DTC B0004-12: Short to Power in the Driver's Knee Airbag Inflator (2015-17)

Special Tools Required: 

SRS Inflator Simulator 07SAZ-TB4011A 

SRS Simulator Lead L 070AZ-SNAA300 

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 - Refer to: SRS Component Replacement/Inspection After Deployment .
• Review SRS Precautions and Procedures .
• Review General Troubleshooting Information
• Review information pertaining to 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.

   - 2. Turn the vehicle to the ON mode, then wait for 10 seconds.

   - 3. Check for DTCs with the HDS.

   DTC Description	DTC
   B0004-12 Short to power in the driver's knee airbag inflator

   Is DTC B0004-12 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 - Refer to: How to Troubleshoot the SRS . If another DTC is indicated, troubleshoot the DTC.

2. Driver's knee airbag inflator check

   -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 driver's outer dashboard lower cover.

   - 4. Remove the driver's inner dashboard lower cover.

   - 5. Disconnect the driver's knee airbag inflator 2P connector (A) on the dashboard wire harness.

   Courtesy of HONDA, U.S.A., INC.

   - 6. Connect the terminals of SRS simulator lead L to the SRS inflator simulator (2 Ω connectors), then connect SRS simulator lead L to the driver's knee airbag inflator 2P connector on the dashboard wire harness.

   - 7. Reconnect the negative cable to the 12 volt battery.

   - 8. Clear the DTCs with the HDS.

   - 9. Turn the vehicle to the ON mode, then wait for 10 seconds.

   - 10.Check for DTCs with the HDS - Refer to: How to Troubleshoot the SRS .

   DTC Description	DTC
   B0004-12 Short to power in the driver's knee airbag inflator

   Is DTC B0004-12 indicated?

   YES 

   Go to step 3.

   NO 

   Short to power in the driver's knee airbag inflator; replace the driver's knee airbag , then clear the DTC.

3. Shorted wire check (LKA+, LKA- lines to power)

   -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 A (39P)

   - 4. Disconnect the SRS inflator simulator from SRS simulator lead L. Do not disconnect SRS simulator lead L from the driver's knee airbag inflator 2P connector on the dashboard 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.

   Test condition	Vehicle ON mode
   	Driver's knee airbag inflator 2P connector (on the dashboard wire harness): disconnected
   	SRS unit connector A (39P): disconnected
   	Driver's knee airbag inflator 2P connector (on the dashboard wire harness): connected to SRS simulator lead L
   Test point 1	SRS simulator lead L black terminal
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there 0.2 V or less?

   YES 

   The LKA+ and LKA- wires are OK. 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 - Refer to: SRS Unit Removal and Installation . If the DTC does not clear, replace the dashboard wire harness.

   NO 

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