Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CLEARANCE WARNING ECU ASSEMBLY
(a) Disconnect the N41 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 |
|---|---|---|---|---|
| N41-1 (IG) - N41-30 (E) | B - W-B | IG engine source signal | Engine switch off | Below 1 V |
| Engine switch on (IG) | 11 to 14 V*1 10.5 to 16 V*2 | |||
| N41-30 (E) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
- *1: w/o Stop and Start System
- *2: w/ Stop and Start System
(c) Reconnect the N41 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 |
|---|---|---|---|---|
| N41-4 (BOF) - N41-30 (E) | R - W-B | Power source for front sensor circuit | Engine switch off | Below 1 V |
| 11 to 14 V | |||
| N41-6 (E5) - N41-30 (E) | W - W-B | Ground for front clearance sonar | Always | Below 1 Ω |
| N41-8 (SOF) - N41-30 (E) | B - W-B | Front sensor communication signal (Front clearance sonar sensor) |
| Pulse generation (Refer to waveform 1) |
| N41-14 (CBZ) - N41-13 (EF) | LG - L | No. 1 clearance warning buzzer signal | Buzzer sounding | Pulse generation (Refer to waveform 2) |
| N41-15 (BBZ) - N41-16 (ER) | G - BE | No. 2 clearance warning buzzer signal | Buzzer sounding | Pulse generation (Refer to waveform 2) |
| N41-22 (BOR) - N41-30 (E) | LG - W-B | Power source for rear sensor circuit | Engine switch off | Below 1 V |
| 11 to 14 V | |||
| N41-23 (E1) - N41-30 (E) | GR - W-B | Ground for rear clearance sonar | Always | Below 1 Ω |
| N41-24 (SOR) - N41-30 (E) | SB - W-B | Rear sensor communication signal (Rear clearance sonar sensor) |
| Pulse generation (Refer to waveform 3) |
(e) Using an oscilloscope, check waveform 1.
(1) Waveform 1 (Reference)
| Item | Content |
|---|---|
| Measurement terminal | N41-8 (SOF) - N41-30 (E) |
| Measurement setting | 5 V/DIV., 1 ms./DIV. |
| Condition |
|
(f) Using an oscilloscope, check waveform 2.
(1) Waveform 2 (Reference)
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| Item | Content |
|---|---|
| Measurement terminal | N41-14 (CBZ) - N41-13 (EF) N41-15 (BBZ) - N41-16 (ER) |
| 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 | N41-24 (SOR) - N41-30 (E) |
| Measurement setting | 5 V/DIV., 1 ms./DIV. |
| Condition |
|
COMBINATION METER ASSEMBLY
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ECM
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BLIND SPOT MONITOR SENSOR
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REAR TELEVISION CAMERA ASSEMBLY (w/ Panoramic View Monitor System)
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Control Module Communication Bus "A" Off (U0073,U0100,U0124,U0126,U0129,U0140,U0155,U0164,U0265)
DESCRIPTION These DTCs are stored if there is a malfunction in the CAN communication system connected to the clearance warning ECU assembly. HINT: If CAN communication system DTCs are stored, they may
Lost Communication with Blind Spot Monitor Slave Module (U0232,U0233)
DESCRIPTION This DTC is stored when the blind spot monitor sensor LH judges that there is a communication problem with the blind spot monitor sensor RH. DTC No. Detection Item DTC Detection Con
CAN Communication Failure (Message Registry) (U1000)
DESCRIPTION When the clearance warning ECU assembly determines that the CAN communication circuit is malfunctioning during self diagnosis, DTC U1000 is stored. DTC No. Detection Item DTC Detect
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Inspection
INSPECTION CAUTION / NOTICE / HINT NOTICE:
Make sure the contact surface of the cam timing control motor with EDU assembly (the surface that contacts the No. 2 timing gear cover assembly) is free of foreign matter.
If the cam timing control motor with EDU assembly has been struck or dropped, re
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Because the order of diagnosis is important to allow correct diagnosis, make sure to begin trouble
