SRS light and OPDS replacement procedure
2001 MDX 172K miles. SRS light was on and would no longer reset and stay out when resetting manually ( shorting out the yellow connector ). I paid a local Acura/Honda independant to check it with his Honda software. Cost $92.00. The SRS trouble code was 15-3 Faulty OPDS sensor. He wanted an additional $394. to replace it. P/N 81334-S3V-305. I checked the internet for cost, $209.72. I got it discounted at the local Acura dealer for $144.04. The Acura parts guy also printed the repair procedure to replace to OPDS unit. Maybe you can get that as well.
Here's the info:
The OPDS sensor is located inside the right front seat in the left side bolster. It is approx. 2.5 X 5.00 inches. You can feel it behind the bolster. You need to remove the seat back panel, popping the seatback panel bottom out and lifting it off. This destroys the 2 plastic clips at the bottom that hold the seatback panel onto the seat. Remove the 2 broken clips. You will see where they attach to the seatback panel.Those 2 clips P/N 91566-SPO-003 at Acura dealer discount cost $3.60 each. You then lower the seatback as far as it will go and slide the seat to the rear so you can get at the bolster from the back seat. In looking at the now exposed rear of the seat, you will see a series of plastic clips that hold the seat cover onto the seat frame. The clips go over a up down metal rod. Pull the left side clips off the rod from top to bottom, releasing the left side of the seat cover. Peel back the left side of the seat cover and bolster toward the front of the car. It's a bit stiff. The OPDS has a clearish plastic cover. It comes off by pulling it out from the bottom and lift it up. The OPDS unit has one phillips screw at the top and 2 at the bottom. There are elec. connectors at the bottom. Unscrew the old unit and pull it out. Unplug the elec. connectors and plug them in the correct order into the new unit. Peel back the seatcover and bolster once again and screw in the new OPDS init. Put the clear cover back on. Reverse the procedure to put the seat back together. One note of caution ( I screwed this up ). Insert ( slide)the 2 new seatback panel clips into the 2 clip holders at the bottom of the seatback panel. When you slide the 2 clips into place, don't slide them in completely, and also, position the clip prongs horizontally ( the delaer told me this??). Then put the top of the seatback panel into the seat, move it into proper position left to right. Reach under the seatback panel with your fingers. You will feel the 2 holes in the seat frame that the clips go into. Just align the tip of each clip with the holes and press in the seatback panel. This should secure the clips. If not, once you feel the clips are in place for the holes, just give the seatback panel a bump with your hand to secure it. I was not patient enough ( my wife says ) and I got only one clip in place. I had to remove the seatback panel, broke the 2 clips and buy 2 more clips. With her help, we got it the second time. To reset the SRS system, you cannot "manually" short out Yellow SRS reset plug to get the SRS system to reset and the SRS light to go out. It requires the entire SRS system to be reset. I had to go back to the independant Acura/Honda repair guy and pay him 3/4 hour labor $62.00.] to put the car on his software and reset the SRS system so the light goes out. It now is correct YEAH. My wife is happy.