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 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 No. Detection Condition Trouble Area
B2603 When operating the tilt and telescopic switch, an abnormal voltage value is input to the multiplex tilt and telescopic ECU.

  • Harness or connector

  • Tilt and telescopic switch

  • Headlight dimmer switch assembly*1

  • Windshield wiper switch assembly*2

  • Multiplex tilt and telescopic ECU

WIRING DIAGRAM



INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (TILT UP/DOWN SWITCH, TELESCOPIC SHORT/LONG SWITCH)


    1. A01NFBZE01

      Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the intelligent tester on.

    5. Check the tilt and telescopic manual switch. Enter the following menus: Chassis / Tilt & Telescopic / Data List.

      Tilt & Telescopic
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Telesco Short Switch

      Input state of telescopic short by manual switch/

      OFF or ON

      OFF: Telescopic short not activated by manual switch

      ON: Telescopic short activated by manual switch

      		 -
      Telesco Long Switch

      Input state of telescopic long by manual switch/

      OFF or ON

      OFF: Telescopic long not activated by manual switch

      ON: Telescopic long activated by manual switch

      		 -
      Tilt Down Switch

      Input state of tilt down by manual switch/

      OFF or ON

      OFF: Tilt down not activated by manual switch

      ON: Tilt down activated by manual switch

      		 -
      Tilt Up Switch

      Input state of tilt up by manual switch//

      OFF or ON

      OFF: Tilt up not activated by manual switch

      ON: Tilt up 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 - TILT AND TELESCOPIC SWITCH) Click here

    OK

  2. CONFIRM DTC


    1. Clear the DTC Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output. A
      DTC is output. (for LHD) B
      DTC is output. (for RHD) C

    B

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    C

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

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


    1. A01NDA4E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Multiplex Tilt and Telescopic ECU)
      *2

      Front view of wire harness connector

      (to Headlight Dimmer Switch Assembly)

      for LHD, RHD Light control switch LH side type:


      1. Disconnect the F36 multiplex tilt and telescopic ECU connector.

      2. Disconnect the F39 headlight dimmer switch assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        F36-4 (VC) - F39-8 (VC) Always Below 1 Ω
        F36-3 (MSW) - F39-10 (MSW)
        F39-8 (VC) - Body ground Always 10 kΩ or higher
        F39-10 (MSW) - Body ground
    2. A01NCQWE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Multiplex Tilt and Telescopic ECU)
      *2

      Front view of wire harness connector

      (to Windshield Wiper Switch Assembly)

      for RHD Light control switch RH side type:


      1. Disconnect the F36 multiplex tilt and telescopic ECU connector.

      2. Disconnect the F81 windshield wiper switch assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        F36-4 (VC) - F81-12 (VC) Always Below 1 Ω
        F36-3 (MSW) - F81-13 (MSW)
        F81-12 (VC) - Body ground Always 10 kΩ or higher
        F81-13 (MSW) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01NEMSE05
      Text in Illustration
      *1

      Component with harness connected

      (Multiplex Tilt and Telescopic ECU)

      Reconnect the F36 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
      F36-4 (VC) - F36-3 (MSW) Power switch on (IG) 4.9 to 5.1 V
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    C

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    A

  5. CHECK TILT AND TELESCOPIC SWITCH


    1. A01NFBYE02
      Text in Illustration
      *1

      Component without harness connected

      (Tilt and Telescopic Switch)

      Remove the tilt and telescopic 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 - 3 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
      NG A
      OK (for LHD, RHD Light control switch LH side type) B
      OK (for RHD Light control switch RH side type) C

    B

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    C

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here

    A

    REPLACE TILT AND TELESCOPIC SWITCH Click here