Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001BFA5
Model Year Start: 2019 Model: Avalon Prod Date Range: [04/2018 - 08/2020]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): B15CC; Backup Battery Failure; 2019 - 2020 MY Avalon [04/2018 - 08/2020]

DTC

B15CC

Backup Battery Failure

DESCRIPTION

This DTC is set 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

B15CC

Backup Battery Failure

BUB (Back-Up Battery) malfunction
  • BUB (Back-Up Battery)
  • DCM (Telematics Transceiver)

CAUTION / NOTICE / HINT

HINT:

Before performing this diagnostic procedure, make sure to perform Health Check and confirm that the DCM/VIN registration information is correct.

Click here 2019 - 2020 MY Avalon [04/2018 - 08/2020]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): HEALTH CHECK

PROCEDURE

1.

CHECK DTC

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and wait for 10 seconds.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Recheck for DTCs.

Body Electrical > Telematics > Trouble Codes

Result

Proceed to

DTC B15CC is output

A

DTC B15CC is not output

B
B

CHECK FOR INTERMITTENT PROBLEMS

A

2.

REPLACE BUB (BACK-UP BATTERY)

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

Click here 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; 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 2019 - 2020 MY Avalon [04/2018 - 08/2020]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): ACN CALL END

NEXT

3.

CLEAR DTC

(a) Clear the DTCs.

Click here 2019 - 2020 MY Avalon [04/2018 - 08/2020]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): DTC CHECK / CLEAR

NEXT

4.

RECHECK DTC

(a) Recheck for DTCs and check if the same trouble occurs again.

Click here 2019 - 2020 MY Avalon [04/2018 - 08/2020]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): DTC CHECK / CLEAR

OK:

No DTC is output.

OK

END
NG

5.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

NOTICE:

  • The engine switch must be off.
  • Do not swap the DCM (Telematics Transceiver) with one from another vehicle.
NEXT

PERFORM DCM ACTIVATION