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

  • Headlight dimmer switch assembly

  • Multiplex tilt and telescopic ECU

WIRING DIAGRAM

A0058M8E39

PROCEDURE


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

    A0052LGE14
    *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 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) Click here

    OK

  2. CONFIRM DTC


    1. Clear the DTC 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)

    A0053GNE02
    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)

    1. Disconnect the D45 multiplex tilt and telescopic ECU connector.

    2. Disconnect the D7 headlight dimmer switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D45-4 (VC) - D7-8 (VC) Always Below 1 Ω
      D45-3 (MSW) - D7-10 (MSW)
      D7-8 (VC) - Body ground Always 10 kΩ or higher
      D7-10 (MSW) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0057YYE02
      Text in Illustration
      *1

      Component with harness connected

      (Multiplex Tilt and Telescopic ECU)

      Reconnect the D45 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
      D45-4 (VC) - D45-3 (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. A0053VAE01
      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

    OK

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    NG

    REPLACE TILT AND TELESCOPIC SWITCH Click here