Lexus NX manuals

Lexus NX: Open in One Side of Bus 5 Branch Line

Lexus NX Service Manual / Power Source & Network / Networking / Can Communication System / Open in One Side of Bus 5 Branch Line

DESCRIPTION

When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen that is indicated as not communicating or whose connection status on the "Communication Bus Check" screen changes intermittently, an open in one of the wires of a CAN bus branch line is suspected.

HINT:

If there is an ECU or sensor whose connection status changes intermittently while checking the "Communication Bus Check" screen, there may be an open circuit in one of the wires of a branch line of an ECU or sensor in the bus. If an open occurs in one of the wires of a CAN branch line, it may interfere with the communication of other ECUs or sensors resulting in an incorrect state being displayed.

Symptom

Trouble Area
*1: w/ Pre-collision System

*2: w/ Intuitive Parking Assist System

*3: w/ Panoramic View Monitor System

*4: w/ Blind Spot Monitor System

*5: w/ Adaptive Variable Suspension System

There is an ECU or sensor that is indicated as not communicating on the "Communication Bus Check" screen or whose connection status on the "Communication Bus Check" screen changes intermittently.

One side of CAN branch wire is open, or output signals are incomplete.

  • Forward recognition camera*1
  • Clearance warning ECU assembly*2
  • Millimeter wave radar sensor assembly*1
  • Parking assist ECU*3
  • Blind spot monitor sensor LH*4
  • Rear television camera assembly
  • Absorber control ECU*5
  • Vehicle approaching speaker controller

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

  • 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.

    Click here

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

    Click here

PROCEDURE

1.

CHECK FOR OPEN IN ONE SIDE OF BUS 5 BRANCH WIRE

(a) Based on the vehicle equipment and specifications, confirm the systems that use CAN communication.

Click here

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) Using the Techstream, perform "CAN Bus Check".

Click here

CAN Bus Check

(f) Observe the screen for approximately 2 minutes to check for ECUs and sensors that are displayed as not communicating.

(g) Perform the inspection as specified in the Problem Symptoms Table for the ECUs or sensors that are not communicating.

NEXT

GO TO CORRESPONDING COMMUNICATION STOP MODE

READ NEXT:

 Front Camera Module Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Front Camera Module Communication Stop Mode Any of the following conditions are met: Communication stop for "Front Camera Module" is ind

 Lin Communication System

 Parts Location

PARTS LOCATION ILLUSTRATION *A w/ Rain Sensor *B w/ Sliding Roof System *C w/ Hands Free Power Back Door - - *1 FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH *2 FRONT PO

SEE MORE:

 Removal

REMOVAL CAUTION / NOTICE / HINT CAUTION: Wear protective gloves. Sharp areas on the parts may injure your hands. PROCEDURE 1. REMOVE REAR SEATBACK ASSEMBLY LH (a) for Manual Seat: Click here (b) for Power Seat: Click here 2. REMOVE REAR SEATBACK ASSEMBLY RH (a) for Manual Seat: Click here (b)

 Removal

REMOVAL CAUTION / NOTICE / HINT CAUTION: Wear protective gloves. Sharp areas on the parts may injure your hands. HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. PROCEDURE 1. REMOVE FRONT SEAT ASSEMBLY LH Click here 2. REMOVE FRONT LOWER

© 2016-2024 Copyright www.lexunx.com