DTC B00A0-87

DTC B00A0-87  : Lost Communication With the Front Passenger's Weight Sensor Unit

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 .
• 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 (2014 2015), or Battery Terminal Disconnection and Reconnection (2016 2017 2018 2019 2020) .
• 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.
• Before replacing the front passenger's weight sensor unit, check the front passenger's weight sensor unit software version with the HDS. If the software version is not the latest, update the front passenger's weight sensor unit software , and retest.

DTC (SRS)

1. Problem verification

   -1. Make sure nothing is on the front passenger's seat.

   - 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
   B00A0-87 Lost communication with the front passenger's weight sensor unit

   Is DTC B00A0-87 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. Fuse check 1

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

   - 2. Check the following fuse.

   Fuse	No. E24 (7.5 A)
   Location	Passenger's under-dash fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Replace the fuse, then turn the vehicle to the ON mode. If the fuse blows again, check for a short to ground in the passenger's under-dash fuse/relay box No. E24 (7.5 A) fuse circuit (dashboard wire harness, floor wire harness, or front passenger's seat wire harness); replace the faulty harness, then clear the DTC, and retest. If the DTC is still present, replace the passenger's under-dash fuse/relay box - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation, or Passenger's Under-Dash Fuse/Relay Box Removal and Installation , then clear the DTC.

3. Fuse check 2

   -1. Check the following fuse.

   Fuse	No. D12 (20 A)
   Location	Driver's under-dash fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 4.

   NO 

   Replace the fuse, then turn the vehicle to the ON mode. If the fuse blows again, check for a short to ground in the driver's under-dash fuse/relay box No. D12 (20 A) fuse circuit (dashboard wire harness); replace the dashboard wire harness, then clear the DTC, and retest. If the DTC is still present, replace the driver's under-dash fuse/relay box - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation, or Passenger's Under-Dash Fuse/Relay Box Removal and Installation , then clear the DTC.

4. Connector connection check 1

   -1. From under the front passenger's seat, check the connection of the connector (A) between the floor wire harness and the front passenger's seat wire harness.

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

   Is the connector OK?

   YES 

   Go to step 6.

   NO 

   Go to step 5.

5. System check 1

   -1. Repair the poor connector connection which was the cause of the problem in step 4.

   - 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
   B00A0-87 Lost communication with the front passenger's weight sensor unit

   Is DTC B00A0-87 indicated?

   YES 

   Turn the vehicle to the OFF (LOCK) mode, then go to step 6.

   NO 

   The system is OK at this time.

6. Connector connection check 2

   -1. Check the connection between the front passenger's weight sensor unit connector A (6P) and the front passenger's weight sensor unit.

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

   Is the connector OK?

   YES 

   Go to step 8.

   NO 

   Go to step 7.

7. System check 2

   -1. Repair the poor connector connection which was the cause of the problem in step 6.

   - 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
   B00A0-87 Lost communication with the front passenger's weight sensor unit

   Is DTC B00A0-87 indicated?

   YES 

   Turn the vehicle to the OFF (LOCK) mode, then go to step 8.

   NO 

   The system is OK at this time.

8. Open wire check (POW line)

   -1. Disconnect the following connector.

   Front passenger's weight sensor unit connector A (6P)

   - 2. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	Front passenger's weight sensor unit connector A (6P): disconnected
   Test circuit	POW
   Test point 1	Front passenger's weight sensor unit connector A (6P) No. 3 (YEL)
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The POW wire is OK. Go to step 9.

   NO 

   Open in the dashboard wire harness, the floor wire harness, the front passenger's seat wire harness, or faulty passenger's under-dash fuse/relay box; replace the faulty harness or the passenger's under-dash fuse/relay box - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation, or Passenger's Under-Dash Fuse/Relay Box Removal and Installation , then clear the DTC.

9. Open wire check (GND/SGND line)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Front passenger's weight sensor unit connector A (6P): disconnected
   Test circuit	GND
   Test point 1	Front passenger's weight sensor unit connector A (6P) No. 1 (BLK)
   Test point 2	Body ground

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

   Is there 1.0 Ω or less?

   YES 

   The GND/SGND wire is OK. Go to step 10.

   NO 

   Open in the floor wire harness or the front passenger's seat wire harness; check for a poor ground at G604. If the ground is OK, replace the faulty harness, then clear the DTC.

10. Shorted wire check (OPDS/ODUS line)

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

    - 2. Disconnect the following connector.

    SRS unit connector B (39P) - Refer to: SRS Unit Removal and Installation,

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

    Test condition	Vehicle OFF (LOCK) mode
    	Front passenger's weight sensor unit connector A (6P): disconnected
    	SRS unit connector B (39P): disconnected
    Test circuit	OPDS
    Test point 1	SRS unit connector B (39P) No. 11
    Test point 2	Body ground

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

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

    YES 

    The OPDS/ODUS wire is not shorted. Go to step 11.

    NO 

    Short to ground in the floor wire harness or the front passenger's seat wire harness; replace the faulty harness, then clear the DTC.

11. Shorted wire check (OPDS/ODUS line 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
    	Front passenger's weight sensor unit connector A (6P): disconnected
    	SRS unit connector B (39P): disconnected
    Test circuit	OPDS
    Test point 1	SRS unit connector B (39P) No. 11
    Test point 2	Body ground

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

    Is there 0.2 V or less?

    YES 

    The OPDS/ODUS wire is not shorted to power. Go to step 12.

    NO 

    Short to power in the floor wire harness or the front passenger's seat wire harness; replace the faulty harness, then clear the DTC.

12. Open wire check (OPDS/ODUS line)

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

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

    Test condition	Vehicle OFF (LOCK) mode
    	Front passenger's weight sensor unit connector A (6P): disconnected
    	SRS unit connector B (39P): disconnected
    Test circuit	OPDS/ODUS
    Test point 1	SRS unit connector B (39P) No. 11
    Test point 2	Front passenger's weight sensor unit connector A (6P) No. 4 (LT GRN)

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

    Is there 1.0 Ω or less?

    YES 

    The OPDS/ODUS wire is OK. Replace the front passenger's weight sensor unit , 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 harness between SRS unit connector B (39P) terminal No. 11 and front passenger's weight sensor unit connector A (6P) terminal No. 4 (floor wire harness or front passenger's seat wire harness); replace the faulty harness, then clear the DTC.