When I first picked up the car after the install. I randomly tried the remote a couple of times and it seemed DEAD. A day later, I dismounted it from the steering wheel mount, and waved it around while pressing buttons and it still seemed dead. I subequently reseated the battery with no effect. Later, I remembered that the CD-SR11 is INFRARED!
Because my Z1 is truly flushmounted in the dash, it REALLY doesn't like SUNLIGHT. The Sun will interfere with the CD-SR11 around mid-day every time. It will also interfere, depending on your direction of travel, in the early morning/late afternoon. Basically, if I have sunlight shining on the Z1's IR receiver, the CD-SR11 is almost guaranteed to work only intermittently or not at all. So, if you are thinking about adding one to your system, try it out at the dealer to see how much impact the sun will have.