Toyota 4Runner manuals

Toyota 4Runner: Airbag Signal Malfunction/Not Input (B15C4)

DESCRIPTION

If the DCM (Telematics Transceiver) detects an error in the communication between the DCM (Telematics Transceiver) and center airbag sensor assembly as a result of the DCM (Telematics Transceiver) self check, this DTC will be set.

DTC Code

DTC Detection Condition

Trouble Area

B15C4

The DCM (Telematics Transceiver) detects an error in the signals from the center airbag sensor assembly when the ignition switch is ON.

  • Airbag system
  • Harness or connector
  • Center airbag sensor assembly
  • DCM (Telematics Transceiver)

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution in the SRS (See page )


PROCEDURE

1.

CHECK FOR DTC (AIRBAG SYSTEM)

(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) Check the DTC of "AIRBAG SYSTEM" (See page
).

Result

Result

Proceed to

DTC B15C4 is not output

A

DTC B15C4 is output

B


B

GO TO AIRBAG SYSTEM

A

2.

CHECK DCM (TELEMATICS TRANSCEIVER) (GSW SIGNAL)

(a) Remove the DCM (Telematics Transceiver) with the connectors connected (See page ).



(b) Measure the voltage according to the value(s) in the table below.

Waveform

Item

Content

Tester connection

F39-24 (GSW) - Body ground

Tool setting

5.0 V/DIV., 20 ms/DIV.

Vehicle condition

Ignition switch ON

Text in Illustration

*a

Component with harness connected

(DCM [Telematics Transceiver])

Result

Result

Proceed to

Higher than A

A

Below A

B

A

C


B

GO TO STEP 4


C

GO TO STEP 5

A

3.

CHECK HARNESS AND CONNECTOR (FOR OPEN CIRCUIT)

(a) Remove the center airbag sensor assembly with the connectors connected (See page ).



(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F33-24 (GSW3) - Body ground

Ignition switch ON

8.5 V or higher

Waveform

Item

Content

Tester connection

F33-24 (GSW3) - Body ground

Tool setting

5.0 V/DIV., 20 ms/DIV.

Vehicle condition

Ignition switch ON

Text in Illustration

*a

Component with harness connected

(Center Airbag Sensor Assembly)


OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK HARNESS AND CONNECTOR (FOR SHORT CIRCUIT)

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


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F39-24 (GSW) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to DCM [Telematics Transceiver])


NG

GO TO STEP 6

OK

5.

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

6.

CHECK HARNESS AND CONNECTOR (DCM - CENTER AIRBAG SENSOR ASSEMBLY)

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


(b) Disconnect the F33 center airbag sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F39-24 (GSW) - F33-24 (GSW3)

Always

Below 1 Ω

F39-24 (GSW) - 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 Center Airbag Sensor Assembly)


OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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