DTC B0091-87, B0092-87

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

DTC B0092-87  : No Signal From the Left Side Impact Sensor (second)

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 12 Volt Battery Terminal Disconnection and Reconnection .

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
   B0091-4A Internal failure of the left side impact sensor (first)
   B0091-87 No signal from the left side impact sensor (first)
   B0091-92 Internal failure of the left side impact sensor (first)
   B0092-4A Internal failure of the left side impact sensor (second)
   B0092-87 No signal from the left side impact sensor (second)
   B0092-92 Internal failure of the left side impact sensor (second)

   Are DTCs indicated?

   DTC B0091-87

   Go to step 2.

   DTC B0092-87

   Go to step 10.

   DTC B0091-4A or B0091-92

   Replace the left side impact sensor (first) , then clear the DTC.

   DTC B0092-4A or B0092-92

   Replace the left side impact sensor (second) , then clear the DTC.

   NO DTC

   Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.

2. Harness visual check

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

   -2. Check for damage on the floor wire harness that side impact sensor is connected to.

   Is the floor wire harness OK?

   YES 

   Go to step 3.

   NO 

   Replace the floor wire harness, then clear the DTC, and retest.

3. Connector connection check

   -1. Check the following connections.

   SRS unit connector B (39P)

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

   Left side impact sensor (second) 2P connector (on the floor wire harness)

   Are the connectors OK?

   YES 

   Go to step 5.

   NO 

   Go to step 4.

4. System check

   -1. Reset the loose connections that caused the problem in step 3.

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

   Is DTC B0091-87 indicated?

   YES 

   Turn the vehicle to the OFF (LOCK) mode, then go to step 5.

   NO 

   The system is OK at this time.

5. Left side impact sensor (first) substituting

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

   -2. Substitute a known-good left side impact sensor (first) .

   -3. Reconnect the negative cable to the 12 volt battery.

   -4. Clear the DTCs with the HDS.

   -5. Turn the vehicle to the ON mode, then wait for 10 seconds.

   -6. Check for DTCs with the HDS.

   DTC Description	DTC
   B0091-87 No signal from the left side impact sensor (first)

   Is DTC B0091-87 indicated?

   YES 

   Go to step 6.

   NO 

   Replace the left side impact sensor (first) , then clear the DTC.

6. 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. Return the left side impact sensor (first) which was replaced.

   -4. Disconnect the following connectors.

   SRS unit connector B (39P)

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

   Left side impact sensor (second) 2P connector (on the floor wire harness)

   -5. 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 floor wire harness): disconnected
   	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
   Test point 1	Left side impact sensor (first) 4P connector (female terminals) No. 2 (on the floor wire harness):
   Test point 2	Left side impact sensor (first) 4P connector (female terminals) No. 3 (on the floor wire harness):

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

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

   YES 

   The LS1+ and LS1- wires are not shorted. Go to step 7.

   NO 

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

7. 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 floor wire harness): disconnected
   	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
   Test point 1	Left side impact sensor (first) 4P connector (female terminals) No. 2 (on the floor wire harness):
   Test point 2	Body ground

   Test point 1	Left side impact sensor (first) 4P connector (female terminals) No. 3 (on the floor wire harness):
   Test point 2	Body ground

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

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

   YES 

   The LS1+ and LS1- wires are not shorted. Go to step 8.

   NO 

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

8. 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 floor wire harness): disconnected
   	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
   Test point 1	Left side impact sensor (first) 4P connector (female terminals) No. 2 (on the floor wire harness):
   Test point 2	Body ground

   Test point 1	Left side impact sensor (first) 4P connector (female terminals) No. 3 (on the floor wire harness):
   Test point 2	Body ground

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

   Is there 0.2 V or less?

   YES 

   The LS1+ and LS1- wires are not shorted to power. Go to step 9.

   NO 

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

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

   -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
   	SRS unit connector B (39P): disconnected
   	Left side impact sensor (first) 4P connector (on the floor wire harness): disconnected
   	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
   Test point 1	SRS unit connector B (39P) No. 38
   Test point 2	Left side impact sensor (first) 4P connector (female terminals) No. 3 (on the floor wire harness):

   Test point 1	SRS unit connector B (39P) No. 39
   Test point 2	Left side impact sensor (first) 4P connector (female terminals) No. 2 (on the floor wire harness):

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

   Is there 1.0 Ω or less?

   YES 

   The LS1+ and LS1- wires are OK. Disconnect and reconnect the connector, and then check the DTC again. 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 .

   NO 

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

10. Harness visual check

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

    -2. Check for damage on the floor wire harness that side impact sensor is connected to.

    Is the floor wire harness OK?

    YES 

    Go to step 11.

    NO 

    Replace the floor wire harness, then clear the DTC, and retest.

