RM38T0EC _56 Audio / Visual / Telematics _111969 PARK ASSIST / MONITORING _0514279 TOYOTA PARKING ASSIST-SENSOR SYSTEM U

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

CLEARANCE WARNING ECU ASSEMBLY

3.333,0.167 3.833,0.417 0.5,0.25 3.458,0.219 3.917,0.417 0.458,0.198 10 false I24

Disconnect the I24 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
I24-1 (IG) - I24-31 (E)	IG power source signal	Ignition switch off	Below 1 V
I24-1 (IG) - I24-31 (E)	IG power source signal	Ignition switch ON	11 to 14 V1 10.5 to 16 V2
I24-31 (E) - Body ground	Ground	Always	Below 1 Ω

*1: for HEV Model

*2: for Gasoline Model

Reconnect the I24 clearance warning ECU assembly connector.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
I24-2 (BOF) - I24-31 (E)	Power source for front sensor circuit	Ignition switch off	Below 1 V
I24-2 (BOF) - I24-31 (E)	Power source for front sensor circuit	· Ignition switch ON · Toyota parking assist-sensor system on	11 to 14 V
I24-4 (SOF) - I24-31 (E)	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 is less than approximately 10 km/h (6 mph)	Pulse generation (Refer to waveform 1)
I24-3 (E5) - I24-31 (E)	Ground for front clearance sonar	Always	Below 1 Ω
I24-19 (BOR) - I24-31 (E)	Power source for rear sensor circuit	Ignition switch off	Below 1 V
I24-19 (BOR) - I24-31 (E)	Power source for rear sensor circuit	· Ignition switch ON · Toyota parking assist-sensor system on	11 to 14 V
I24-21 (SOR) - I24-31 (E)	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 3)
I24-20 (E1) - I24-31 (E)	Ground for rear clearance sonar	Always	Below 1 Ω

Using an oscilloscope, check waveform 1.

0.156,1 0.615,1.198 0.458,0.198 10 false 11 V

Waveform 1 (Reference)

Item	Content
Measurement terminal	I24-4 (SOF) - I24-31 (E)
Measurement setting	1 V/DIV., 100 μs./DIV.
Condition	· Ignition switch ON · Toyota parking assist-sensor system on · Shift lever in any position other than P · Vehicle speed is less than approximately 10 km/h (6 mph)

Using an oscilloscope, check waveform 3.

0.156,1 0.615,1.198 0.458,0.198 10 false 11 V

Waveform 3 (Reference)

Item	Content
Measurement terminal	I24-21 (SOR) - I24-31 (E)
Measurement setting	1 V/DIV., 100 μs./DIV.
Condition	· Ignition switch ON · Toyota parking assist-sensor system on · Shift lever in R