Toyota Avalon Service & Repair Manual: Backup Battery Degradation (B15EC)

DESCRIPTION

This DTC is set when the DCM (Telematics Transceiver) detects either of the following conditions.

When this DTC is set, the BUB (Back-Up Battery) must be replaced.

BUB (Back-Up Battery) degradation DTC B15EC is not reported in deactive mode.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B15EC	Backup Battery Degradation	BUB (Back-Up Battery) is used up.	BUB (Back-Up Battery)

CAUTION / NOTICE / HINT

NOTICE:

If this DTC is set, be certain to replace the BUB (Back-Up Battery) with a new one.
After the BUB (Back-Up Battery) is replaced, it is necessary to clear this DTC.
The BUB (Back-Up Battery) must not be replaced while an ACN call is in progress.
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HINT:

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

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PROCEDURE

CHECK DTC

(a) Turn the engine 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 B15EC is output	A
DTC B15EC is not output	B

REPLACE BUB (BACK-UP BATTERY)

CHECK FOR INTERMITTENT PROBLEMS

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Toyota Avalon Owners Manual