I installed 2 front seats and now I have a service airbag light on the dash for pass seat. The seats were from a 2008 and I put them in a. '09.

 

Weight sensor or the connector for it.

 

So it looks like weight sensor is different. The older seat has 3 extra wires in the pin connector. So they don't look compatible to me. Not sure what I am going to do

 

First check the part numbers.

I was under the impression that the sensors are replaceable. Do you still have the old seat?

 

In the middle of same situation right now. Switched to SS seats, which, by the way, made an incredible difference! Dealer says I need to replace the original seat module, as the vehicle's computer will only recognize that one. They did try to make the new one work. I'm swapping put modules as soon as I click "send".

 

I thought about switching the modules but the weight sensors are different and the one is up in the cushion.

 

Lethal,

I went to switch the modules, but like you the connectors are totally different. Others have changed seats out, so not really sure why the universe is against us. My SS seats are from an '08 I think, installed in my '10 Panel.

One dealer tried to reprogram, but that didn't work. Another dealer says it simply can't be made usable. My next step is to go to a knowledgable stereo shop I do biz with and see if they can rig a something that will match up the old/new connectors. Going this Friday. I'll keep you posted.

 

Every model year during the lifespan of the HHR's production has minor differences, as to why, that's for the GM engineers to explain.

But an incompatibility in the SRS systems between model years does not surprise me, and do take care, airbags can and will kill you if you're not 110% sure of what you're doing.

 

That is one of the reasons that it is not legal to use SRS parts that don't match the year and exact model.

I had a GM tech bumble about for 3-4 hours trying to program a new SRS control module. They don't know what they are doing. As far as I can tell you should be able to match up new parts, each part has a serial number that needs to be coded into the computer systems.
Try a good body shop or ask them who does their airbag work.

 

I decided to make life easier I am going to switch upohlstry on the seats. This way I am not changeing any connectors or sensors