Dtc B2603 Tilt And Telescopic Manual Switch Circuit Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (TILT UP/DOWN SWITCH, TELESCO SHORT/LONG SWITCH)

CONFIRM DTC

CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - HEADLIGHT DIMMER SWITCH OR WINDSHIELD WIPER SWITCH)

CHECK MULTIPLEX TILT AND TELESCOPIC ECU (VC TERMINAL VOLTAGE)

CHECK TILT AND TELESCOPIC SWITCH

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

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2603 Tilt And Telescopic Manual Switch Circuit Malfunction


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2603 Tilt And Telescopic Manual Switch Circuit Malfunction


INSPECTION 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.

    Tilt & Telescopic
    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.


NG
Go to step 3
OK


2.CONFIRM DTC

  1. Clear the DTCs (LandCruiser RM000000XZH069X.html).

  1. Check for DTCs (LandCruiser RM000000XZH069X.html).

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


B
USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)
A

REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (LandCruiser RM0000039SD01GX.html)

3.CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - HEADLIGHT DIMMER SWITCH OR WINDSHIELD WIPER SWITCH)

  1. Disconnect the G116 multiplex tilt and telescopic ECU connector.

  1. Disconnect the G44 headlight dimmer switch or G120 windshield wiper switch connector.

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

    Standard Resistance:
    for Headlight Dimmer Switch LH Side Type:
    Tester Connection
    		Condition
    		Specified Condition
    G116-4 (VC) - G44-8 (VC)
    		Always
    		Below 1 Ω
    G116-3 (MSW) - G44-10 (MSW)
    G44-8 (VC) - Body ground
    		Always
    		10 kΩ or higher
    G44-10 (MSW) - Body ground
    for Headlight Dimmer Switch RH Side Type:
    Tester Connection
    		Condition
    		Specified Condition
    G116-4 (VC) - G120-12 (VC)
    		Always
    		Below 1 Ω
    G116-3 (MSW) - G120-13 (MSW)
    G120-12 (VC) - Body ground
    		Always
    		10 kΩ or higher
    G120-13 (MSW) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2603 Tilt And Telescopic Manual Switch Circuit Malfunction

  1. Reconnect the G116 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
    G116-4 (VC) - G116-3 (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 (LandCruiser RM0000039SD01GX.html)
OK


5.CHECK TILT AND TELESCOPIC SWITCH


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System. Dtc B2603 Tilt And Telescopic Manual Switch Circuit Malfunction

  1. Remove the tilt and telescopic switch (LandCruiser RM000000WAD0DAX.html).

  1. 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
    		Proceed to
    NG
    		A
    OK
    		for Headlight Dimmer Switch LH Side Type
    		B
    for Headlight Dimmer Switch RH Side Type
    		C
    Text in Illustration
    *a
    		Component without harness connected
    (Tilt and Telescopic Switch)


B
REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY (LandCruiser RM000003QJL01EX.html)

C
REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY (LandCruiser RM000002ZQ604TX.html)
A

REPLACE TILT AND TELESCOPIC SWITCH (LandCruiser RM000000WAD0DAX.html)