CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for HV Model): PRECAUTION; 2021 - 2022 MY Corolla Corolla HV [04/2020

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001N4PJ
Model Year Start: 2021	Model: Corolla	Prod Date Range: [04/2020 - 09/2022]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for HV Model): PRECAUTION; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL

NOTICE:

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

System Name	See Procedure
Lane Control System (for HV Model)
Pre-collision System (for HV Model)

WHEN DISCONNECTING AUXILIARY BATTERY CABLE

(a) After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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WHEN AUTOMATIC COLLISION NOTIFICATION HAS ACTIVATED

(a) Perform "ACN CALL END" with the Techstream to terminate ACN (Automatic Collision Notification) with the call center.

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WHEN DISCONNECTING CONNECTORS FROM DCM (TELEMATICS TRANSCEIVER)

(a) The power switch must be off.

WHEN REPLACING DCM (TELEMATICS TRANSCEIVER)

(a) After installing a new DCM (telematics transceiver), perform "DCM ACTIVATION" with the Techstream. This allows the Telematics service provider to register the new DCM (telematics transceiver) and to delete the old DCM (telematics transceiver) information from their database.

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NOTICE:

Do not replace the DCM (telematics transceiver) with one from another vehicle.

WHEN UNABLE TO CONTACT WITH CALL CENTER BUT NO DTC

(a) This may occur when the cellular signal strength was very weak. Check "DCM OPERATION HISTORY" with the Techstream.

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WHEN DIAGNOSING DCM (TELEMATICS TRANSCEIVER)

(a) While attempting to diagnose the DCM (telematics transceiver), do not use a DCM (telematics transceiver) from another vehicle. Each DCM (telematics transceiver) is registered to a specific VIN and should not be tested in another vehicle.

PRECAUTION FOR DCM (TELEMATICS TRANSCEIVER)

(a) The DCM (telematics transceiver) uses a LTE (Long Term Evolution) type radio wave signal. The radio wave signals and communication lines may occasionally be unstable depending on time or location factors. Therefore, network access errors may occur intermittently because of radio wave signal conditions. To determine if there is a problem, it may be necessary to make a judgment based on the frequency of the phenomenon or by making a comparison with a comparable type of cell phone.

(b) With the exception of replacing the BUB (Back-Up Battery), the DCM (telematics transceiver) cannot be disassembled (the DCM (telematics transceiver) case must not be opened).

PRECAUTION FOR BUB (BACK-UP BATTERY)

(a) The BUB (Back-Up Battery) is a lithium-ion type battery and can be charged from the DCM (telematics transceiver).

(b) When ACN (Automatic Collision Notification) is performed, the BUB (Back-Up Battery) provides power to the DCM (telematics transceiver).

NOTICE:

The BUB (Back-Up Battery) must not be replaced while an ACN call is in progress.

HINT:

When a Manual Emergency Call is made, the BUB (Back-Up Battery) is not used as the power source.

(c) When it is time to replace the BUB (Back-Up Battery), the manual (SOS) switch red indicator will come on. The DCM (telematics transceiver) will also store a DTC or specific vehicle control history (RoB) code.

PRECAUTION FOR REGISTRATION

(a) If replacing any of the following parts, refer to Initialization.

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(1) DCM (telematics transceiver)

(2) BUB (Back-Up Battery)