RM38N0EC _56 Audio / Visual / Telematics _111825 PARK ASSIST / MONITORING _0501856 TOYOTA PARKING ASSIST-SENSOR SYSTEM U

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


CLEARANCE WARNING ECU ASSEMBLY


E220917E84
3.375,0.219 3.74,0.458 0.365,0.24 3.438,0.25 3.896,0.448 0.458,0.198 10 false E51

a.

Disconnect the E51 clearance warning ECU assembly connector.


b.

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
E51-1 (IG) - E51-31 (E) IG power source signal Ignition switch off Below 1 V
Ignition switch ON 11 to 14 V*1
10.5 to 16 V*2
E51-31 (E) - Body ground Ground Always Below 1 Ω

*1: w/o Stop and Start System

*2: w/ Stop and Start System



c.

Reconnect the E51 clearance warning ECU assembly connector.


d.

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
E51-2 (BOF) - E51-31 (E) Power source for front sensor circuit Ignition switch off Below 1 V
·

Ignition switch ON

·

Toyota parking assist-sensor system on


11 to 14 V
E51-3 (E5) - E51-31 (E) Ground for front clearance sonar Always Below 1 Ω
E51-4 (SOF) - E51-31 (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 or R

·

Vehicle speed is less than approximately 10 km/h (6 mph)


Pulse generation
(Refer to waveform 1)
E51-9 (CBZ) - E51-8 (EF) No. 1 clearance warning buzzer signal Buzzer sounding Pulse generation
(Refer to waveform 3)
E51-19 (BOR) - E51-31 (E) Power source for rear sensor circuit Ignition switch off Below 1 V
·

Ignition switch ON

·

Toyota parking assist-sensor system on


11 to 14 V
E51-20 (E1) - E51-31 (E) Ground for rear clearance sonar Always Below 1 Ω
E51-21 (SOR) - E51-31 (E) Rear sensor communication signal (Rear clearance sonar sensor)
·

Ignition switch ON

·

Toyota parking assist-sensor system on

·

Shift lever in R

·

Vehicle speed is less than approximately 10 km/h (6 mph)


Pulse generation
(Refer to waveform 2)
E51-26 (BBZ) - E51-25 (ER) No. 2 clearance warning buzzer signal Buzzer sounding Pulse generation
(Refer to waveform 3)


e.

Using an oscilloscope, check waveform 1.

i.
E434397E01
0.156,1 0.615,1.198 0.458,0.198 10 false 11 V

Waveform 1 (Reference)

Item Content
Measurement terminal E51-4 (SOF) - E51-31 (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 or R

·

Vehicle speed is less than approximately 10 km/h (6 mph)





f.

Using an oscilloscope, check waveform 2.

i.
E434397E01
0.156,1 0.615,1.198 0.458,0.198 10 false 11 V

Waveform 2 (Reference)

Item Content
Measurement terminal E51-21 (SOR) - E51-31 (E)
Measurement setting 1 V/DIV., 100 μs./DIV.
Condition
·

Ignition switch ON

·

Toyota parking assist-sensor system on

·

Shift lever in R

·

Vehicle speed is less than approximately 10 km/h (6 mph)





g.

Using an oscilloscope, check waveform 3.

i.
E227014N05
0.083,1.677 0.552,1.938 0.469,0.26 10 GND

Waveform 3 (Reference)

Item Content
Measurement terminal E51-9 (CBZ) - E51-8 (EF)
E51-26 (BBZ) - E51-25 (ER)
Measurement setting 2 V/DIV., 500 μs./DIV.
Condition Buzzer sounding

HINT:

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