RM38T0EC _59 Vehicle Exterior _144216 ACOUSTIC VEHICLE ALERTING SYSTEM _0605971 ACOUSTIC VEHICLE ALERTING SYSTEM U

ACOUSTIC VEHICLE ALERTING SYSTEM  ACOUSTIC VEHICLE ALERTING SYSTEM  TERMINALS OF ECU  


CHECK VEHICLE APPROACHING SPEAKER CONTROLLER


A546748N02
1.802,0.771 2.302,1.021 0.5,0.25 1.906,0.813 2.521,1.01 0.615,0.198 10 false I281

a.

Disconnect the I281 vehicle approaching speaker controller connector.


b.

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

Terminal No. (Symbol) Terminal Description Condition Specified Condition
I281-7 (IG) - Body ground Power source Ignition switch off 11 to 14 V
I281-12 (GND) - Body ground Ground Always Below 1 Ω


c.

Connect the I281 vehicle approaching speaker controller connector.


d.

Check the signal waveform and check for pulses according to the condition(s) in the table below.

Terminal No. (Symbol) Terminal Description Condition Specified Condition
I281-3 (SP+) - I281-4 (SP-) Vehicle approaching speaker assembly output Vehicle approaching speaker assembly operating A waveform synchronized with the sound is output.
(See Waveform 1)
I281-1 (CANH) - I281-12 (GND) CAN communication line Ignition switch ON Pulse generation
I281-2 (CANL) - I281-12 (GND) CAN communication line Ignition switch ON Pulse generation

i.
E403623

Waveform

Item Condition
Tester Connection I281-3 (SP+) - I281-4 (SP-)
Tool Setting 1 V/DIV., 500 ms./DIV.
Condition Vehicle approaching speaker assembly operating