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DTC B2603: Tilt and Telescopic Manual Switch Circuit Malfunction [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING TECHSTREAM (TILT UP/DOWN SWITCH, TELESCOPIC SHORT/LONG SWITCH) 
    1. Turn the power switch off.
      GTY415181Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Check the tilt and telescopic switch.
    6. Enter the following menus: Body Electrical / Tilt & Telescopic / Data List.
      TILT & TELESCOPIC

      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      		 -

      OK

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

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

      TEXT IN ILLUSTRATION

      *a Tilt Up
      *b Tilt Down
      *c Telescopic Extend (Long)
      *d Telescopic Contract (Short)

    NG → See step   3 

    OK: Go to next step 

  2. CONFIRM DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
    2. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
      RESULT

      Result Proceed to
      DTCs are output. A
      DTCs are not output. B

    B → See step   6 

    A → See step   7 

  3. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - TILT AND TELESCOPIC SWITCH) 
    1. Disconnect the H12 multiplex tilt and telescopic ECU connector.
    2. Disconnect the H20 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
      H12-5 (VC) - H20-1 (VC) Always Below 1 Ω
      H12-18 (MSW) - H20-3 (MSW)
      H12-5 (VC) - Body ground 10 kΩ or higher
      H12-18 (MSW) - Body ground

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK MULTIPLEX TILT AND TELESCOPIC ECU (VC TERMINAL VOLTAGE) 
    1. Reconnect the H12 multiplex tilt and telescopic ECU connector.
      GTY411983Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H12-5 (VC) - H12-18 (MSW) Power switch on (IG) 4.9 to 5.1 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Multiplex Tilt and Telescopic ECU)

    NG → See step   7 

    OK: Go to next step 

  5. CHECK TILT AND TELESCOPIC SWITCH 
    1. Remove the tilt and telescopic switch. Refer to REMOVAL [08/2013 - ] .
      GTY415272Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Tilt and Telescopic Switch)

    NG → See step   8 

    OK → See step   7 

  6. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2013 - ] 
  7. REPLACE MULTIPLEX TILT AND TELESCOPIC ECU. Refer to  REMOVAL [08/2013 - ] 
  8. REPLACE TILT AND TELESCOPIC SWITCH. Refer to  REMOVAL [08/2013 - ] 
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