What this code means
B0002 means the driver's airbag second inflator circuit may be open or have increased resistance.
An open circuit is a break in an electrical path. Increased resistance means the path has more resistance than the procedure allows. For B0002, the path under investigation belongs to the driver's airbag second inflator. The diagnosis therefore needs to separate a problem associated with that component from a problem elsewhere in its circuit.
The driver's airbag second inflator, its connecting paths and the SRS unit are different possible fault areas. Naming the driver's airbag second inflator in the code does not make those possibilities interchangeable. The steps below narrow the fault area by changing a defined test condition and then checking the individual paths.
What the vehicle may do
- The second inflator circuit may be open.
- The second inflator circuit may have increased resistance.
Possible fault areas
- The driver's airbag may have a problem.
- The cable reel may have a problem.
- The LA2+ or LA2- circuit may have a problem.
- The SRS unit may have a problem.
The procedure moves through confirmation, an indirect component check and electrical-path checks. In the indirect check, the specified jumper connection is used exactly as described. The result determines whether the component or other related parts remain involved. The later measurements examine LA2+ and LA2- through the cable reel and the wiring between the cable reel and SRS unit.
Read the result criteria alongside the action that produces them. During the component check, a normal circuit-test result can point to a problem with the named component. During a wire check, an abnormal reading instead points to the checked path. These conclusions belong to different stages of the diagnosis.
Diagnostic path
Understand the stored condition
B0002 means an open circuit or increased resistance in the driver's airbag second inflator.
Safety before starting
Follow the SRS safety precautions and the specified 12 volt battery terminal disconnection and reconnection procedure before these checks.
Check collision history first
Before you start these checks, find out whether the vehicle was in a collision. If it was, make sure all required components were replaced with new components. Check that those components have the correct part numbers and were properly installed.
Establish the confirmation condition
Turn the vehicle to ON mode, then wait for 10 seconds. This is the confirmation check.
Check the driver's airbag path
Before you disconnect an SRS related connector, disconnect the battery using 12 Volt Battery Terminal Disconnection and Reconnection. Wait for at least 3 minutes before disconnecting the connector. This check evaluates the component through its related components. Disconnect the driver's airbag second inflator connector (2P). Install a jumper wire between terminals No. 1 and No. 2 of that connector. Run the confirmation check: turn the vehicle to ON mode and wait for 10 seconds. For a normal result, DTC B0002-13 should not be indicated.
If the result is normal, there is a problem with the driver's airbag. If the result is abnormal, there is a problem with other related components.
For the component test, a normal result means the stated DTC B0002-13 is not indicated after the specified test connection and confirmation. The procedure associates that normal test result with a problem in the driver's airbag second inflator. An abnormal result follows the branch for other related components.
Here, the word normal refers to the response of the circuit test. It does not describe a direct resistance measurement of the driver's airbag second inflator. The wire checks that follow use their own resistance criteria and therefore answer a different question. This distinction is the key to reading the component and circuit branches correctly.
Check the cable reel LA2+ path
Check the cable reel's LA2+ path next. Before you disconnect an SRS related connector, follow the 12 volt battery terminal disconnection procedure. Wait for at least 3 minutes before disconnecting the connectors. Make sure the driver's airbag second inflator connector (2P) and cable reel connector B (4P) are both disconnected. With IG Mode OFF, place one probe on cable reel connector B (4P) male terminal 3.
- Other probe: driver's airbag second inflator connector (2P) female terminal 2.
This checks the LA2+ path for an open wire.
- Normal reading: less than 1 ohm.
That reading means this path passes the check.
The LA2 checks cover separate segments through the cable reel and between the reel and SRS unit. In the reel check, connector B terminal 3 pairs with the airbag connector terminal 2; reel terminal 4 pairs with airbag terminal 1. The later harness check uses SRS unit connector A terminal 4 to reel terminal 3, and SRS terminal 5 to reel terminal 4.
The shared path names therefore do not make these duplicate measurements. Each pair describes a different segment of the route to the second inflator. A normal reading through the reel describes that segment, while the SRS-to-reel readings describe the harness segment. The stated less-than-1-ohm criterion applies to each pair under its own preparation.
Check the cable reel LA2- path
Keep IG Mode OFF and both connectors disconnected.
- First probe: cable reel connector B (4P) male terminal 4.
- Other probe: driver's airbag second inflator connector (2P) female terminal 1.
This checks the LA2- path for an open wire.
- Normal reading: less than 1 ohm.
That reading means this path passes the check. If either cable reel reading is abnormal, there is a problem with the cable reel.
Check the LA2+ wiring
Check the LA2+ and LA2- wiring between the SRS unit and cable reel next. Before you disconnect an SRS related connector, follow the 12 volt battery terminal disconnection procedure. Wait for at least 3 minutes before disconnecting the connectors. Disconnect SRS unit connector A (43P). Make sure cable reel connector B (4P) is also disconnected. With IG Mode OFF, place one probe on SRS unit connector A (43P) female terminal 4.
- Other probe: cable reel connector B (4P) female terminal 3.
This checks the LA2+ circuit for an open wire.
- Normal reading: less than 1 ohm.
That reading means this circuit passes the check.
Check the LA2- wiring
Keep IG Mode OFF and both connectors disconnected.
- First probe: SRS unit connector A (43P) female terminal 5.
- Other probe: cable reel connector B (4P) female terminal 4.
This checks the LA2- circuit for an open wire.
- Normal reading: less than 1 ohm.
That reading means this circuit passes the check. If either wiring check is abnormal, there is a problem in the circuit.
When the other checks are normal
If all the other checks give normal results, the remaining cause is the SRS unit.
Final check
The fault may involve the driver's airbag, cable reel, connecting circuits, or SRS unit.
Taken together, the results form a chain. The indirect component check establishes which branch to follow; the individual electrical checks identify an abnormal path; and the final SRS-unit conclusion depends on the earlier inspection items being normal. Keep the actual result beside the component or wire that was being checked. That makes the final decision traceable to the procedure, rather than to the wording of the stored code alone.
