TERMINALS OF ECU CHECK VEHICLE APPROACHING SPEAKER CONTROLLER
 (a) Disconnect the G38 vehicle approaching speaker controller connector.
(b) Measure the voltage and resistance according to the value(s) in the table below. |
Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition | |
G38-1 (IG) - Body ground |
LA-B - Body ground |
IG power supply | Power switch on (IG) |
11 to 14 V | |
Power switch off | Below 1 V | |
G38-7 (GND) - Body ground |
W-B - Body ground | Ground |
Always | Below 1 Ω |
(c) Connect the G38 vehicle approaching speaker controller connector. (d) Measure the voltage and check for pulses according to the value(s) in the table below. |
Terminal No. (Symbol) | Wiring Color |
Terminal Description | Condition |
Specified Condition | |
G38-2 (STP) - G38-7 (GND) |
LA-L - W-B |
Stop light signal input |
Power switch off, brake pedal depressed |
8 V or higher | |
Power switch off, brake pedal released |
Below 1 V | |
G38-3 (SP+) - G38-8 (SP-) |
P - LG | Vehicle approaching speaker output |
Vehicle approaching speaker operating |
A waveform synchronized with the sound is output (See Waveform 1) | |
G38-6 (SPD) - G38-7 (GND) |
G - W-B | Speed signal input |
Power switch on (IG), wheel being rotated |
Pulse generation (See Waveform 2) | |
G38-9 (PRST) - G38-7 (GND) |
LG - W-B | SIL communication signal |
Power switch on (IG), communication occurring |
Pulse generation (See Waveform 3) | |
G38-10 (IND) - G38-7 (GND) |
B - W-B | Warning signal output |
Approximately 3 seconds after turning power switch on (IG) |
Below 1 V | |
G38-11 (KOK) - G38-7 (GND) |
BE - W-B |
Permission signal | Power switch on (READY), shift lever in P |
Below 2.3 V | |
Power switch on (READY), engine stopped and shift lever not in P |
8 V or higher | (1) Waveform 1
 |
Item | Condition | |
Tester Connection | G38-3 (SP+) - G38-8 (SP-) | |
Tool Setting | 1 V/DIV., 200 ms./DIV. | |
Condition | Vehicle approaching speaker operating |
(2) Waveform 2  |
Item | Condition | |
Tester Connection | G38-6 (SPD) - G38-7 (GND) | |
Tool Setting | 5 V/DIV., 20 ms./DIV. | |
Condition | Power switch on (IG), wheel being rotated |
HINT: When
the system is functioning normally, one wheel revolution generates 4
pulses. As the vehicle speed increases, the width indicated by (A) in
the illustration narrows. (3) Waveform 3
 |
Item | Condition | |
Tester Connection | G38-9 (PRST) - G38-7 (GND) | |
Tool Setting | 5 V/DIV., 10 ms./DIV. | |
Condition | Power switch on (IG), communication occurring |
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