- Doors cannot be locked or unlocked.
- The warning (meter buzzer) does not sound and the meter does not indicate a warning.
Lexus NX: Lost Communication with Main Body ECU (U0140,U0142,U0155,U0293,U1117)
Lexus NX Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Start Function) / Lost Communication with Main Body ECU (U0140,U0142,U0155,U0293,U1117)
DESCRIPTION
These DTCs are stored when there is a CAN communication error between the hybrid vehicle control ECU, certification ECU (smart key ECU assembly), ECM, main body ECU (multiplex network body ECU) or combination meter assembly, and data from the option connector (bus buffer ECU) cannot be received.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| U0140 | Lost Communication with Main Body ECU | CAN communication error between certification ECU (smart key ECU assembly) and main body ECU (multiplex network body ECU) (1-trip detection logic*) | Main body ECU (multiplex network body ECU) |
|
| U0142 | Lost Communication with Main Body ECU | CAN communication error between certification ECU (smart key ECU assembly) and main body ECU (multiplex network body ECU) (1-trip detection logic*) | Main body ECU (multiplex network body ECU) |
|
| U0155 | Lost Communication with Combination Meter | CAN communication error between certification ECU (smart key ECU assembly) and combination meter assembly (1-trip detection logic*) | Combination meter assembly |
|
| U0293 | Lost Communication with Hybrid Vehicle Control System | CAN communication error between certification ECU (smart key ECU assembly) and hybrid vehicle control ECU (1-trip detection logic*) | Hybrid vehicle control ECU |
|
| U1117 | Lost Communication with Accessory Gateway | Data from the option connector (bus buffer ECU) cannot be received. |
|
|
- *: Only detected while a malfunction is present.
| DTC No. | Vehicle Condition when Malfunction Detected | Fail-safe Function when Malfunction Detected |
|---|---|---|
| U0140 | The warning (meter buzzer) does not sound and the meter does not indicate a warning. | - |
| U0142 | | - |
| U0155 |
| - |
| U0293 | The warning (meter buzzer) does not sound and the meter does not indicate a warning. | - |
| U1117 | The hybrid control system cannot be started using the wireless remote control function. | - |
| DTC No. | Data List and Active Test |
|---|---|
| U0140 U0142 U0155 U0293 U1117 | - |
CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
- After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
HINT:
When the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the power source mode returns to the state it was in before the cable was disconnected.
PROCEDURE
| 1. | CHECK FOR DTC |
(a) Note any DTCs that are output.
Click here .gif)
| NEXT | .gif) | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
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Power Source Mode does not Change to ON (IG)
DESCRIPTION If the power switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source
Power Source Mode does not Change to ON (ACC)
DESCRIPTION If the power switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source
Power Source Mode does not Change to ON (READY)
DESCRIPTION When the electrical key transmitter sub-assembly is in the cabin and the power switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power sou
SEE MORE:
Removal
REMOVAL PROCEDURE 1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM Click here 2. REMOVE RADIATOR ASSEMBLY Click here 3. REMOVE FRONT BUMPER COVER (a) for Sport Package: Click here (b) except Sport Package: Click here 4. DISCONNECT DISCHARGE HOSE SUB-ASSEMBLY (a) Remove the bolt and discon
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DESCRIPTION If code verification cannot be performed in the vehicle interior, there may be problems with the communication between the vehicle (No. 1 indoor electrical key antenna assembly (front floor), No. 2 indoor electrical key antenna assembly (rear floor) or No. 3 indoor electrical key antenna
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