B2603 Abnormal voltage value, which is not within the specification, is input to the multiplex tilt & telescopic...

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.	Tilt & telescopic manual switch Wire harness or connector Multiplex tilt & telescopic ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

1. READ VALUE OF INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.

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

3. Select "Tilt & Telescopic".

4. Touch the "Data List" button.

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

6. 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)

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

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

3. 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)

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

2. 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)

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