DTC B15C4-64: Airbag Signal Signal Plausibility Failure [11/2021 - 10/2022]: Procedure

1. Turn the power switch off.
2. Connect the Techstream to the DLC3.
3. Turn the power 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 [10/2020 - 10/2023]

   Result

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

Result: 

B 

GO TO AIRBAG SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 10/2023] 

Result: 

A 

See step  2

1. Turn the power switch off.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG) and wait for 10 seconds or more.
4. Turn the Techstream on.
5. Check for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [10/2020 - 10/2022]

   Body Electrical > Telematics > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022] 

Result: 

NG 

See step  3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *A	w/o Advanced Drive System
   *B	w/ Advanced Drive System
   *a	Component with harness connected (DCM [Telematics Transceiver])

   Refer to REMOVAL [11/2021 - 10/2022]

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	G163-13 (GSW) - Body ground*1 G164-13 (GSW) - Body ground*2
      Tool setting	5.0 V/DIV., 20 ms/DIV.
      Vehicle condition	Power switch on (IG)

      *1: w/o Advanced Drive System

      *2: w/ Advanced Drive System

      OK

      The waveform is similar to that shown in the illustration.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  4

1. Replace the DCM (telematics transceiver).

   Refer to REMOVAL [11/2021 - 10/2022]

   NOTE:

   • The power 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 [10/2020 - 10/2022] 

1. Disconnect the G163*1 or G164*2 DCM (telematics transceiver) connector.
   1. *1: w/o Advanced Drive System
   2. *2: w/ Advanced Drive System
2. Disconnect the G11 airbag ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   W/O ADVANCED DRIVE SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   G163-13 (GSW) - G11-23 (GSW3)	Always	Below 1 Ω
   G163-13 (GSW) - Body ground	Always	10 kΩ or higher

   W/ ADVANCED DRIVE SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   G164-13 (GSW) - G11-23 (GSW3)	Always	Below 1 Ω
   G164-13 (GSW) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR