Lexus NX: Combination Meter ECU Communication Stop Mode

Lexus NX Service Manual / Power Source & Network / Networking / Can Communication System / Combination Meter ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Combination Meter ECU Communication Stop Mode

Any of the following conditions are met:

  • Communication stop for "Combination Meter" is indicated on the "Communication Bus Check" screen of the Techstream.

    Click here

  • Communication system DTCs (DTCs that start with U) that correspond to "Combination Meter ECU Communication Stop Mode" in "DTC Combination Table" are output.

    Click here

  • Combination meter assembly main wire or connector
  • Power source circuit of combination meter assembly
  • Combination meter assembly ground circuit
  • Combination meter assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

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

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

    Click here

  • When disconnecting and reconnecting the auxiliary battery.

    Click here

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here

  • 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

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

HINT:

  • Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.

CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER ASSEMBLY MAIN WIRE)

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

(b) Disconnect the combination meter assembly connector.

*a

Front view of wire harness connector

(to Combination Meter Assembly)

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I10-29 (CANH) - I10-30 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I10-31 (ES) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

*a

Front view of wire harness connector

(to Combination Meter Assembly)

(b) Reconnect the cable to the negative (-) auxiliary battery terminal.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I10-21 (IG+) - Body ground

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

I10-22 (B) - Body ground

Power switch off

11 to 14 V

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

READ NEXT:

 Certification ECU Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Certification ECU Communication Stop Mode Any of the following conditions are met: Communication stop for "Certification (Smart)" is ind

 Center Airbag Sensor Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Center Airbag Sensor Communication Stop Mode Any of the following conditions are met: Communication stop for "Airbag" is indicated on th

 Parking Assist ECU Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Parking Assist ECU Communication Stop Mode Any of the following conditions are met: Communication stop for "Panoramic View Monitor / Cir

SEE MORE:

 Adjustment

ADJUSTMENT PROCEDURE 1. INSPECT SHIFT LEVER POSITION SENSOR POSITION (a) Apply the parking brake. (b) Lock the wheels with chocks to secure the vehicle. (c) Turn the power switch on (READY). (d) Move the shift lever to D and release the brake. NOTICE: Be sure to apply the parking brake and lock the

 Operation Check

OPERATION CHECK CHECK BASIC FUNCTIONS (a) When the back door is partially closed, check that the motor operates to fully close (lock) the back door. (b) Check that the back door can be opened. (c) When the back door is partially closed and then the motor starts normal operation, push the back door o

© 2016-2024 Copyright www.lexunx.com