DTC B0091-87: No Signal From the Left Side Impact Sensor (first) (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. DTC check

   -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
   B0091-87 No signal from the left side impact sensor (first)
   B0092-87 No signal from the left side impact sensor (second)

   Are DTCs indicated?

   Only DTC B0091-87

   Go to step 2.

   DTC B0091-87 and B0092-87

   Replace the left side impact sensor (first) (Refer to: Side Impact Sensor (First) Removal and Installation ), then clear the DTC.

   NO DTC

   The system is OK at this time.

2. Shorted wire check (LS1+ line to LS1- line)

   -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 connectors.

   SRS unit connector B (39P)

   Left side impact sensor (first) 4P connector (on the left side wire harness)

   - 4. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	SRS unit connector B (39P): disconnected
   	Left side impact sensor (first) 4P connector (on the left side wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 28 - Refer to: SRS Unit Connector for Inputs and Outputs
   Test point 2	SRS unit connector B (39P) No. 29 - Refer to: SRS Unit Connector for Inputs and Outputs

   Is there an open circuit, or at least 1 MΩ?

   YES 

   The LS1+ and LS1- wires are not shorted. Go to step 3.

   NO 

   Short to another wire in the left or right side wire harness between the SRS unit and the left side impact sensor (first); replace the faulty harness, then clear the DTC.

3. Shorted wire check (LS1+, LS1- lines)

   -1. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	SRS unit connector B (39P): disconnected
   	Left side impact sensor (first) 4P connector (on the left side wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 28 - Refer to: SRS Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Test point 1	SRS unit connector B (39P) No. 29 - Refer to: SRS Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Is there an open circuit, or at least 1 MΩ?

   YES 

   The LS1+ and LS1- wires are not shorted. Go to step 4.

   NO 

   Short to ground in the left or right side wire harness between the SRS unit and the left side impact sensor (first); replace the faulty harness, then clear the DTC.

4. Shorted wire check (LS1+, LS1- lines to power)

   -1. Reconnect the negative cable to the 12 volt battery.

   - 2. Turn the vehicle to the ON mode.

   - 3. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	SRS unit connector B (39P): disconnected
   	Left side impact sensor (first) 4P connector (on the left side wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 28 - Refer to: SRS Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Test point 1	SRS unit connector B (39P) No. 29 - Refer to: SRS Unit Connector for Inputs and Outputs
   Test point 2	Body ground

   Is there 0.2 V or less?

   YES 

   The LS1+ and LS1- wires are not shorted to power. Go to step 5.

   NO 

   Short to power in the left or right side wire harness between the SRS unit and the left side impact sensor (first); replace the faulty harness, then clear the DTC.

5. Open wire check (LS1+, LS1- lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Connect the black terminal (A) of SRS simulator lead L to the SRS inflator simulator (jumper connector), then connect SRS simulator lead L to the left side impact sensor (first) 4P connector (B) on the left side wire harness.

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

   - 3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	SRS unit connector B (39P): disconnected
   	Left side impact sensor (first) 4P connector (on the left side wire harness): disconnected
   	Left side impact sensor (first) 4P connector (on the left side wire harness): connected to SRS simulator lead L
   Test point 1	SRS unit connector B (39P) No. 28 - Refer to: SRS Unit Connector for Inputs and Outputs
   Test point 2	SRS unit connector B (39P) No. 29 - Refer to: SRS Unit Connector for Inputs and Outputs

   Is there 1.0 Ω or less?

   YES 

   The LS1+ and LS1- wires are OK. Replace the left side impact sensor (first) (Refer to: Side Impact Sensor (First) Removal and Installation ), then clear the DTC, and retest. If the DTC is still present, replace the SRS unit - Refer to: SRS Unit Removal and Installation .

   NO 

   Open in the left or right side wire harness between the SRS unit and the left side impact sensor (first); replace the faulty harness, then clear the DTC.