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 sent 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 operate based on the voltage value.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2603 Tilt and Telescopic Manual Switch Circuit Malfunction When operating the tilt and telescopic switch, an abnormal voltage value is sent to the multiplex tilt and telescopic ECU.

  • Tilt and telescopic switch

  • Harness or connector

  • Multiplex tilt and telescopic ECU

WIRING DIAGRAM

A0021DIE16

PROCEDURE


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


    1. A0021LMC03
      *1 Tilt and Telescopic Switch
      *a Tilt Up
      *b Tilt Down
      *c Telescopic Extend (Long)
      *d Telescopic Contract (Short)

      Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Check the tilt and telescopic switch.

    6. Enter the following menus: Body Electrical / Tilt & Telescopic / Data List.


      Body Electrical > Tilt&Telescopic > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Tilt Up Switch Input state of tilt up switch ON or OFF

      ON: Tilt up switch activated

      OFF: Tilt up switch not activated

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

      ON: Tilt down switch activated

      OFF: Tilt down switch not activated

      		 -
      Telesco Short Switch Input state of telescopic contract switch ON or OFF

      ON: Telescopic contract switch activated

      OFF: Telescopic contract switch not activated

      		 -
      Telesco Long Switch Input state of telescopic extend switch ON or OFF

      ON: Telescopic extend switch activated

      OFF: Telescopic extend switch not activated

      		 -

      Body Electrical > Tilt&Telescopic > Data List
      Tester Display
      Tilt Up Switch
      Tilt Down Switch
      Telesco Short Switch
      Telesco Long Switch
      OK
      "ON" is displayed on the GTS screen when each switch is turned on.
      "OFF" is displayed on the GTS screen when each switch is turned off.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  2. CONFIRM DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Tilt&Telescopic > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Tilt&Telescopic > Trouble Codes
      Result
      Result Proceed to
      DTCs are output. A
      DTCs are 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 - TILT AND TELESCOPIC SWITCH)


    1. Disconnect the K19 multiplex tilt and telescopic ECU connector.

    2. Disconnect the K22 tilt and telescopic switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K19-5 (VC) - K22-1 (VC) Always Below 1 Ω
      K19-18 (MSW) - K22-3 (MSW) Always Below 1 Ω
      K19-5 (VC) - Body ground Always 10 kΩ or higher
      K19-18 (MSW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0020LBC01
      *a

      Component with harness connected

      (Multiplex Tilt and Telescopic ECU)

      Reconnect the K19 multiplex tilt and telescopic ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K19-5 (VC) - K19-18 (MSW) Power switch on (IG) 4.9 to 5.1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    OK

  5. CHECK TILT AND TELESCOPIC SWITCH


    1. A00237GC04
      *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 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
      Proceed to
      OK
      NG

    OK

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    NG

    REPLACE TILT AND TELESCOPIC SWITCH Click here