DTC B0004-13: Open or Increased Resistance in the Driver's Knee Airbag Inflator (2018-19)

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

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
   B0004-13 Open or increased resistance in the driver's knee airbag inflator

   Is DTC B0004-13 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. 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.

   DTC Description	DTC
   B0004-13 Open or increased resistance in the driver's knee airbag inflator

   Is DTC B0004-13 indicated?

   YES 

   Go to step 3.

   NO 

   Open in the driver's knee airbag inflator; replace the driver's knee airbag , then clear the DTC.

3. Open wire check (LKA+, LKA- lines)

   -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. Measure the resistance of the test point.

   Test condition	Vehicle OFF (LOCK) 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	SRS simulator lead L black terminal

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

   Is there 1.0 Ω 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 

   Open in the dashboard wire harness; replace the dashboard wire harness, then clear the DTC.