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

  • Multiplex tilt and telescopic ECU

  • Harness or connector

WIRING DIAGRAM

A000Y2CE04
A000WJLE02

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (TILT AND TELESCOPIC MANUAL SWITCH)


    1. A000UMYE13
      *1 Tilt Up
      *2 Telescopic Extend (Long)
      *3 Telescopic Contract (Short)
      *4 Tilt Down

      Connect the intelligent tester to the DLC3.

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

    3. Use the Data List to check if the tilt and telescopic manual switch is functioning properly.

      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)

    A000XL5E03
    *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 multiplex tilt and telescopic ECU connector.

    2. Disconnect the L25 windshield wiper switch connector.

    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)
      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 power 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 Switch 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 Switch 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 Switch 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 Switch 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

      for Headlight Dimmer Switch LH Side Type:

      "ON" is not displayed on the tester screen when each switch is turned on.

      "OFF" is not displayed on the tester screen when each switch is turned off.

      		 A

      for Headlight Dimmer Switch RH Side Type:

      "ON" is not displayed on the tester screen when each switch is turned on.

      "OFF" is not displayed on the tester screen when each switch is turned off.

      		 B

      "ON" is displayed on the tester screen when each switch is turned on.

      "OFF" is displayed on the tester screen when each switch is turned off.

      		 C

    B

    REPLACE TILT AND TELESCOPIC MANUAL SWITCH Click here

    C

    REPLACE WINDSHIELD WIPER SWITCH (COMBINATION SWITCH ECU) Click here

    A

  4. INSPECT TILT AND TELESCOPIC MANUAL SWITCH


    1. Remove the tilt and telescopic manual switch Click here.

    2. Disconnect the tilt and telescopic manual switch connector.

    3. A000TCRE12
      *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