DTC A2-1x

DTC A2-1x ("x" can be 0 thru 9 or A thru F): Faulty Power Supply (VB line)

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures and General Troubleshooting Information.

1. Check the No.2 (10 A) fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?

YES - Go to step 2.

NO - Replace the fuse, then turn the ignition switch ON (II). If the fuse blows again, check for a short to ground in the driver's under-dash fuse/relay box No.2 (10 A) fuse line, in dashboard wire harness A, or in the SRS subharness; replace the driver's under-dash fuse/relay box.

2. Turn the ignition switch OFF. Disconnect the negative cable from the battery.
3. Disconnect SRS unit connector A (28P) from the SRS unit.
4. Reconnect the negative cable to the battery.
5. Connect a voltmeter between the No.18 terminal of SRS unit connector A (28P) and body ground. Turn the ignition switch ON (II), and measure the voltage. There should be battery voltage.






Is there battery voltage?

YES - Faulty SRS unit or poor connection at SRS unit connector A (28P) and the SRS unit; check the connection. If the connection is OK, replace the SRS unit.

NO - Go to step 6.

6. Turn the ignition switch OFF.
7. Disconnect driver's under-dash fuse/relay box connector B (2P).






8. Measure the resistance between the No.2 terminal of driver's under-dash fuse/relay box connector B (2P) and the No.18 terminal of SRS unit connector A (28P). There should be less than 1.0 ohm.






Is the resistance as specified?

YES - Open in the driver's under-dash fuse/relay box or poor connection at driver's under-dash fuse/relay box connector B (2P) and the driver's under-dash fuse/relay box; check the connection. If the connection is OK, replace the driver's under-dash fuse/relay box.

NO - Go to step 9.

9. Disconnect dashboard wire harness A 28P connector C821 (A) from SRS subharness connector C821 (B).






10. Measure the resistance between the No.2 terminal of driver's under-dash fuse/relay box connector B (2P) and the No.27 terminal of dashboard wire harness A 28P connector C821. There should be less than 1.0 ohm.






Is the resistance as specified?

YES - Open in the SRS subharness; replace the SRS subharness.

NO - Open in dashboard wire harness A; replace dashboard wire harness A.