I just bought a 2007 Lucerne and the service pressure monitor stays on. I get a pressure on the left front (driver's side), but only get dashes on the other three. I have tried the relearning procedures. 1. turn on key 2. enter relearning mode 3. hit check 4 relearning active notice along with two horn chirps.
I have then added/reduced air pressure beginning on driver's front tire. I do not get any more horn chirps. I have tried this procedures on all four tires and get the same results. I read somewhere on line you can turn parking lights on/off three times within 4 seconds and that will reset the monitor. Tried that and nothing happened.
Can anyone give me any additional advice?

 

Those have a battery in each valve stem. Being an ‘07 one may be low voltage. Those last maybe a decade?

 

I think Rich brought up a good point. Ten years is about the limit for the batteries in the senders. Hang on to your wallet, because those pressure monitors can run around $100.00 each. Might be a good idea to have a tire shop or garage equipped with the tool to program them and check them out.