TERMINALS OF ECU CLEARANCE WARNING ECU ASSEMBLY
 (a) Disconnect the K34 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) | Wiring Color |
Terminal Description | Condition |
Specified Condition | |
K34-1 (IG) - K34-30 (E) |
B - BR | IG engine source signal |
Engine switch off | Below 1 V | |
Engine switch on (IG) |
11 to 14 V | |
K34-30 (E) - Body ground |
BR - Body ground | Ground |
Always | Below 1 Ω |
(c) Reconnect the K34 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 | |
K34-4 (BOF) - K34-30 (E) |
R - BR | Power source for front sensor circuit |
Engine switch off | Below 1 V |
- Engine switch on (IG)
- Intelligent clearance sonar system on
| 11 to 14 V | |
K34-6 (E5) - K34-30 (E) |
W - BR | Ground for front clearance sonar |
Always | Below 1 Ω | |
K34-8 (SOF) - K34-30 (E) |
L - BR | Front sensor communication signal (Front clearance sonar sensor) |
- Engine switch on (IG)
- Intelligent clearance sonar 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) | |
K34-14 (CBZ) - K34-13 (EF) |
LG - L | Clearance warning buzzer signal |
Buzzer sounding | Pulse generation
(Refer to waveform 2) | |
K34-22 (BOR) - K34-30 (E) |
BE - BR | Power source for rear sensor circuit |
Engine switch off | Below 1 V |
- Engine switch on (IG)
- Intelligent clearance sonar system on
| 11 to 14 V | |
K34-23 (E1) - K34-30 (E) |
GR - BR | Ground for rear clearance sonar |
Always | Below 1 Ω | |
K34-24 (SOR) - K34-30 (E) |
SB - BR | Rear sensor communication signal (Rear clearance sonar sensor) |
- Engine switch on (IG)
- Intelligent clearance sonar system on
- Shift lever in R
- Vehicle speed is less than approximately 10 km/h (6 mph)
| Pulse generation
(Refer to waveform 3) | (e) Using an oscilloscope, check waveform 1.
(1) Waveform 1 (Reference)  |
Item | Content | |
Measurement terminal | K34-8 (SOF) - K34-30 (E) | |
Measurement setting | 5 V/DIV., 1 ms./DIV. | |
Condition |
- Engine switch on (IG)
- Intelligent clearance sonar 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.
(1) Waveform 2 (Reference)
 |
Item | Content | |
Measurement terminal | K34-14 (CBZ) - K34-13 (EF) | |
Measurement setting | 2 V/DIV., 500 μs./DIV. | |
Condition | Buzzer sounding |
HINT: The amplitude of the waveform changes according to the set volume.
(g) Using an oscilloscope, check waveform 3. (1) Waveform 3 (Reference)
|
Item | Content | |
Measurement terminal | K34-24 (SOR) - K34-30 (E) | |
Measurement setting | 5 V/DIV., 1 ms./DIV. | |
Condition |
- Engine switch on (IG)
- Intelligent clearance sonar system on
- Shift lever in R
- Vehicle speed is less than approximately 10 km/h (6 mph)
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