TERMINALS OF ECU
1. CLEARANCE WARNING ECU ASSEMBLY
(a) Disconnect the D79 clearance warning ECU assembly 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 |
---|---|---|---|---|
D79-9 (CLSW) - D79-30 (E) |
B - W |
Back sonar or clearance sonar switch assembly power source signal |
Engine switch on (IG), clearance sonar main switch on |
11 to 14 V |
D79-9 (CLSW) - D79-30 (E) |
B - W |
Back sonar or clearance sonar switch assembly power source signal |
Engine switch on (IG), clearance sonar main switch off |
Below 1 V |
D79-1 (IG) - D79-30 (E) |
GR - W |
IG power source signal |
Engine switch off |
Below 1 V |
Engine switch on (IG) |
11 to 14 V |
|||
D79-30 (E) - Body ground |
W - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the D79 clearance warning ECU assembly 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 |
---|---|---|---|---|
D79-22 (BOR) - D79-30 (E) |
V - W |
Power source for rear sensor circuit |
Engine switch off |
Below 1 V |
Engine switch on (IG), clearance sonar main switch on |
7.2 to 8.8 V |
|||
D79-8 (SOF) - D79-30 (E) |
LG - W |
Front sensor communication signal (Front clearance sonar sensor) |
Engine switch on (IG), clearance sonar main switch on, shift lever in R |
Pulse generation (See waveform 2) |
D79-13 (ER) - D79-30 (E) |
Y - W |
Clearance warning buzzer signal |
Buzzer sounding |
Pulse generation (See waveform 1) |
D79-23 (E1) - D79-30 (E) |
L - W |
Ground for rear clearance sonar |
Always |
Below 1 V |
D79-6 (E5) - D79-30 (E) |
BR - W |
Ground for front clearance sonar |
Always |
Below 1 V |
D79-4 (BOF) - D79-30 (E) |
W - W |
Power source for front sensor circuit |
Engine switch off |
Below 1 V |
Engine switch on (IG), clearance sonar main switch on |
7.2 to 8.8 V |
|||
D79-24 (SOR) - D79-30 (E) |
Y - W |
Rear sensor communication signal (Rear clearance sonar sensor) |
Engine switch on (IG), clearance sonar main switch on, shift lever in R |
Pulse generation (See waveform 2) |
(e) Using an oscilloscope, check waveform 1.
(1) Waveform 1 (Reference)
Item |
Content |
---|---|
Terminal No. (Symbol) |
D79-13 (ER) - D79-30 (E) |
Tool Setting |
2 V/DIV., 500 μsec./DIV. |
Vehicle Condition |
When sonar detects obstacle (buzzer sounds) |
Buzzer volume |
Buzzer sounding |
HINT:
The amplitude of the waveform changes according to the set volume.
(f) Using an oscilloscope, check waveform 2.
(1) Waveform 2 (Reference)
Item |
Content |
---|---|
Terminal No. (Symbol) |
|
Tool Setting |
5 V/DIV., 1 msec./DIV. |
Condition |
Engine switch on (IG), clearance sonar main switch on, shift lever in R |
HINT:
The waveforms for CH1 and CH2 are same.
Vehicle Speed Signal Error (Test Mode DTC) (C2191/91)
DESCRIPTION
The tire pressure warning ECU receives a vehicle speed signal from the combination
meter. This DTC is stored upon entering signal check mode (test mode), and cleared
when a vehicle speed signal of 20 km/h (12 mph) is detected for 3 seconds or ...
Removal
REMOVAL
PROCEDURE
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-)
battery terminal to disable the SRS system (See page
).
NOTICE:
When disconnecting the cable, s ...
Detection range of the sensors
1. Approximately 1.6 ft. (50 cm)
2. Approximately 4.9 ft. (150 cm)
3. Approximately 2.0 ft. (60 cm)
The diagram shows the detection range of the sensors. Note that the sensors cannot
detect obstacles that are extremely close to the vehicle.
The range o ...