DTC Troubleshooting: B0021-11

DTC B0021-11: Short to Ground 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 that they were properly installed.
	Before doing this troubleshooting procedure, review SRS Precautions and Procedures, General Troubleshooting Information, and 12 Volt Battery Terminal Disconnection and Reconnection.
	Before replacing the SRS unit, check the SRS unit software version with the HDS. If the software version is not the latest, update the SRS unit software, and retest.

DTC Description	DTC
B0021-11 Short to ground 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
B0021-11 Short to ground in the left side curtain airbag first inflator

Is DTC B0021-11 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.?

Shorted wire check (LCA?, LCA? lines) 1:

Shorted wire check (LCA?, LCA? lines) 1

?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.

Disconnect the following connector.

SRS unit connector B (39P)

?4.

Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test condition	SRS unit connector B (39P): disconnected
Test point 1	SRS unit connector B (39P) No. 9
Test point 2	Body ground

Test point 1	SRS unit connector B (39P) No. 10
Test point 2	Body ground

Is there an open circuit, or at least 1 M??


	YES

The LCA? and LCA? wires are OK. Faulty SRS unit or poor connection at SRS unit connector B (39P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit. If the DTC does not clear, replace the left or right side wire harness.?


	NO

Go to step 3.

Shorted wire check (LCA?, LCA? lines) 2:

Shorted wire check (LCA?, LCA? lines) 2

?1.	Remove the headliner.

?2.

Disconnect the following connector.

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

?3.

Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	SRS unit connector B (39P): disconnected
	Left side curtain airbag inflator 2P connector (on the left side wire harness): disconnected
Test point 1	SRS unit connector B (39P) No. 9
Test point 2	Body ground

Test point 1	SRS unit connector B (39P) No. 10
Test point 2	Body ground

Is there an open circuit, or at least 1 M??


	YES

The LCA? and LCA? wires are OK. Faulty left side curtain airbag inflator; replace the left side curtain airbag, then clear the DTC.?


	NO

Short to ground in the left or right side wire harness; replace the faulty harness, then clear the DTC.?