RM36D0EC _56 Audio / Visual / Telematics _083082 PARK ASSIST / MONITORING _0711991 TOYOTA PARKING ASSIST-SENSOR SYSTEM U

PARK ASSIST / MONITORING TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU

CLEARANCE WARNING ECU ASSEMBLY

3.375,0.219 3.823,0.458 0.448,0.24 3.427,0.26 3.885,0.458 0.458,0.198 10 false G135

Disconnect the G135 clearance warning ECU assembly connector.

Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
G135-18 (IG) - G135-38 (E)	IG power source signal	Ignition switch off	Below 1 V
G135-18 (IG) - G135-38 (E)	IG power source signal	Ignition switch ON	11 to 14 V
G135-38 (E) - Body ground	Ground	Always	Below 1 Ω

Reconnect the G135 clearance warning ECU assembly connector.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
G135-14 (BOF) - G135-38 (E)	Power source for front sensor circuit	Ignition switch off	Below 1 V
G135-14 (BOF) - G135-38 (E)	Power source for front sensor circuit	· Ignition switch ON · TOYOTA parking assist-sensor system on	Approximately 9 V
G135-15 (E5) - G135-38 (E)	Ground for front clearance sonar	Always	Below 1 Ω
G135-37 (SOF) - G135-15 (E5)	Front sensor communication signal (Front clearance sonar sensor)	· Ignition switch ON · TOYOTA parking assist-sensor system on · Shift lever in any position other than P · Vehicle speed less than approximately 10 km/h (6 mph)	Pulse generation (Refer to waveform 1)
G135-17 (CBZ) - G135-30 (EF)	No. 1 clearance warning buzzer signal	Buzzer sounding	Pulse generation (Refer to waveform 2)
G135-35 (BOR) - G135-38 (E)	Power source for rear sensor circuit	Ignition switch off	Below 1 V
G135-35 (BOR) - G135-38 (E)	Power source for rear sensor circuit	· Ignition switch ON · TOYOTA parking assist-sensor system on	Approximately 9 V
G135-34 (E1) - G135-38 (E)	Ground for rear clearance sonar	Always	Below 1 Ω
G135-11 (SOR) - G135-34 (E1)	Rear sensor communication signal (Rear clearance sonar sensor)	· Ignition switch ON · TOYOTA parking assist-sensor system on · Shift lever in R	Pulse generation (Refer to waveform 1)
G135-19 (R1)	CAN communication signal	-	-
G135-20 (R2)	CAN communication signal	-	-

Using an oscilloscope, check waveform 1.

0.188,0.927 0.625,1.146 0.438,0.219 10 false GND 0.188,1.542 0.719,1.792 0.531,0.25 10 false GND 0.052,0.604 0.458,0.771 0.406,0.167 10 false CH1 0.052,1.229 0.458,1.396 0.406,0.167 10 false CH2

Waveform 1 (Reference)

Item	Content
Measurement terminal	· CH1: G135-37 (SOF) - G135-15 (E5) · CH2: G135-11 (SOR) - G135-34 (E1)
Measurement setting	5 V/DIV., 1 ms./DIV.
Condition	· Ignition switch ON · TOYOTA parking assist-sensor system on · Shift lever in any position other than P (CH1) · Shift lever in R (CH2) · Vehicle speed less than approximately 10 km/h (6 mph) (CH1)

Using an oscilloscope, check waveform 2.

2.917,1.688 3.375,1.885 0.458,0.198 10 false GND

Waveform 2 (Reference)

Item	Content
Measurement terminal	G135-17 (CBZ) - G135-30 (EF)
Measurement setting	2 V/DIV., 500 μs./DIV.
Condition	Buzzer sounding

HINT:: The amplitude of the waveform changes according to the set volume.