DTC B15C4: Airbag Signal Malfunction/Not Input [10/2014 - ]: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and wait for 10 seconds.
4. Turn the Techstream on.
5. Check the DTC of "AIRBAG SYSTEM" (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

   Result

   Result	Proceed to
   DTC B15C4 is not output.	A
   DTC B15C4 is output.	B

Result: 

B 

GO TO AIRBAG SYSTEM 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2014 - ] )

Result: 

A 

See step  2

1. Remove the DCM (Telematics Transceiver) but do not disconnect the connectors (Refer to REMOVAL [10/2014 - ] ).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E11-24 (GSW) - Body ground	Engine switch on (IG)	6.5 to 8.5 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (DCM (Telematics Transceiver))

   REFERENCE WAVEFORM
   
   

   Item	Condition
   Tester connection	E11-24 (GSW) - Body ground
   Tool setting	5.0 V/DIV., 20 ms/DIV.
   Vehicle condition	Engine switch on (IG)

   Result

   Result	Proceed to
   8.5 V or higher	A
   Below 6.5 V	B
   6.5 V to 8.5 V	C

Result: 

B 

See step  4

Result: 

C 

See step  5

Result: 

A 

See step  3

1. Remove the airbag ECU assembly but do not disconnect the connectors (Refer to REMOVAL [10/2014 - ] ).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K4-3 (GSW3) - Body ground	Engine switch on (IG)	8.5 V or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Airbag ECU Assembly)

   REFERENCE WAVEFORM
   
   

   Item	Condition
   Tester connection	K4-3 (GSW3) - Body ground
   Tool setting	5.0 V/DIV., 20 ms/DIV.
   Vehicle condition	Engine switch on (IG)

Result: 

OK 

REPLACE AIRBAG ECU ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the E11 DCM (Telematics Transceiver) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E11-24 (GSW) - Body ground	Always	10 kΩ or higher

Result: 

NG 

See step  7

Result: 

OK 

See step  5

1. Replace the DCM (Telematics Transceiver) (Refer to REMOVAL [10/2014 - ] ).
   NOTE:

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

Result: 

NEXT 

See step  6

1. Perform "PRL UPDATE" (Refer to PRL UPDATE [10/2014 - ] ).

Result: 

NEXT 

PERFORM DCM ACTIVATION 

(Refer to DCM ACTIVATION [10/2014 - ] )

1. Disconnect the E11 DCM (Telematics Transceiver) connector.
2. Disconnect the K4 airbag ECU assembly connector (Refer to REMOVAL [10/2014 - ] ).
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E11-24 (GSW) - K4-3 (GSW3)	Always	Below 1 Ω
   E11-24 (GSW) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE AIRBAG ECU ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR