PARK ASSIST / MONITORING TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU
CLEARANCE WARNING ECU ASSEMBLY
Disconnect the N48 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) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| N48-12 (IG) - N48-27 (E) | P - W-B | IG power source signal | Ignition switch off | Below 1 V |
| Ignition switch ON | 11 to 14 V | |||
| N48-27 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| N48-38 (CLSW) - N48-27 (E) | B - W-B | Back sonar or clearance sonar switch assembly power source signal | Ignition switch ON, back sonar or clearance sonar switch assembly off | Below 1 V |
| Ignition switch ON, back sonar or clearance sonar switch assembly on | 11 to 14 V |
Reconnect the N48 clearance warning ECU assembly connector.
Measure the resistance and check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
|
*1: except Manual Transmission *2: for Manual Transmission |
||||
| N48-1 (S1) - N48-2 (E1) | G - R | Sensor communication signal (Rear right sensor) | Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in R | Pulse generation
(See waveform 2) |
| N48-2 (E1) - N48-27 (E) | R - W-B | Ground for sensor (Rear right sensor) | Always | Below 1 Ω |
| N48-3 (S2) - N48-4 (E2) | P - V | Sensor communication signal (Rear left sensor) | Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in R | Pulse generation
(See waveform 2) |
| N48-4 (E2) - N48-27 (E) | V - W-B | Ground for sensor (Rear left sensor) | Always | Below 1 Ω |
| N48-6 (S3) - N48-7 (E3) | L - LG | Sensor communication signal (Rear right center sensor) | Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in R | Pulse generation
(See waveform 2) |
| N48-7 (E3) - N48-27 (E) | LG - W-B | Ground for sensor (Rear right center sensor) | Always | Below 1 Ω |
| N48-8 (S4) - N48-9 (E4) | GR - SB | Sensor communication signal (Rear left center sensor) | Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in R | Pulse generation
(See waveform 2) |
| N48-9 (E4) - N48-27 (E) | SB - W-B | Ground for sensor (Rear left center sensor) | Always | Below 1 Ω |
| N48-11 (CBZ) - N48-10 (EF) | BE - Y | Clearance warning buzzer signal | Buzzer sounding | Pulse generation
(See waveform 1) |
| N48-17 (R1) | L | CAN communication signal | - | - |
| N48-18 (R2) | W | CAN communication signal | - | - |
| N48-19 (S5) - N48-20 (E5) | LG - W | Sensor communication signal (Front right sensor) | Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in R | Pulse generation
(See waveform 2) |
| Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in any position other than P or R*1
·
Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing ·
Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing |
||||
| Ignition switch ON, TOYOTA parking assist-sensor system on, parking brake is released, shift position in any position other than R*2
·
Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing ·
Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing |
||||
| N48-20 (E5) - N48-27 (E) | W - W-B | Ground for sensor (Front right sensor) | Always | Below 1 Ω |
| N48-21 (S6) - N48-22 (E6) | G - W | Sensor communication signal (Front left sensor) | Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in R | Pulse generation
(See waveform 2) |
| Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in any position other than P or R*1
·
Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing ·
Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing |
||||
| Ignition switch ON, TOYOTA parking assist-sensor system on, parking brake is released, shift position in any position other than R*2
·
Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing ·
Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing |
||||
| N48-22 (E6) - N48-27 (E) | W - W-B | Ground for sensor (Front left sensor) | Always | Below 1 Ω |
Using an oscilloscope, check waveform 1.
Waveform 1 (Reference)
| Item | Content |
|---|---|
| Terminal No. (Symbol) | N48-11 (CBZ) - N48-10 (EF) |
| Tool Setting | 2 V/DIV., 200 μsec./DIV. |
| Condition | Buzzer sounding |
- HINT:
-
The amplitude of the waveform changes according to the set volume.
-
The illustration shows the situation when the buzzer volume is set to medium.
Using an oscilloscope, check waveform 2.
Waveform 2 (Reference)
| Item | Content |
|---|---|
| Terminal No. (Symbol) | N48-1 (S1) - N48-2 (E1)
N48-3 (S2) - N48-4 (E2) N48-6 (S3) - N48-7 (E3) N48-8 (S4) - N48-9 (E4) |
| Tool Setting | 2 V/DIV., 100 μsec./DIV. |
| Condition | Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in R |
| Item | Content |
|---|---|
| Terminal No. (Symbol) | N48-19 (S5) - N48-20 (E5)
N48-21 (S6) - N48-22 (E6) |
| Tool Setting | 2 V/DIV., 100 μsec./DIV. |
| Condition | Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in R |
| Ignition switch ON, TOYOTA parking assist-sensor system on, shift position in any position other than P or R*1
·
Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing ·
Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing |
|
| Ignition switch ON, TOYOTA parking assist-sensor system on, parking brake is released, shift position in any position other than R*2
·
Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing ·
Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing |
*1: except Manual Transmission
*2: for Manual Transmission