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

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

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 ( see COMPONENT REPLACEMENT/INSPECTION AFTER DEPLOYMENT ).
Before doing this troubleshooting procedure, review SRS Precautions and Procedures (see PRECAUTIONS AND PROCEDURES ), General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION ), and 12 Volt Battery Terminal Disconnection and Reconnection (see 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 (see SRS UNIT UPDATE ) and retest.

Clear the DTC memory (see HOW TO CLEAR DTCS ).
Turn the ignition switch to ON (II), then wait for 10 seconds.
Read the DTC (see HOW TO RETRIEVE DTCS ).
Is DTC A2-1x indicated?

YES -Go to step 4.

NO -Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures (see TROUBLESHOOTING INTERMITTENT FAILURES ). If another DTC is indicated, troubleshoot the DTC.
Turn the ignition switch to LOCK (0).
Check the No. 6 (10 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?

YES -Go to step 6.

NO -Replace the fuse, then turn the ignition switch to ON (II). If the fuse blows again, check for a, short to ground in the dashboard wire harness or in the under-dash fuse/relay box No. 6 (10 A) fuse circuit; replace the dashboard wire harness. If the problem is still there, replace the under-dash fuse/relay box.
- USA models (see REMOVAL AND INSTALLATION )
- Canada models (see CANADA MODELS )
Turn the ignition switch to LOCK (0).
Do the 12 volt battery terminal disconnection procedure (see 12 VOLT BATTERY TERMINAL DISCONNECTION AND RECONNECTION ), then wait at least 3 minutes.
Disconnect SRS unit connector A (39P) from the SRS unit (see step 10 ).
Do the 12 volt battery terminal reconnection procedure (see 12 VOLT BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).
Turn the ignition switch to ON (II), then wait for 10 seconds.
Measure the voltage between SRS unit connector A (39P) terminal No. 27 and body ground. There should be battery voltage.

Fig 1: Measuring Voltage Between SRS Unit Connector A (39P) Terminal No. 27 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the voltage as specified?

YES -Faulty SRS unit or poor connection at SRS unit connector A (39P) and the SRS unit; check the connection. If the connection is OK, replace the SRS unit (see SRS UNIT REPLACEMENT ).

NO -Open in the dashboard wire harness; replace the dashboard wire harness, then clear the DTC.