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 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 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

C175603E26

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.

      Body Electrical > Tilt&Telescopic > Data List

      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.

      Result

      Result

      OK

      NG
    NG

    CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - HEADLIGHT DIMMER 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

      Result

      Result

      Proceed to

      DTC is output

      A

      DTC is not output

      B

      Body Electrical > Tilt&Telescopic > Trouble Codes

    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)

    1. Disconnect the G33 multiplex tilt and telescopic ECU connector.

    2. Disconnect the G31 headlight dimmer switch connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G33-4 (VC) - G31-8 (VC)

      Always

      Below 1 Ω

      G33-3 (MSW) - G31-10 (MSW)

      G31-8 (VC) - Body ground

      Always

      10 kΩ or higher

      G31-10 (MSW) - Body ground

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. C197975C01

      *a

      Component with harness connected

      (Multiplex Tilt and Telescopic ECU)

      Reconnect the G33 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

      G33-4 (VC) - G33-3 (MSW)

      Engine switch on (IG)

      4.9 to 5.1 V

      Result

      Result

      OK

      NG
    NG

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU

    Click here

    OK

  5. CHECK TILT AND TELESCOPIC SWITCH

    1. C197976C01

      *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

      OK

      NG
    OK

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY

    Click here

    NG

    REPLACE TILT AND TELESCOPIC SWITCH

    Click here