Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001N4Q9
Model Year Start: 2021 Model: Corolla Prod Date Range: [04/2020 -           ]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for HV Model): B15CC49; Backup Battery Internal Electronic Failure; 2021 - 2025 MY Corolla Corolla HV [04/2020 -        ]

DTC

B15CC49

Backup Battery Internal Electronic Failure

DESCRIPTION

This DTC is stored when the DCM (telematics transceiver) detects one of the following:

  • The BUB (Back-Up Battery) voltage drops or the BUB (Back-Up Battery) malfunctions.
  • The BUB (Back-Up Battery) temperature is (temporarily) high.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15CC49

Backup Battery Internal Electronic Failure

BUB (Back-Up Battery) malfunction
  • BUB (Back-Up Battery)
  • DCM (telematics transceiver)

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Safety Connect System.

Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for HV Model): PRECAUTION 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for HV Model): PRECAUTION

PROCEDURE

1.

CHECK DTC

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG) and wait for 10 seconds or more.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Check for DTCs and check that no DTCs are output.

Body Electrical > Telematics > Trouble Codes

OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK BUB (BACK-UP BATTERY)

(a) Replace the BUB (Back-Up Battery) with a normal one and check if the same problem occurs again.

Click here 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; CELLULAR COMMUNICATION: BACK-UP BATTERY: REMOVAL 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; CELLULAR COMMUNICATION: BACK-UP BATTERY: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; CELLULAR COMMUNICATION: BACK-UP BATTERY: REMOVAL

NOTICE:

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

Click here 2021 - 2025 MY Corolla Corolla HV [04/2020 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for HV Model): ACN CALL END

(b) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(c) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Telematics > Trouble Codes

OK:

No DTCs are output.

OK

PERFORM INITIALIZATION

NG

3.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver) with a new one.

Click here 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

NOTICE:

  • The power switch must be off.
  • Do not exchange the DCM (telematics transceiver) with one from another vehicle.
NEXT

PERFORM DCM ACTIVATION