Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Backup Battery Failure (B15CC)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Cellular Communication / Safety Connect System(for Hv Model) / Backup Battery Failure (B15CC)

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

PROCEDURE

CHECK DTC

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(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

CHECK FOR INTERMITTENT PROBLEMS

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

NOTICE:

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

Click here

CLEAR DTC

(a) Clear the DTCs.

Click here

4.	RECHECK DTC

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

Click here

OK:

No DTC is output.

END

5.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NOTICE:

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

PERFORM DCM ACTIVATION

Manual Button Malfunction (B15C5)

Backup Battery Degradation (B15EC)

See More:

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