DTC B0021-13: Left Curtain Deployment Control 1 Circuit Open [11/2021 - 10/2023]: Procedure

Pre-procedure1

1. Turn the power switch on (IG), and wait for at least 60 seconds.

   Procedure1

2. Check for DTCs.

   Body Electrical > SRS Airbag > Trouble Codes 

   Post-procedure1

   Result

   Result	Proceed to
   B0021-13 is output	A
   History B0021-13 is output	B

3. None

Result: 

B 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023]

HINT: 

• To perform the simulation method, enter check mode (signal check) with the Techstream.

  Refer to CHECK MODE PROCEDURE [11/2021 - 10/2023]

• Perform the simulation method while checking the Data List.

  Refer to DATA LIST / ACTIVE TEST [11/2021 - 10/2023]

Result: 

A 

See step  2

Pre-procedure1

1. Turn the power switch off.
2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

   Procedure1

3. Check that the connectors are properly connected to the curtain shield airbag assembly LH and airbag ECU assembly.

   OK

   The connectors are properly connected.

   Post-procedure1

   Result

   Proceed to
   OK
   NG

4. None

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  3

Pre-procedure1

1. Disconnect the airbag ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Curtain Shield Airbag Assembly LH
   *2	Airbag ECU Assembly
   *3	Wire Harness

2. Disconnect the curtain shield airbag assembly LH connector.

   Procedure1

3. Check that the terminals of the connectors are not deformed or damaged.

   OK

   The terminals of the connectors are not deformed or damaged.

4. Check that the connectors are not loose, deformed or damaged.

   OK

   The connector locking button is not disengaged, and the claw of the lock is not deformed or damaged.

5. Check that the short springs of the activation prevention mechanisms of the wire harness connector are not deformed or damaged.

   OK

   The short springs are not deformed or damaged.

   Result

   Proceed to
   OK
   NG

   Post-procedure1

6. None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Connect the connector to the airbag ECU assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Curtain Shield Airbag Assembly LH
   *2	Airbag ECU Assembly
   *3	Wire Harness
   *4	SST
   *a	Front view of wire harness connector (to Curtain Shield Airbag Assembly LH)

2. Connect the white wire side of SST (resistance 2.1 Ω) to connector C.
   WARNING:

   Never connect a tester to the curtain shield airbag assembly LH for measurement, as this may lead to a serious injury due to airbag deployment.

   NOTE:

   • Do not forcibly insert SST into the terminals of the connector when connecting it.
   • Insert SST straight into the terminals of the connector.
   • SST: 09843-18061 
3. Connect the cable to the negative (-) auxiliary battery terminal.
4. Turn the power switch on (IG), and wait for at least 60 seconds.
5. Clear the DTCs stored in memory.

   Body Electrical > SRS Airbag > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

Pre-procedure1

1. Turn the power switch off.
2. Turn the power switch on (IG), and wait for at least 60 seconds.

   Procedure1

3. Check for DTCs.

   Body Electrical > SRS Airbag > Trouble Codes 

   Result

   Result	Proceed to
   B0021-13 is not output	A
   B0021-13 is output	B

   Post-procedure1

4. Turn the power switch off.
5. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
6. Disconnect SST from connector C.

Result: 

A 

REPLACE CURTAIN SHIELD AIRBAG ASSEMBLY LH. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

B 

See step  6

Pre-procedure1

1. Disconnect the L37 airbag ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Curtain Shield Airbag Assembly LH
   *2	Airbag ECU Assembly
   *3	Wire Harness
   *a	Front view of wire harness connector (to Curtain Shield Airbag Assembly LH)

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L69-1 (ICL+) - L69-2 (ICL-)	Always	Below 1 Ω

   Post-procedure1

   Result

   Proceed to
   OK
   NG

3. None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Connect the airbag ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Curtain Shield Airbag Assembly LH
   *2	Airbag ECU Assembly
   *3	Wire Harness

2. Connect the curtain shield airbag assembly LH connector.
3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
4. Turn the power switch on (IG), and wait for at least 60 seconds.
5. Clear the DTCs stored in memory.

   Body Electrical > SRS Airbag > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  8

Pre-procedure1

1. Turn the power switch off.
2. Turn the power switch on (IG), and wait for at least 60 seconds.

   Procedure1

3. Check for DTCs.

   Body Electrical > SRS Airbag > Trouble Codes 

   Result

   Result	Proceed to
   B0021-13 is not output	A
   B0021-13 is output	B

   Post-procedure1

4. None

Result: 

A 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023]

HINT: 

• To perform the simulation method, enter check mode (signal check) with the Techstream.

  Refer to CHECK MODE PROCEDURE [11/2021 - 10/2023]

• Perform the simulation method while checking the Data List.

  Refer to DATA LIST / ACTIVE TEST [11/2021 - 10/2023]

Result: 

B 

REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]