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

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

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WIRING DIAGRAM



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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

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


    1. A01NL3TE01

      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.

      Table 1. 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.

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    CONFIRM DTC


    1. Clear the DTC (Click here).

    2. Check for DTCs (Click here).

      Table 2. Result
      Result Proceed to
      DTC is not output. A
      DTC is output. (for LHD) B
      DTC is output. (for RHD) C

  3. Click here

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


    1. A01NLU6E02

      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
        Table 3. 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)
    2. A01NJJ4E01

      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
        Table 4. 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)

  4. Click here

    CHECK MULTIPLEX TILT AND TELESCOPIC ECU (VC TERMINAL VOLTAGE)


    1. A01NI4YE05

      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
      Table 5. Text in Illustration
      *1

      Component with harness connected

      (Multiplex Tilt and Telescopic ECU)
      Table 6. Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

  5. Click here

    CHECK TILT AND TELESCOPIC SWITCH


    1. A01NMZWE02

      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
      Table 7. 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
      Table 8. Text in Illustration
      *1

      Component without harness connected

      (Tilt and Telescopic Switch)

  6. Click here

    USE SIMULATION METHOD TO CHECKClick here

  7. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECUClick here

  9. Click here

    REPLACE TILT AND TELESCOPIC SWITCHClick here

  10. Click here

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLYClick here

  11. Click here

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLYClick here

  12. Click here

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECUClick here