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

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is stored during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" bel ...

Manual Button Malfunction (B15C5)

DESCRIPTION This DTC is stored when the DCM (Telematics Transceiver) detects an open or short circuit in the manual (SOS) switch. DTC Code DTC Detection Condition ...

Other materials about Toyota 4Runner:

Combination Meter ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Combination Meter ECU Communication Stop Mode Either condition is met: "Combination Meter" is not displayed on the "CAN B ...

Inspection
INSPECTION PROCEDURE 1. INSPECT NO. 1 SPEAKER ASSEMBLY WITH BOX (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Sp ...