DTC    B2603    Tilt and Telescopic Manual Switch Circuit Malfunction

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DESCRIPTION

Different voltage values are input to the multiplex tilt & telescopic ECU by operating the manual switch. The multiplex tilt & telescopic ECU then judges which motor and in which direction that motor should be moved based on the voltage value.

DTC No.
Detection Item
Trouble Area
B2603
Abnormal voltage value, which is not within the specification, is input to the multiplex tilt & telescopic ECU when being operated by the manual switch.
  1. Tilt & telescopic manual switch
  2. Wire harness or connector
  3. Multiplex tilt & telescopic ECU

WIRING DIAGRAM


F044514E03


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER


    F044515E01

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and turn on the intelligent tester.

  1. Select "Tilt & Telescopic".

  1. Touch the "Data List" button.

  1. Select "T & T Manual SW Data".

  1. Read voltages on the tester screen when operating the manual switch.

    Voltage:
    Manual switch position
    		Specified value
    Neutral
    		Below 0.2 V
    Tilt up
    		1.67 to 2.13 V
    Tilt down
    		0.54 to 0.74 V
    Telescopic contract
    		1.08 to 1.40 V
    Telescopic extend
    		2.22 to 2.77 V

    Result:
    Proceed to
    		Result
    A
    		Switch voltages in all directions are within the standard.
    B
    		Switch voltages in certain directions are outside the standard.
    C
    		Switch voltages in all directions are outside the standard.



A
REPLACE MULTIPLEX TILT & TELESCOPIC ECU

B
REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
C


2.CHECK HARNESS AND CONNECTOR (BETWEEN TILT & TELESCOPIC ECU AND TILT & TELESCOPIC SWITCH)


    C104131E02

  1. Disconnect the T4 connector from the multiplex tilt & telescopic ECU.

  1. Disconnect the C12 connector from the headlight dimmer switch assembly.

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

    Resistance:
    Tester connection
    (Terminal No.)
    		Condition
    		Specified value
    VC (T4-4) - VC (C12-8)
    		Always
    		Below 1 Ω
    MSW (T4-3) - MSW (C12-10)
    		Always
    		Below 1 Ω
    VC (C12-8) - Body ground
    		Always
    		10 kΩ or higher
    MSW (C12-10) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT MULTIPLEX TILT & TELESCOPIC ECU (VC TERMINAL VOLTAGE)


    F044885E03

  1. Reconnect the T4 connector to the multiplex tilt & telescopic ECU.

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

    Voltage:
    Tester connection
    (Terminal No.)
    		Condition
    		Specified value
    VC (C12-8) - MSW (C12-10)
    		IG switch ON
    		4.9 to 5.1 V



NG
REPLACE MULTIPLEX TILT & TELESCOPIC ECU
OK


4.INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY (TILT & TELESCOPIC MANUAL SWITCH)


    F045649E01

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

    Resistance:
    Tester connection
    		Condition
    (Manual switch position)
    		Specified value
    VC - MSW
    		Tilt up
    		360 Ω
    Tilt down
    		1,990 Ω
    Telescopic contract
    		790 Ω
    Telescopic extend
    		160 Ω



NG
REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
OK

REPLACE MULTIPLEX TILT & TELESCOPIC ECU