Precaution [09/2019 - 04/2020]

WARNING: This page is about a different car, the 2020 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTE:

When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the terminal is reconnected.

System Name	See Procedure
Lane Control System	Refer to INITIALIZATION [09/2019 - 04/2020]
Pre-collision System
Intelligent Clearance Sonar System
Parking Assist Monitor System
Panoramic View Monitor System
Lighting System (w/ Automatic Headlight Beam Level Control System)
Power Door Lock Control System
Power Back Door System (w/ Outside Door Control Switch)

SERVICE MODE
NOTE:
- Before servicing, enter service mode to restrain telematics communication functions and prevent the following while servicing:
  - Remote door lock and unlock operations
  - Remote power start and stop operations
  - Warning notification function.
- Service mode can be entered by using the Techstream or operating the radio and display receiver assembly.
HINT:

When a warning is generated due to a vehicle malfunction, the DCM (Telematics Transceiver) receives warning information from the combination meter assembly and sends a warning notification to the service center.
1. Service mode
  1. Enter service mode (Method 1)
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Start the engine.
    4. Turn the Techstream on.
    5. Enter the following menus: Body Electrical / Telematics
  2. Enter service mode (Method 2)
    - w/ Navigation System:
      Enter diagnostic mode of navigation system.
      
      Refer to DTC CHECK / CLEAR [09/2019 - 04/2020]
    - w/o Navigation System:
      Enter diagnostic mode of audio and visual system.
      
      Refer to DTC CHECK / CLEAR [09/2019 - 04/2020]
    HINT:
    
    Use the Techstream to cancel communication function pausing mode (Service Mode).
    
    Refer to UTILITY [09/2019 - 04/2020]
PRECAUTION FOR TELEMATICS SYSTEM
1. If replacing any of the following parts, refer to Initialization.
  Refer to INITIALIZATION [09/2019 - 04/2020]
  
  NOTE:
  If registration is not performed after replacing any of the following parts, the remote door lock and unlock and remote engine start and stop will not be available.
  1. Certification ECU (smart key ECU assembly)
  2. DCM (telematics transceiver)
  3. Main body ECU (multiplex network body ECU)
PRECAUTION FOR ACTIVATION
1. When replacing the DCM (Telematics Transceiver), perform DCM activation.
  Refer to DCM ACTIVATION [01/2019 - 04/2020]
PRECAUTION FOR TROUBLESHOOTING REMOTE SERVICE FUNCTION
1. When troubleshooting symptoms such as when part of the remote service function does not operate normally, first check that there are no third party parts connected to the DLC3. If any such parts are connected to the DLC3, some parts of the remote service function may not operate normally.
  Therefore, explain the situation to the customer, remove the parts and turn the engine switch off and on (IG) before proceeding with troubleshooting.