DTC Troubleshooting: B0021-2B

DTC B0021-2B: Short to Another Wire Harness in the Left Side Curtain Airbag First Inflator

NOTE:

	Before doing this troubleshooting procedure, find out if the vehicle was in a collision. If so, verify that all the required components were replaced with new components of the correct part number and were properly installed.
	Before doing this troubleshooting procedure, review SRS Precautions and Procedures, General Troubleshooting Information, and 12 Volt Battery Terminal Disconnection and Reconnection.

DTC Description	DTC
B0021-2B Short to another wire harness in the left side curtain airbag first inflator

Problem verification:

Problem verification

?1.	Clear the DTCs with the HDS.

?2.	Turn the vehicle to the ON mode, then wait for 10 seconds.

?3.

Check for DTCs with the HDS.

DTC Description	DTC
B0021-2B Short to another wire harness in the left side curtain airbag first inflator

Is DTC B0021-2B indicated?


	YES

The failure is duplicated. Go to step 2.


	NO

Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.?

DTC check:

DTC check

?1.

Check for DTCs with the HDS.

DTC Description	DTC
B0001-2B Short to another wire harness in the driver's airbag first inflator
B0002-2B Short to another wire harness in the driver's airbag second inflator
B0010-2B Short to another wire harness in the front passenger's airbag first inflator
B0011-2B Short to another wire harness in the front passenger's airbag second inflator
B0020-2B Short to another wire harness in the left side airbag inflator
B0021-2B Short to another wire harness in the left side curtain airbag first inflator
B0028-2B Short to another wire harness in the right side airbag inflator
B0029-2B Short to another wire harness in the right side curtain airbag first inflator
B0070-2B Short to another wire harness in the driver's seat belt tensioner
B0072-2B Short to another wire harness in the front passenger's seat belt tensioner
B0079-2B Short to another wire harness in the driver's seat belt outer lap tensioner
B007A-2B Short to another wire harness in the front passenger's seat belt outer lap tensioner
B0082-2B Short to another wire harness in the selectable energy absorption device of the front passenger's seat belt tensioner

Is DTC B0001-2B, B0002-2B, B0010-2B, B0011-2B, B0020-2B, B0028-2B, B0029-2B, B0070-2B, B0072-2B, B0079-2B, B007A-2B or B0082-2B indicated with DTC B0021-2B?


	YES

Go to step 3.


	NO

Short to another wire in the floor wire harness; replace the floor wire harness, then clear the DTC.?

Shorted wire check (LCA lines to another line):

Shorted wire check (LCA lines to another line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

?3.	Remove the headliner.

?4.

Disconnect the following connectors.

SRS unit connector A (39P)

SRS unit connector B (39P)

Left side curtain airbag inflator 2P connector (on the floor wire harness)

Inflator connectors which are assigned to 2B codes listed on HDS

?5.

Check for continuity between test points 1 and 2 of SRS unit connector A (39P) and B (39P) according to table.

Test condition	Vehicle OFF (LOCK) mode
	SRS unit connector A (39P): disconnected
	SRS unit connector B (39P): disconnected
	Left side curtain airbag inflator 2P connector (on the floor wire harness): disconnected
	Inflator connectors which are assigned to 2B codes listed on HDS: disconnected

DTC	Test point 1	Test point 2
DTC	From terminal	To terminal
B0001-2B	SRS unit connector B (39P) No. 9	SRS unit connector A (39P) No. 9
B0001-2B	SRS unit connector B (39P) No. 10	SRS unit connector A (39P) No. 8
B0002-2B	SRS unit connector B (39P) No. 9	SRS unit connector A (39P) No. 10
B0002-2B	SRS unit connector B (39P) No. 10	SRS unit connector A (39P) No. 11
B0010-2B	SRS unit connector B (39P) No. 9	SRS unit connector A (39P) No. 5
B0010-2B	SRS unit connector B (39P) No. 10	SRS unit connector A (39P) No. 4
B0011-2B	SRS unit connector B (39P) No. 9	SRS unit connector A (39P) No. 6
B0011-2B	SRS unit connector B (39P) No. 10	SRS unit connector A (39P) No. 7
B0020-2B	SRS unit connector B (39P) No. 9	SRS unit connector B (39P) No. 5
B0020-2B	SRS unit connector B (39P) No. 10	SRS unit connector B (39P) No. 6
B0028-2B	SRS unit connector B (39P) No. 9	SRS unit connector B (39P) No. 4
B0028-2B	SRS unit connector B (39P) No. 10	SRS unit connector B (39P) No. 3
B0029-2B	SRS unit connector B (39P) No. 9	SRS unit connector B (39P) No. 8
B0029-2B	SRS unit connector B (39P) No. 10	SRS unit connector B (39P) No. 7
B0070-2B	SRS unit connector B (39P) No. 9	SRS unit connector B (39P) No. 20
B0070-2B	SRS unit connector B (39P) No. 10	SRS unit connector B (39P) No. 21
B0072-2B	SRS unit connector B (39P) No. 9	SRS unit connector B (39P) No. 19
B0072-2B	SRS unit connector B (39P) No. 10	SRS unit connector B (39P) No. 18
B0079-2B	SRS unit connector B (39P) No. 9	SRS unit connector B (39P) No. 24
B0079-2B	SRS unit connector B (39P) No. 10	SRS unit connector B (39P) No. 25
B007A-2B	SRS unit connector B (39P) No. 9	SRS unit connector B (39P) No. 23
B007A-2B	SRS unit connector B (39P) No. 10	SRS unit connector B (39P) No. 22
B0082-2B	SRS unit connector B (39P) No. 9	SRS unit connector A (39P) No. 2
B0082-2B	SRS unit connector B (39P) No. 10	SRS unit connector A (39P) No. 3

Is there continuity?


	YES

Short to another wire in the dashboard wire harness or the floor wire harness; replace the faulty harness, then clear the DTC.?


	NO

The LCA wires are OK. Faulty SRS unit or poor connection at SRS unit connector A (39P) and the SRS unit, or SRS unit connector B (39P) and the SRS unit. Check the connection; if the connection is OK, check for any authorized service information related to the DTCs or symptoms you are troubleshooting or replace the SRS unit. If the DTC does not clear, replace the dashboard wire harness or the floor wire harness.?