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 Code 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

  • Tilt and telescopic switch circuit

  • Multiplex tilt and telescopic ECU

WIRING DIAGRAM

A01XL5TE37
A01XL5TE38

PROCEDURE


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


    1. Use the Data List to check if the tilt and telescopic 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 for each switch that is turned on.
      "OFF" is displayed on the intelligent tester screen for each switch that is turned off.

    NG

    CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - HEADLIGHT DIMMER SWITCH OR WINDSHIELD WIPER 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 OR WINDSHIELD WIPER SWITCH)


    1. Disconnect the G116 multiplex tilt and telescopic ECU connector.

    2. Disconnect the G44 headlight dimmer switch or G120 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
      G116-4 (VC) - G44-8 (VC) Always Below 1 Ω
      G116-3 (MSW) - G44-10 (MSW)
      G44-8 (VC) - Body ground Always 10 kΩ or higher
      G44-10 (MSW) - Body ground
      for Headlight Dimmer Switch RH Side Type
      Tester Connection Condition Specified Condition
      G116-4 (VC) - G120-12 (VC) Always Below 1 Ω
      G116-3 (MSW) - G120-13 (MSW)
      G120-12 (VC) - Body ground Always 10 kΩ or higher
      G120-13 (MSW) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01XJE2E01
      Text in Illustration
      *a

      Component with harness connected

      (Multiplex Tilt and Telescopic ECU)

      Reconnect the G116 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
      G116-4 (VC) - G116-3 (MSW) Engine switch on (IG) 4.9 to 5.1 V

    NG

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    OK

  5. CHECK TILT AND TELESCOPIC SWITCH


    1. A01XKT4E03
      Text in Illustration
      *a

      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 Headlight Dimmer Switch LH Side Type B
      for Headlight Dimmer Switch RH Side Type C

    A

    REPLACE TILT AND TELESCOPIC SWITCH Click here

    B

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    C

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here