PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: TERMINALS OF ECU (2008 Sequoia)

TERMINALS OF ECU

1. CHECK CLEARANCE WARNING ECU

(a) Disconnect the H43 clearance warning ECU connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
H43-1 (PL) - H43-21 (E)	P - W-B	Parking position signal	Ignition switch ON, shift lever not in P	Below 1.5 V
H43-1 (PL) - H43-21 (E)	P - W-B	Parking position signal	Ignition switch ON, shift lever in P	7 V or higher
H43-3 (SPD) - H43-21 (E)	V - W-B	Vehicle speed signal	Ignition switch ON, drive wheels are turned slowly	Alternating between 1.5 to 4.5 V
H43-6 (SOR) - H43-22 (E2)	LG - P	Rear sensor communication signal	Ignition switch ON, clearance sonar main switch ON	Waveform 2
H43-7 (SOF) - H43-23 (E1)	GR - G	Front sensor communication signal	Ignition switch ON, clearance sonar main switch ON	Waveform 2
H43-9 (BOF) - H43-21 (E)	V - W-B	Ultrasonic sensor power source	Ignition switch ON, clearance sonar main switch ON	7.2 to 8.8 V
H43-10 (IG) - H43-21 (E)	O - W-B	IG signal	Ignition switch ON, clearance sonar main switch OFF	Below 1.5 V
H43-10 (IG) - H43-21 (E)	O - W-B	IG power source	Ignition switch ON, clearance sonar main switch ON	9 to 15 V
H43-11 (TL) - H43-21 (E)	L - W-B	Illumination light	Ignition switch ON and light control switch OFF	Below 1.5 V
H43-11 (TL) - H43-21 (E)	L - W-B	Illumination light	Ignition switch and light control switch ON	7 V or higher
H43-12 (BBZ) - H43-21 (E)	Y - W-B	Clearance warning buzzer	Clearance warning buzzer sounding (when the back sonar or clearance sonar senses something)	Waveform 1
H43-13 (RL) - H43-21 (E)	LG - W-B	Reverse position signal	Ignition switch ON, shift lever not in R	Below 1.5 V
H43-13 (RL) - H43-21 (E)	LG - W-B	Reverse position signal	Ignition switch ON, shift lever in R	7 V or higher
H43-15 (L1) - H43-21 (E)	G - W-B	Rear corner ultrasonic sensor RH	Clearance warning indicator LED for rear corner sensor RH illuminates	Below 3 V
H43-16 (L2) - H43-21(E)	V - W-B	Front corner ultrasonic sensor RH	Clearance warning indicator LED for front corner sensor RH illuminates	Below 3 V
H43-17 (L3) - H43-21 (E)	GR - W-B	Rear corner ultrasonic sensor LH	Clearance warning indicator LED for rear corner sensor LH illuminates	Below 3 V
H43-18 (L4) - H43-21 (E)	LG - W-B	Front corner ultrasonic sensor LH	Clearance warning indicator LED for front corner sensor LH illuminates	Below 3 V
H43-19 (L5) - H43-21 (E)	O - W-B	Back ultrasonic sensor LH and RH	Clearance warning indicator LED for back sensor LH and RH illuminates	Below 3 V
H43-20 (L6) - H43-21 (E)	R - W-B	Clearance warning ECU signal	Clearance warning indicator's operation indicator illuminates	Below 3 V
H43-21 (E) - Body ground	W-B - Body ground	ECU ground	Always	Below 1 Ω
H43-22 (E2) - H43-21 (E)	P - W-B	ECU ground	Always	Below 1 Ω
H43-23 (E1) - H43-21 (E)	G - W-B	ECU ground	Always	Below 1 Ω
H43-24 (BOR) - H43-21 (E)	Y - W-B	Ultrasonic sensor power source	Ignition switch ON, clearance sonar main switch ON	7.2 to 8.8 V

Waveform 1

Terminal Connection	H43-12 (BBZ) - H43-21 (E)
Tester Range	2 V/DIV., 200 μsec./DIV.
Vehicle Condition	When sonar detects obstacle (buzzer sounds)

(d) Using an oscilloscope, check waveform 2.

Waveform 2

Terminal Connection

CH: 1 H43-7 (SOF) - H43-23 (E1)

CH: 2 H43-6 (SOR) - H43-22 (E2)

Tester Range

2 V/DIV., 200 μsec./DIV.

Vehicle Condition

Ignition switch ON, clearance sonar main switch ON.