Honda HR-V: DTC B0021-12

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 (SRS)

1. Problem verification:

1. Clear the DTCs with the HDS.

Clear DTCs

2. Turn the vehicle to the ON mode, then wait for 10 seconds.
3. Check for DTCs with the HDS.

Is DTC B0021-12 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.

2. Shorted wire check (LCA+, LCA- lines to power) 1:

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. Reconnect the negative cable to the 12 volt battery.
5. Turn the vehicle to the ON mode.
6. Measure the voltage between test points 1 and 2.

Is there 0.2 V or less?

YES

The LCA+ and LCA- wires are OK. Replace the SRS unit.

NO

Go to step 3.

3. Shorted wire check (LCA+, LCA- lines to power) 2:

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. Remove the headliner.
4. Disconnect the following connector.

Left side curtain airbag inflator 2P connector (on the floor wire harness)

5. Reconnect the negative cable to the 12 volt battery.
6. Turn the vehicle to the ON mode.
7. Measure the voltage between test points 1 and 2.

Is there 0.2 V or less?

YES

The LCA+ and LCA- wires are OK. Faulty left side curtain airbag inflator; replace the left side curtain airbag, then clear the DTC.

NO

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

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