DTC B15C4-64: Airbag Signal Signal Plausibility Failure [10/2022 - ]: Procedure

Pre-procedure1

1. Turn the ignition switch to ON and wait for 10 seconds.

   Procedure1

2. Check the DTC of "AIRBAG SYSTEM".

   Body Electrical > SRS Airbag > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTCs are output	B

   Post-procedure1

3. None

Result: 

B 

GO TO AIRBAG SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2020 - ] 

Result: 

A 

See step  2

Pre-procedure1

1. Turn the ignition switch to ON and wait for 10 seconds or more.

   Procedure1

2. Clear the DTCs.

   Body Electrical > Telematics > Clear DTCs 

   Result

   Proceed to
   NEXT

   Post-procedure1

3. None

Result: 

NEXT 

See step  3

1. Check for DTCs.

   Body Electrical > Telematics > Trouble Codes 

   Result

   Result	Proceed to
   B15C4-64 is not output	A
   B15C4-64 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

B 

See step  4

Pre-procedure1

1. Remove the DCM (telematics transceiver) but do not disconnect the connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   HINT: 

   Refer to REMOVAL [10/2022 - ]

   Procedure1

2. Check the input waveform.
   1. Check the signal waveform according to the condition(s) in the table below. (Check the waveform from the back of the wire harness connector of the DCM (telematics transceiver) while the airbag ECU assembly connectors are connected.)

      Reference Waveform

      Item	Condition
      Tester connection	G131-13 (GSW) - Body ground
      Tool setting	5.0 V/DIV., 20 ms/DIV.
      Vehicle condition	Ignition switch ON

      OK

      The waveform is similar to that shown in the illustration.

      Result

      Proceed to
      OK
      NG

   Post-procedure1

3. None

Result: 

NG 

See step  6

Result: 

OK 

See step  5

1. Replace the DCM (telematics transceiver).

   HINT: 

   Refer to REMOVAL [10/2022 - ]

   NOTE:

   • The ignition switch must be off.
   • Do not exchange the DCM (telematics transceiver) with one from another vehicle.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM DCM ACTIVATION. Refer to  DCM ACTIVATION [10/2022 - ] 

Pre-procedure1

1. Disconnect the G131 DCM (telematics transceiver) connector.
2. Disconnect the G70 airbag ECU assembly connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G131-13 (GSW) - G70-23 (GSW3)	Always	Below 1 Ω
   G131-13 (GSW) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. None

Result: 

OK 

REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR