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 manual switch. The multiplex tilt and telescopic ECU then judges which motor and in which direction that the motor should rotate based on the voltage value.

DTC Code Detection Item Trouble Area
B2603 Abnormal voltage value, which is not within the specification, is input to the multiplex tilt and telescopic ECU when the manual switch is operated.

  • Tilt and telescopic manual switch

  • Combination switch ECU

  • Multiplex tilt and telescopic ECU

  • CAN communication system

WIRING DIAGRAM

A001ARFE08
A001D82E03

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. A001AAME01
      *1 Tilt Up
      *2 Telescopic Extend (Long)
      *3 Telescopic Contract (Short)
      *4 Tilt Down

      Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester on.

    3. Select "T&T Manual SW" from the Data List.

    4. Read voltages on the tester screen when operating the tilt and telescopic manual switch.

      Tilt & Telescopic:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Tilt Up SW (CAN) Input state of tilt up by manual switch / ON or OFF

      ON: Tilt up is activated by manual switch

      OFF: Tilt up is not activated by manual switch

      		 -
      Tilt Down SW (CAN) Input state of tilt down by manual switch / ON or OFF

      ON: Tilt down is activated by manual switch

      OFF: Tilt down is not activated by manual switch

      		 -
      Telesco Short SW (CAN) Input state of telescopic short by manual switch / ON or OFF

      ON: Telescopic short is activated by manual switch

      OFF: Telescopic short is not activated by manual switch

      		 -
      Telesco Long SW (CAN) Input state of telescopic long by manual switch / ON or OFF

      ON: Telescopic long is activated by manual switch

      OFF: Telescopic long is not activated by manual switch

      		 -
      Result
      Result Proceed to
      Switch conditions in all directions are within the standard. A
      Switch conditions in certain or all directions are outside the standard. B

    B

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

    A

  2. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - WINDSHIELD WIPER SWITCH)

    A001962E01
    *1 Rear view of wire harness connector: (to Multiplex Tilt and Telescopic ECU)
    *2 Front view of wire harness connector: (to Windshield Wiper Switch)

    1. Disconnect the L34 connector from the multiplex tilt and telescopic ECU.

    2. Disconnect the L25 connector from the windshield wiper switch.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L34-14 (CANN) - L25-6 (CANN) Always Below 1 Ω
      L34-5 (CANP) - L25-5 (CANP) Always Below 1 Ω
      L34-14 (CANN) or L34-5 (CANP)- Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. READ VALUE USING INTELLIGENT TESTER (COMBINATION SWITCH ECU)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester on.

    3. Select "Combination Switch".

    4. Select the following items from the Data List.

    5. Check the tilt and telescopic manual switch.

      Combination Switch:
      Tester Display Measurement Item/Range Normal Condition Normal Condition
      Telesco Short SW Telescopic SHORT switch status/OFF or ON

      OFF: Telescopic short is not activated by manual switch

      ON: Telescopic short is activated by manual switch

      		 -
      Telesco Long SW Telescopic LONG switch status/OFF or ON

      OFF: Telescopic long is not activated by manual switch

      ON: Telescopic long is activated by manual switch

      		 -
      Tilt Down SW Tilt DOWN switch status/OFF or ON

      OFF: Tilt down is not activated by manual switch

      ON: Tilt down is activated by manual switch

      		 -
      Tilt Up SW Tilt UP switch status/OFF or ON

      OFF: Tilt up is not activated by manual switch

      ON: Tilt up is activated by manual switch

      		 -
      Result
      Result Proceed to
      OK A
      NG: LHD B
      NG: RHD C

    A

    REPLACE WINDSHIELD WIPER SWITCH (COMBINATION SWITCH ECU) Click here

    C

    REPLACE TILT AND TELESCOPIC MANUAL SWITCH Click here

    B

  4. INSPECT TILT AND TELESCOPIC MANUAL SWITCH


    1. Remove the tilt and telescopic manual switch.

    2. Disconnect the tilt and telescopic manual switch connector.

    3. A001D5IE11
      *1 Front view of wire harness connector: (to Headlight Dimmer Switch)

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

      Standard resistance
      Tester Connection Switch 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

    OK

    REPLACE HEADLIGHT DIMMER SWITCH Click here

    NG

    REPLACE TILT AND TELESCOPIC MANUAL SWITCH Click here