11. Connector connection check

    -1. Check the following connections.

    SRS unit connector B (39P)

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

    Left side impact sensor (second) 2P connector (on the floor wire harness)

    Are the connectors OK?

    YES 

    Go to step 13.

    NO 

    Go to step 12.

12. System check

    -1. Reset the loose connections that caused the problem in step 11.

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

    Is DTC B0092-87 indicated?

    YES 

    Turn the vehicle to the OFF (LOCK) mode, then go to step 13.

    NO 

    The system is OK at this time.

13. Left side impact sensor (second) substituting

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

    -2. Substitute a known-good left side impact sensor (second) .

    -3. Reconnect the negative cable to the 12 volt battery.

    -4. Clear the DTCs with the HDS.

    -5. Turn the vehicle to the ON mode, then wait for 10 seconds.

    -6. Check for DTCs with the HDS.

    DTC Description	DTC
    B0092-87 No signal from the left side impact sensor (second)

    Is DTC B0092-87 indicated?

    YES 

    Go to step 14.

    NO 

    Replace the left side impact sensor (second) , then clear the DTC.

14. Left side impact sensor (first) substituting

    -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. Return the left side impact sensor (second) which was replaced.

    -4. Substitute a known-good left side impact sensor (first) .

    -5. Reconnect the negative cable to the 12 volt battery.

    -6. Clear the DTCs with the HDS.

    -7. Turn the vehicle to the ON mode, then wait for 10 seconds.

    -8. Check for DTCs with the HDS.

    DTC Description	DTC
    B0092-87 No signal from the left side impact sensor (second)

    Is DTC B0092-87 indicated?

    YES 

    Go to step 15.

    NO 

    Replace the left side impact sensor (first) , then clear the DTC.

15. Shorted wire check (LS2+ line to LS2- 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. Return the left side impact sensor (first) which was replaced.

    -4. Disconnect the following connectors.

    SRS unit connector B (39P)

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

    Left side impact sensor (second) 2P connector (on the floor wire harness)

    -5. 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 floor wire harness): disconnected
    	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
    Test point 1	Left side impact sensor (second) 2P connector (female terminals) No. 1 (on the floor wire harness):
    Test point 2	Left side impact sensor (second) 2P connector (female terminals) No. 2 (on the floor wire harness):

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

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

    YES 

    The LS2+ and LS2- wires are not shorted. Go to step 16.

    NO 

    Short to another wire in the floor wire harness between the left side impact sensor (first) and the left side impact sensor (second); replace the floor wire harness, then clear the DTC.

16. Shorted wire check (LS2+, LS2- 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 floor wire harness): disconnected
    	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
    Test point 1	Left side impact sensor (second) 2P connector (female terminals) No. 1 (on the floor wire harness):
    Test point 2	Body ground

    Test point 1	Left side impact sensor (second) 2P connector (female terminals) No. 2 (on the floor wire harness):
    Test point 2	Body ground

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

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

    YES 

    The LS2+ and LS2- wires are not shorted. Go to step 17.

    NO 

    Short to ground in the floor wire harness between the left side impact sensor (first) and the left side impact sensor (second); replace the floor wire harness, then clear the DTC.

17. Shorted wire check (LS2+, LS2- 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 floor wire harness): disconnected
    	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
    Test point 1	Left side impact sensor (second) 2P connector (female terminals) No. 1 (on the floor wire harness):
    Test point 2	Body ground

    Test point 1	Left side impact sensor (second) 2P connector (female terminals) No. 2 (on the floor wire harness):
    Test point 2	Body ground

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

    Is there 0.2 V or less?

    YES 

    The LS2+ and LS2- wires are not shorted to power. Go to step 18.

    NO 

    Short to power in the floor wire harness between the left side impact sensor (first) and the left side impact sensor (second); replace the floor wire harness, then clear the DTC.

18. Open wire check (LS2+, LS2- lines)

    -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
    	SRS unit connector B (39P): disconnected
    	Left side impact sensor (first) 4P connector (on the floor wire harness): disconnected
    	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
    Test point 1	Left side impact sensor (first) 4P connector (female terminals) No. 1 (on the floor wire harness):
    Test point 2	Left side impact sensor (second) 2P connector (female terminals) No. 2 (on the floor wire harness):

    Test point 1	Left side impact sensor (first) 4P connector (female terminals) No. 4 (on the floor wire harness):
    Test point 2	Left side impact sensor (second) 2P connector (female terminals) No. 1 (on the floor wire harness):

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

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

    Is there 1.0 Ω or less?

    YES 

    The LS2+ and LS2- wires are OK. Disconnect and reconnect the connector, and then check the DTC again. 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 .

    NO 

    Open in the floor wire harness between the left side impact sensor (first) and the left side impact sensor (second); replace the floor wire harness, then clear the DTC.