Lexus NX: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- 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 troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
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| Symptom | Suspected Area | Link |
|---|---|---|
| The result of "How to Proceed with Troubleshooting" is "Open in Bus 2 Main Bus Line". | Open in Bus 2 Main Bus Line | |
| The result of "How to Proceed with Troubleshooting" is "Short in Bus 2 Lines". | Short in Bus 2 Lines | |
| The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 2 Line". | Short to +B in Bus 2 Line | |
| The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 2 Line". | Short to GND in Bus 2 Line | |
| The result of "How to Proceed with Troubleshooting" is "Open in One Side of Bus 2 Branch Line". | Open in One Side of Bus 2 Branch Line | |
| The result of "How to Proceed with Troubleshooting" is "Open in Bus 3 Main Bus Line". | Open in Bus 3 Main Bus Line | |
| The result of "How to Proceed with Troubleshooting" is "Short in Bus 3 Lines". | Short in Bus 3 Lines | |
| The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 3 Line". | Short to +B in Bus 3 Line | |
| The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 3 Line". | Short to GND in Bus 3 Line | |
| The result of "How to Proceed with Troubleshooting" is "Open in One Side of Bus 3 Branch Line". | Open in One Side of Bus 3 Branch Line | |
| The result of "How to Proceed with Troubleshooting" is "Open in Bus 5 Main Bus Line". | Open in Bus 5 Main Bus Line | |
| The result of "How to Proceed with Troubleshooting" is "Short in Bus 5 Lines". | Short in Bus 5 Lines | |
| The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 5 Line". | Short to +B in Bus 5 Line | |
| The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 5 Line". | Short to GND in Bus 5 Line | |
| The result of "How to Proceed with Troubleshooting" is "Open in One Side of Bus 5 Branch Line". | Open in One Side of Bus 5 Branch Line | |
HINT:
- Refer to How to Proceed with Troubleshooting for the Bus Check procedure.
- The suspected communication stop area can be determined based on the ECU or sensor that was not displayed in CAN Bus Check and by referring to the following table.
| Symptom | Suspected Area | Link |
|---|---|---|
| Communication stop for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check" screen of the Techstream. | Skid Control ECU Communication Stop Mode | |
| Communication stop for "Clearance Warning (Intuitive Parking Assist)" is indicated on the "Communication Bus Check" screen of the Techstream. | Clearance Warning ECU Communication Stop Mode | |
| Communication stop for "Air Conditioning Amplifier" is indicated on the "Communication Bus Check" screen of the Techstream. | Air Conditioning Amplifier Communication Stop Mode | |
| Communication stop for "Power Steering (EPS)" is indicated on the "Communication Bus Check" screen of the Techstream. | Power Steering ECU Communication Stop Mode | |
| Communication stop for "Spiral cable (Steering Angle Sensor)" is indicated on the "Communication Bus Check" screen of the Techstream. | Steering Angle Sensor Communication Stop Mode | |
| Communication stop for "Engine" is indicated on the "Communication Bus Check" screen of the Techstream. | ECM Communication Stop Mode | |
| Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the Techstream. | Main Body ECU Communication Stop Mode | |
| Communication stop for "Combination Meter" is indicated on the "Communication Bus Check" screen of the Techstream. | Combination Meter ECU Communication Stop Mode | |
| Communication stop for "Certification (Smart)" is indicated on the "Communication Bus Check" screen of the Techstream. | Certification ECU Communication Stop Mode | |
| Communication stop for "Airbag" is indicated on the "Communication Bus Check" screen of the Techstream. | Center Airbag Sensor Communication Stop Mode | |
| Communication stop for "Panoramic View Monitor / Circumference Monitoring Camera Control Module" is indicated on the "Communication Bus Check" screen of the Techstream. | Parking Assist ECU Communication Stop Mode | |
| Communication stop for "Suspension Control (Air Suspension)" is indicated on the "Communication Bus Check" screen of the Techstream. | Suspension Control ECU Communication Stop Mode | |
| Communication stop for "Headlight swivel (AFS)" is indicated on the "Communication Bus Check" screen of the Techstream. | Headlight ECU Communication Stop Mode | |
| Communication stop for "Electric Parking Brake" is indicated on the "Communication Bus Check" screen of the Techstream. | Electric Parking Brake ECU Communication Stop Mode | |
| Communication stop for "Hybrid Vehicle Control" is indicated on the "Communication Bus Check" screen of the Techstream. | Hybrid Vehicle Control ECU Communication Stop Mode | |
| Communication stop for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check" screen of the Techstream. | Radio Receiver Assembly Communication Stop Mode | |
| Communication stop for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check" screen of the Techstream. | Blind Spot Monitor Sensor Communication Stop Mode | |
| Communication stop for "Accessory Gateway" is indicated on the "Communication Bus Check" screen of the Techstream. | Bus Buffer ECU Communication Stop Mode | |
| Communication stop for "DCM" is indicated on the "Communication Bus Check" screen of the Techstream. | DCM Communication Stop Mode | |
| Communication stop for "ASC" is indicated on the "Communication Bus Check" screen of the Techstream. | ASC ECU Communication Stop Mode | |
| Communication stop for "Vehicle Proximity Notification System" is indicated on the "Communication Bus Check" screen of the Techstream. | Vehicle Approaching Sound ECU Communication Stop Mode | |
| Communication stop for "Head Up Display" is indicated on the "Communication Bus Check" screen of the Techstream. | Headup Display Communication Stop Mode | |
| Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the Techstream. | Millimeter Wave Radar Sensor Communication Stop Mode | |
| Communication stop for "Parking Assist Monitor System / Rear Camera" is indicated on the "Communication Bus Check" screen of the Techstream. | Rear Television Camera Communication Stop Mode | |
| Communication stop for "Front Camera Module" is indicated on the "Communication Bus Check" screen of the Techstream. | Front Camera Module Communication Stop Mode | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Although CAN communication is currently normal, ECUs connected to the bus 2, bus 3 and bus 5 store CAN communication DTCs. | The probable part for which communication is interrupted can be determined using DTC Combination Table and comparing the DTCs output from ECUs connected to the CAN communication system. | |
READ NEXT:
Terminals Of Ecu
TERMINALS OF ECU NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
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When discon
Diagnosis System
DIAGNOSIS SYSTEM CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION (a) The systems (ECUs and sensors) that use CAN communication vary depending on the vehicle and optional equi
Dtc Combination Table
DTC COMBINATION TABLE HOW TO INTERPRET COMMUNICATION DTCS (DTCS THAT START WITH U) (a) If a CAN communication error cannot be reproduced, determine the suspected malfunctioning part using the DTCs sto
SEE MORE:
Disassembly
DISASSEMBLY CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The following procedure is for the LH side.
PROCEDURE 1. REMOVE CYLINDER BOOT (a) Using a screwdriver with its wrapped with protective tape, remove the piston seal from the disc brake cylinder assemb
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS (a) Interview the customer and confirm the problem. Click here
NEXT 3. INSPECT AUXILIARY BATTERY VOLTAGE
