Toyota 4Runner manuals

Toyota 4Runner: 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.

(c) Turn the ignition switch to ON and wait for 10 seconds.

(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


B

CHECK FOR INTERMITTENT PROBLEMS

A

2.

CHECK HARNESS AND CONNECTOR (DCM - BUB)

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


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

(c) Measure the resistance according to the value(s) in the table below.

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

*a

Front view of wire harness connector

(to DCM [Telematics Transceiver])

*b

Front view of wire harness connector

(to BUB [Back-Up Battery])


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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 ).


NEXT

4.

CLEAR DTC

(a) Clear the DTC (See page ).


NEXT

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.


OK

END

NG

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.

NEXT

PERFORM DCM ACTIVATION

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