ON: Telescopic long activated by manual switch

      OFF: Telescopic long not activated by manual switch

      		 -
      OK
      "ON" is displayed on the intelligent tester screen when each switch is turned on.
      "OFF" is displayed on the intelligent tester screen when each switch is turned off.

    NG

    CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - HEADLIGHT DIMMER SWITCH) Click here

    OK

  2. CONFIRM DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    A

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    B

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - HEADLIGHT DIMMER SWITCH)

    A01X51RE02

    1. Disconnect the E27 multiplex tilt and telescopic ECU connector.

    2. Disconnect the E14 headlight dimmer switch or E15 windshield wiper switch connector.

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

      Standard Resistance
      for Headlight Dimmer Switch LH Side Type
      Tester Connection Condition Specified Condition
      E27-4 (VC) - E14-8 (VC) Always Below 1 Ω
      E27-3 (MSW) - E14-10 (MSW)
      E14-8 (VC) - Body ground Always 10 kΩ or higher
      E14-10 (MSW) - Body ground
      for Headlight Dimmer Switch RH Side Type
      Tester Connection Condition Specified Condition
      E27-4 (VC) - E15-6 (VC) Always Below 1 Ω
      E27-3 (MSW) - E15-7 (MSW)
      E15-6 (VC) - Body ground Always 10 kΩ or higher
      E15-7 (MSW) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK MULTIPLEX TILT AND TELESCOPIC ECU (VC TERMINAL VOLTAGE)


    1. A01X8HQE01
      *a Component with harness connected: (Multiplex Tilt and Telescopic ECU)

      Reconnect the E27 multiplex tilt and telescopic ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E27-4 (VC) - E27-3 (MSW) Engine switch on (IG) 4.9 to 5.1 V

    NG

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    OK

  5. INSPECT TILT AND TELESCOPIC MANUAL SWITCH


    1. A01XAULE06
      *1 Component without harness connected: (Tilt and Telescopic Manual Switch)

      Remove the tilt and telescopic manual switch Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 (VC) - 3 (MSW) Tilt up 342 to 378 Ω
      Tilt down 1890.5 to 2089.5 Ω
      Telescopic contract 750.5 to 829.5 Ω
      Telescopic extend 152 to 168 Ω
      Result
      Result Proceed to
      OK (for headlight dimmer switch LH side) A
      OK (for headlight dimmer switch RH side) B
      NG C

    A

    REPLACE HEADLIGHT DIMMER SWITCH Click here

    B

    REPLACE WINDSHIELD WIPER SWITCH Click here

    C

    REPLACE TILT AND TELESCOPIC MANUAL SWITCH Click here