Toyota 4Runner: Backup Battery Failure (B15CC)

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Cellular Communication / Safety Connect System / Backup Battery Failure (B15CC)

DESCRIPTION

This DTC is stored when the DCM (Telematics Transceiver) detects one of the following:

Open or short in the BUB (Back-Up Battery) circuit.
The BUB (Back-Up Battery) voltage drops or the BUB (Back-Up Battery) malfunctions.
The BUB (Back-Up Battery) temperature is temporarily high.

DTC Code	DTC Detection Condition	Trouble Area
B15CC	Back-up battery malfunction.	Harness or connector BUB (Back-Up Battery) DCM (Telematics Transceiver)

WIRING DIAGRAM

PROCEDURE

1.	CHECK FOR DTC

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Perform "Health Check" and check for current DTCs (See page ).

Result

Result	Proceed to
DTC B15CC is output	A
DTC B15CC is not output	B

CHECK FOR INTERMITTENT PROBLEMS

2.	CHECK HARNESS AND CONNECTOR (DCM - BUB)

(a) Disconnect the F39 DCM (Telematics Transceiver) connector.

(b) Disconnect the F40 BUB (Back-Up Battery) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F39-30 (BBI+) - F40-1 (BBO+)	Always	Below 1 Ω
F39-13 (BBI-) - F40-5 (BBO-)	Always	Below 1 Ω
F39-20 (CTR1) - F40-3 (BTR1)	Always	Below 1 Ω
F39-21 (CTR2) - F40-4 (BTR2)	Always	Below 1 Ω
F39-30 (BBI+) - Body ground	Always	10 kΩ or higher
F39-13 (BBI-) - Body ground	Always	10 kΩ or higher
F39-20 (CTR1) - Body ground	Always	10 kΩ or higher
F39-21 (CTR2) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to DCM [Telematics Transceiver])

Front view of wire harness connector

(to BUB [Back-Up Battery])

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	REPLACE BUB (BACK-UP BATTERY)

(a) Replace the BUB (Back-Up Battery) with a normal one and check that the same problem does not occur again (See page ).

NOTICE:

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

CLEAR DTC

(a) Clear the DTC (See page ).

5.	CHECK FOR DTC

(a) Check for DTCs and check that the same trouble does not occur again (See page ).

OK:

DTC B15CC is not output.

END

6.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver) (See page ).

NOTICE:

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

PERFORM DCM ACTIVATION

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