DTC Troubleshooting: B0020-1A

DTC B0020-1A: Decreased Resistance in the Driver's Side Airbag Inflator

Special Tools Required

?SRS Inflator Simulator 07SAZ-TB4011A

?SRS Simulator Lead L 070AZ-SNAA300

?SRS Short Canceller 070AZ-SAA0100

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
B0020-1A Decreased resistance in the driver's side airbag 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
B0020-1A Decreased resistance in the driver's side airbag inflator

Is DTC B0020-1A 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.?

Driver's side airbag inflator check:

Driver's side airbag inflator check

?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 driver's side airbag inflator 2P connector (A) on the floor wire harness.

?4.	Connect the terminals of SRS simulator lead L to the SRS inflator simulator (2 ? connectors), then connect SRS simulator lead L to the driver's side airbag inflator 2P connector on the floor wire harness.

?5.	Reconnect the negative cable to the 12 volt battery.

?6.	Clear the DTCs with the HDS.

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

?8.

Check for DTCs with the HDS.

DTC Description	DTC
B0020-1A Decreased resistance in the driver's side airbag inflator

Is DTC B0020-1A indicated?


	YES

Go to step 3.


	NO

Short to another wire in the driver's side airbag inflator; replace the driver's side airbag, then clear the DTC.?

Shorted wire check (LSA? line to LSA? line):

Shorted wire check (LSA? line to LSA? 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.

Disconnect the following connector.

SRS unit connector B (39P)

?4.	Disconnect the SRS inflator simulator from SRS simulator lead L. Do not disconnect SRS simulator lead L from the driver's side airbag inflator 2P connector on the floor wire harness.

?5.	Connect the SRS short canceller to SRS unit connector B (39P) terminals No. 5 and No. 6.

?6.

Measure the resistance of the test point.

Test condition	Vehicle OFF (LOCK) mode
	Driver's side airbag inflator 2P connector (on the floor wire harness): disconnected
	SRS unit connector B (39P): disconnected
	Driver's side airbag inflator 2P connector (on the floor wire harness): connected to SRS simulator lead L
	SRS unit connector B (39P) No. 5 and No. 6: connected to SRS short canceller
Test point	SRS simulator lead L black terminal

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


	YES

The LSA? and LSA? 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

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