Airbag light on car for passenger cutoff indicator. Took whole seat out reconnected it blew out the seat belt light. This error is off only when nobody is in the seat and it’s buckled. I’m stumped.if someone sits in it buckled or I unbuckle it get this error again. .

 

There is a weight sensor in the seat - I think the airbag only activates if there are <some amount> of KGs sitting in there. There is a process to calibrate that sensor, search previous threads.

 

Looks like the HDS is needed for calibration process?

Calibrating the Front Passenger's Weight Sensor Unit

Calibrating the Front Passenger's Weight Sensor Unit
When you replace the front passenger's weight sensors or OPDS unit, calibrate OPDS unit.
While calibrating the front passenger's weight sensor unit, observe these precautions:
-Make sure all components of the front passenger's seat are correctly installed.
-Make sure nothing is on or under the front passenger's seat.
-Make sure there is nothing in the front passenger's seat-back pocket.
-Keep the windows closed.
-Perform all calibration procedures, except test-driving, in the service bay.
-Make sure the vehicle is on level ground.
-Keep the A/C and the heater off.
-Do not touch the front passenger's seat until you drive the vehicle.
-Do not expose the front passenger's seat to sudden temperature changes.
1.Position the front passenger's seat to the rearmost position, adjust the seat height to the lowest position, and adjust the recliner to the most forward position. Do not move the seat from these positions.


2.Connect the HDS to the data link connector (DLC) (A).
3.Drive the vehicle, and accelerate to 20 mph (36 km/h), then stop on level ground.
4.From the Main Menu on the HDS, select SRS, then seat weight sensor, then Misc Test, then Adjustments. In the Adjustment Menu, select "SWS UNIT," and follow the prompts until the initialization operation has been completed.
5.Prepare a 55 to 77 lbs (25 to 35 kg) weight, then measure and note its actual weight (M) with a scale.
NOTE: The accuracy of the scale must be within ±2.2 lbs (1 kg).
6.Place the weight on the front passenger's seat.
NOTE: Leave the HDS connected and in the Misc Menu.
7.Drive the vehicle, and accelerate to 20 mph (36 km/h), then stop on level ground.
8.From the HDS's Main Menu, select SRS, then Seat Weight Sensor, then Misc Test, then Inspection. In the HDS Inspection Menu, select "SEAT OUTPUT CHK." The weight (T) of the front passenger's seat is recorded by the HDS.
9.Calculate the variance between the weight measured on the scale (M) and the HDS (T) with the formula shown.
Variance = (T)-(M)<±8.6 lbs (3.9 kg)
M: Weight measured on the scale
T: Weight measured by the HDS with the weight on the seat
-If the variance is ±8.6 lbs (±3.9 kg) or less, calibration is complete. Go to step 18.
-If the variance is more than ±8.6 lbs (±3.9 kg), remove the front passenger's weight sensors, and reinstall them, then go to step 10.
10.Remove the weight from the front passenger's seat.
11.Drive the vehicle, accelerate to 20 mph (36 km/h), then stop on level ground.
12.From the HDS inspection menu, select Seat Weight Sensor, then "SEAT OUTPUT CHK." The weight (T0) of the front passenger's seat is recorded by the HDS.
-If the reading on the HDS (T0) is ±6.6 lbs (±3.0 kg) or less, go to step 13.
-If the reading on the HDS (T0) is more than ±6.6 lbs (±3.0 kg), repeat this procedure from the beginning.
13.Measure and note the prepared weight (M1) again with a scale.
14.Place the weight on the front passenger's seat.
15.Drive the vehicle, accelerate to 20 mph (36 km/h), then stop on level ground.
16.From the HDS Main Menu, select SRS, then Seat Weight Sensor, then Misc Test, then Inspection. In the HDS Inspection Menu, select "SEAT OUTPUT CHK." The weight (T1) of the front passenger's seat is recorded by the HDS.
17.Calculate the variance between the weight measured on the scale and the HDS with the formula shown.
Variance = (T1)-(M1)<±8.6 lbs (3.9 kg)
T1: Weight measured by the HDS with the weight on the seat
M1: Weight measured on the scale.
-If the variance is ±8.6 lbs (±3.9 kg) or less, calibration is complete. Go to step 18.
-If the variance is more than ±8.6 lbs (±3.9 kg), replace the front passenger's weight sensors (if they were not replaced before this procedure), and repeat this procedure from the beginning.
18.Turn the ignition switch OFF, and disconnect the HDS from the DLC.

 

Other diagnostic tools can often complete these calibration processes - I have an AUTEL AP200 that I use with my phone, and there are a whole bunch of calibrations available in there, I successfully calibrated my Steering Position Sensor in the past. I can't remember if the Seat Weight Calibration is in there or not, but there was another thread with a guy who successfully did this procedure with a non-Honda diag.

You'll need a diag that has dedicated Honda modes, it won't be present in a basic generic OBD2 device.