DTC B280A-87 (2017 2018 2019 2020)

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

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 were properly installed .
• Before doing this troubleshooting procedure, review SRS Precautions and Procedures , General Troubleshooting Information , and Battery Terminal Disconnection and Reconnection. - Refer to: 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
   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. 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 floor wire harness)

   Are the connectors OK?

   YES 

   Go to step 4.

   NO 

   Go to step 3.

3. System check

   -1. Reset the loose 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 battery, then wait at least 3 minutes.

   - 2. Disconnect the following connectors:

   SRS unit connector B (39P)

   Rear safing sensor 2P connector (on the floor 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 floor wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 34 - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020),
   Test point 2	SRS unit connector B (39P) No. 35 - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020)

   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 floor wire harness; replace the floor wire harness, then clear the DTC.

5. Shorted wire check (SSS+, 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 floor wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 34 - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020),
   Test point 2	Body ground

   Test point 1	SRS unit connector B (39P) No. 35 - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020)
   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 floor wire harness; replace the floor wire harness, then clear the DTC.

6. Shorted wire check (SSS+, SSS- lines to power)

   -1. Reconnect the negative cable to the 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 floor wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 34 - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020)
   Test point 2	Body ground

   Test point 1	SRS unit connector B (39P) No. 35 - Refer to: SRS Unit Connector for Inputs and Outputs (2016)
   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 floor wire harness; replace the floor wire harness, then clear the DTC.

7. Open wire check (SSS+, SSS- lines)

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

   - 2. Connect terminals A and B with a jumper wire.

   Terminal A	Rear safing sensor 2P connector (female terminals) No. 1 (on the floor wire harness):
   Terminal B	Rear safing sensor 2P connector (female terminals) No. 2 (on the floor 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 floor wire harness): disconnected
   	Rear safing sensor 2P connector terminals No. 1 and No. 2 (on the floor wire harness): jumped
   Test point 1	SRS unit connector B (39P) No. 34 - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020)
   Test point 2	SRS unit connector B (39P) No. 35 - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020),

   Is there 1.0 Ω or less?

   YES 

   The SSS+ and SSS- wires are OK. Replace the rear safing sensor , then clear the DTC and retest. If the DTC is still present, check for any authorized service information related to the DTCs or symptoms you are troubleshooting or replace the SRS unit - Refer to: SRS Unit Removal and Installation (2017 2018 2019 2020), .

   NO 

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