DTC B280A-87: No Signal From the Rear Safing Sensor

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 (2015-17) or SRS Component Replacement/Inspection After Deployment (2018-19) .
• Before doing this troubleshooting procedure, review SRS Precautions and Procedures , General Troubleshooting Information - Refer to: How to Troubleshoot the SRS (2015-17) or How to Troubleshoot the SRS (2018-19) , 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.

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

   - 3. Check for DTCs with the HDS.

   DTC Description	DTC
   B280A-87 No signal from the rear safing sensor

   Is DTC B280A-87 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 (2015-17) or How to Troubleshoot the SRS (2018-19) . If another DTC is indicated, troubleshoot the DTC.

2. Connector connection check

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

   - 2. Check the following connector connections.

   SRS unit connector B (39P)

   Rear safing sensor 2P connector (on the right side wire harness)

   Are the connectors OK?

   YES 

   Go to step 4.

   NO 

   Go to step 3.

3. System check

   -1. Repair the loose connector connections whichever was the cause of the problem in step 2.

   - 2. Clear the DTCs with the HDS.

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

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   B280A-87 No signal from the rear safing sensor

   Is DTC B280A-87 indicated?

   YES 

   Turn the vehicle to the OFF (LOCK) mode, then go to step 4.

   NO 

   The system is OK at this time.

4. Shorted wire check (SSS+ line to SSS- line)

   -1. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

   - 2. Disconnect the following connectors.

   SRS unit connector B (39P)

   Rear safing sensor 2P connector (on the right side wire harness)

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

   Test condition	Vehicle OFF (LOCK) mode
   	SRS unit connector B (39P): disconnected
   	Rear safing sensor 2P connector (on the right side wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 38 - Refer to: SRS Unit Connector for Inputs and Outputs (2015-17) or SRS Unit Connector for Inputs and Outputs (2018-19)
   Test point 2	SRS unit connector B (39P) No. 39 - Refer to: SRS Unit Connector for Inputs and Outputs (2015-17) or SRS Unit Connector for Inputs and Outputs (2018-19)

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

   YES 

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

   NO 

   Short to another wire in the right side wire harness; replace the right side wire harness, then clear the DTC.

5. Shorted wire check (SSS+ and SSS- lines)

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

   Test condition	Vehicle OFF (LOCK) mode
   	SRS unit connector B (39P): disconnected
   	Rear safing sensor 2P connector (on the right side wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 38 - Refer to: SRS Unit Connector for Inputs and Outputs (2015-17) or SRS Unit Connector for Inputs and Outputs (2018-19)
   Test point 2	Body ground

   Test point 1	SRS unit connector B (39P) No. 39 - Refer to: SRS Unit Connector for Inputs and Outputs (2015-17) or SRS Unit Connector for Inputs and Outputs (2018-19)
   Test point 2	Body ground

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

   YES 

   The SSS+ and SSS- wires are not shorted. Go to step 6.

   NO 

   Short to ground in the right side wire harness; replace the right side wire harness, then clear the DTC.

6. Shorted wire check (SSS+ and SSS- 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
   	Rear safing sensor 2P connector (on the right side wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 38 - Refer to: SRS Unit Connector for Inputs and Outputs (2015-17) or SRS Unit Connector for Inputs and Outputs (2018-19)
   Test point 2	Body ground

   Test point 1	SRS unit connector B (39P) No. 39 - Refer to: SRS Unit Connector for Inputs and Outputs (2015-17) or SRS Unit Connector for Inputs and Outputs (2018-19)
   Test point 2	Body ground

   Is there 0.2 V or less?

   YES 

   The SSS+ and SSS- wires are not shorted to power. Go to step 7.

   NO 

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

7. Open wire check (SSS+ and SSS- 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 rear safing sensor 2P connector (B) on the right 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
   	Rear safing sensor 2P connector (on the right side wire harness): disconnected
   	Rear safing sensor 2P connector (on the right side wire harness): connected to SRS simulator lead L
   Test point 1	SRS unit connector B (39P) No. 38 - Refer to: SRS Unit Connector for Inputs and Outputs (2015-17) or SRS Unit Connector for Inputs and Outputs (2018-19)
   Test point 2	SRS unit connector B (39P) No. 39 - Refer to: SRS Unit Connector for Inputs and Outputs (2015-17) or SRS Unit Connector for Inputs and Outputs (2018-19)

   Is there 1.0 Ω or less?

   YES 

   The SSS+ and SSS- wires are OK. Replace the rear safing sensor - Refer to: Rear Safing Sensor Removal and Installation (With SH-AWD) or Rear Safing Sensor Removal and Installation (Without SH-AWD) , then clear the DTC, and retest. If the DTC is still present, replace the SRS unit - Refer to: SRS Unit Removal and Installation (2015-17) or SRS Unit Removal and Installation (2018-19) .

   NO 

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