DTC    B2603    Tilt and Telescopic Manual Switch Circuit Malfunction

for Preparation Click here


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 Condition
Trouble Area
B2603
When operating the tilt and telescopic switch, an abnormal voltage value is sent to the multiplex tilt and telescopic ECU.
  1. Tilt and telescopic switch
  2. Harness or connector
  3. Multiplex tilt and telescopic ECU

WIRING DIAGRAM


C240527E02


INSPECTION PROCEDURE

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


    C113518E03

  1. Turn the engine switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the intelligent tester on.

  1. Check the tilt and telescopic manual switch. Enter the following menus: Body / Tilt & Telescopic / Data List.

    Tilt & Telescopic 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Telesco Short Switch
    		Input state of telescopic contract switch/
    OFF or ON
    		OFF: Telescopic contract switch not activated
    ON: Telescopic contract switch activated
    		-
    Telesco Long Switch
    		Input state of telescopic extend switch/
    OFF or ON
    		OFF: Telescopic extend switch not activated
    ON: Telescopic extend switch activated
    		-
    Tilt Down Switch
    		Input state of tilt down switch/
    OFF or ON
    		OFF: Tilt down switch not activated
    ON: Tilt down switch activated
    		-
    Tilt Up Switch
    		Input state of tilt up switch/
    OFF or ON
    		OFF: Tilt up switch not activated
    ON: Tilt up switch activated
    		-

    OK:
    "ON" is displayed on the intelligent tester screen when each switch is turned on.
    "OFF" is displayed on the intelligent tester 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
Go to step 3
OK


2.CONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    Result 
    Result
    		Proceed to
    DTC is output.
    		A
    DTC is not output.
    		B


B
USE SIMULATION METHOD TO CHECK (Click here)
A

REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (Click here)  

3.CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - TILT AND TELESCOPIC SWITCH)

  1. Disconnect the I15 multiplex tilt and telescopic ECU connector.

  1. Disconnect the I26 tilt and telescopic switch connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    I15-5 (VC) - I26-1 (VC)
    		Always
    		Below 1 Ω
    I15-18 (MSW) - I26-3 (MSW)
    I15-5 (VC) - Body ground
    		10 kΩ or higher
    I15-18 (MSW) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    C240240E07

  1. Reconnect the I15 multiplex tilt and telescopic ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    I15-5 (VC) - I15-18 (MSW)
    		Engine switch on (IG)
    		4.9 to 5.1 V
    Text in Illustration 
    *a
    		Component with harness connected
    (Multiplex Tilt and Telescopic ECU)


NG
REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (Click here)
OK


5.CHECK TILT AND TELESCOPIC SWITCH


    C240949E01

  1. Remove the tilt and telescopic switch (Click here).

  1. 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
Text in Illustration 
*a
Component without harness connected
(Tilt and Telescopic Switch)


NG
REPLACE TILT AND TELESCOPIC SWITCH (Click here)
OK

REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (Click here)