DTC B0021-11: Short to Ground in the Left Side Curtain Airbag 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.

• 1. 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 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.

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

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

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

  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 floor wire harness.

  NO 

  Go to step 3.

• 3. 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 floor 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 floor wire harness): disconnected
  Test point 1	SRS unit connector B (39P) No. 1
  Test point 2	Body ground

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

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

  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 floor wire harness; replace the floor wire harness, then clear the DTC.