What this code means
B0002 may indicate that the SRS unit is seeing a possible problem in the driver airbag inflator circuit.
What the vehicle may do
- The SRS warning light may stay on while the fault is active.
- The airbag system may limit normal supplemental restraint operation when this kind of fault is present.
Possible fault areas
- A possible driver airbag inflator circuit concern.
- A possible cable reel concern.
- A possible dashboard harness open or connection issue.
- A possible SRS unit connector or SRS unit concern.
Diagnostic path
Open and set the boundary
On this 2010 to 2016 Honda CR-V, B0002 is an SRS fault that may point to an open or connection problem in the driver airbag inflator circuit. The driver may only notice the SRS warning light, and the system may limit airbag operation while the fault is active. Broadly, this can involve the driver airbag inflator, the cable reel, the dashboard harness, or the SRS unit and its connector. Before touching the circuit, confirm whether the vehicle was in a collision. If it was, make sure the required SRS parts were replaced with correct new parts and installed properly. Also follow normal airbag handling precautions and the correct 12 volt battery disconnect and reconnect process.
First, duplicate the fault
Start by clearing the DTCs with the HDS. Turn the vehicle to the ON mode, wait for 10 seconds, then check codes again with the HDS. If B0002 comes right back, the failure is duplicated and you move into circuit isolation. If B0002 does not return, treat it as an intermittent at this time. If a different code is present, check what that code means first instead of forcing this path.
Isolate the driver airbag inflator
With the fault duplicated, turn the vehicle to OFF LOCK. Disconnect the negative cable from the 12 volt battery and wait at least 3 minutes. Remove the access panel from the steering wheel, then disconnect the driver airbag inflator 4P connector on the cable reel harness. Connect the terminals of SRS simulator lead J to the SRS inflator simulator using the 2 Ω connectors, then connect simulator lead J to the driver airbag inflator 4P connector on the cable reel harness. Reconnect the negative battery cable, clear the DTCs with the HDS, turn the vehicle to ON mode, wait for 10 seconds, and check again. If B0002 is no longer indicated, the path calls that an open in the driver airbag first inflator: replace the driver airbag, then clear the DTC. If B0002 is still indicated, keep moving downstream to the cable reel check.
Check whether the cable reel is the open point
Turn the vehicle back to OFF LOCK. Disconnect the negative cable from the 12 volt battery and wait at least 3 minutes. Remove the column covers, then disconnect cable reel connector B, the 4P connector, on the dashboard wire harness. Connect the terminals of SRS simulator lead J to the SRS inflator simulator with the 2 Ω connectors, then connect simulator lead J to cable reel connector B on the dashboard wire harness. Reconnect the negative battery cable, clear the DTCs with the HDS, turn the vehicle to ON mode, wait for 10 seconds, and recheck. If B0002 is no longer indicated, the open is in the cable reel: replace the cable reel, then clear the DTC. If B0002 is still indicated, the cable reel did not isolate it, so continue to the harness resistance check.
Check the LA lines for an open
For the open-wire check, turn the vehicle to OFF LOCK again. Disconnect the negative cable from the 12 volt battery and wait at least 3 minutes. Disconnect SRS unit connector A, the 39P connector. Now disconnect the SRS inflator simulator from SRS simulator lead J, but do not disconnect simulator lead J from cable reel connector B on the dashboard wire harness. With the driver airbag inflator connector disconnected, cable reel connector B disconnected from the cable reel side, SRS unit connector A disconnected, and simulator lead J still connected at cable reel connector B on the dashboard harness, measure resistance between the black terminal and red terminal of SRS simulator lead J. The decision point is 1.0 Ω or less.
Use the resistance result
If the measurement is 1.0 Ω or less, the LA1＋, LA1－, LA2＋, and LA2－ lines are considered OK. At that point, look at the SRS unit side: a poor connection at SRS unit connector A or the SRS unit itself is the next concern. Before replacing the SRS unit, check its software version with the HDS. If it is not the latest version, update the SRS unit software and retest. If the connector connection is OK and the path still points at the unit, replace the SRS unit. If the DTC still does not clear after that, replace the dashboard wire harness. If the resistance is not 1.0 Ω or less, the path calls an open in the dashboard wire harness: replace the dashboard wire harness, then clear the DTC.
Verify the result
Keep verification separate from the isolation tests. After the indicated repair, clear the DTCs with the HDS, turn the vehicle to ON mode, wait for 10 seconds, and confirm B0002 stays gone. The key is to let the simulator tests divide the circuit cleanly: airbag first, cable reel second, harness and SRS unit side last. For more diagnostic training, visit stepdiagnostics.com.
Final check
This diagnosis often comes down to isolating the driver airbag circuit with the proper simulator setup, then using the resistance result to separate the harness from the SRS unit side.
For more guided automotive diagnostics, visit STEP Diagnostics.
