THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): U0100,U0129,U0142,U0155,U0293; Lost Communication With ECM/PCM "A"; 2020 - 2022 MY Corolla Corolla HV [01/2019

DESCRIPTION

These DTCs are stored when there is a CAN communication malfunction between the certification ECU (smart key ECU assembly and ECM, skid control ECU (brake actuator assembly), main body ECU (multiplex network body ECU) or combination meter assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

U0100

Lost Communication With ECM/PCM "A"

CAN communication malfunction between certification ECU (smart key ECU assembly) and ECM (1-trip detection logic*)

ECM

DTC Output Confirmation Operation:

Turn the power switch on (IG) and wait at least 10 seconds.

U0129

Lost Communication with Brake System Control Module

CAN communication malfunction between certification ECU (smart key ECU assembly) and skid control ECU (brake actuator assembly) (1-trip detection logic*)

Skid control ECU (brake actuator assembly)

DTC Output Confirmation Operation:

Turn the power switch on (IG) and wait at least 10 seconds.

U0142

Lost Communication with Body Control Module "B"

CAN communication malfunction 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)

DTC Output Confirmation Operation:

Turn the power switch on (IG) and wait at least 10 seconds.

U0155

Lost Communication with Instrument Panel Cluster (IPC) Control Module

CAN communication malfunction between certification ECU (smart key ECU assembly) and combination meter assembly (1-trip detection logic*)

Combination meter assembly

DTC Output Confirmation Operation:

Turn the power switch on (IG) and wait at least 10 seconds.

U0293

Lost Communication With Hybrid Vehicle Control System

CAN communication malfunction between certification ECU (smart key ECU assembly) and hybrid vehicle control ECU (1-trip detection logic*)

Hybrid vehicle control ECU

DTC Output Confirmation Operation:

Turn the power switch on (IG) and wait at least 10 seconds.

*: Only detected while a malfunction is present.

Vehicle Condition and Fail-safe Function when Malfunction Detected

DTC Code

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

U0100

There is no effect on vehicle behavior.

U0129

The steering lock function does not operate.

U0142

Doors cannot be locked or unlocked.
The warning (wireless buzzer) does not sound.

U0155

The warning (meter buzzer) does not sound and no warning messages displayed on the multi-information display.

U0293

The warning (meter buzzer) does not sound and no warning messages displayed on the multi-information display.

Related Data List and Active Test Items

DTC No.

Data List and Active Test

U0100

U0129

U0142

U0155

U0293

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 Key. 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".

PROCEDURE

CHECK FOR DTC

(a) Check for DTCs and note any DTCs that are output.

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2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): DTC CHECK / CLEAR