Honda HR-V: DTC Troubleshooting 81-51, 81-52, 81-53: Internal Failure of 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 and General Troubleshooting Information.
• 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.

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.

Is DTC 81-51, 81-52, or 81-53 indicated?

YES

The failure is duplicated. Replace the front passenger's weight sensor unit.

NO

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

DTC TROUBLESHOOTING 81-54: SHORT TO POWER IN THE FRONT PASSENGER'S WEIGHT SENSOR POWER CIRCUIT

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 and General Troubleshooting Information.

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.

Is DTC 81-54 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. Shorted wire check (SWSP1 line to power):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connectors.

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

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

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

3. Disconnect the front passenger's weight sensor (front inner side) 3P connector (A) on the front passenger's seat wire harness.

4. Turn the vehicle to the ON mode.
5. Measure the voltage between test points 1 and 2.

Is there about 5 V or more?

YES

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

NO

The SWSP1 wire is OK. Go to step 3.

3. Shorted wire check (SWSP2 line to power):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the front passenger's weight sensor (rear inner side) 3P connector (A) on the front passenger's seat wire harness.

3. Turn the vehicle to the ON mode.
4. Measure the voltage between test points 1 and 2.

Is there about 5 V or more?

YES

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

NO

The SWSP2 wire is OK. Go to step 4.

4. Shorted wire check (SWSP3 line to power):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the front passenger's weight sensor (front outer side) 3P connector (A) on the front passenger's seat wire harness.

3. Turn the vehicle to the ON mode.
4. Measure the voltage between test points 1 and 2.

Is there about 5 V or more?

YES

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

NO

The SWSP3 wire is OK. Short to power in the front passenger's seat wire harness; replace the front passenger's seat wire harness, then clear the DTC.

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