In case it helps anyone else:
My mother's 2011 Jazz remote locking fob(s) stopped working. I have no idea
what may have triggered this. Both fobs were working (red LEDs came on when
buttons were pressed), but the car would not respond.
On top of that were some other symptoms.
1. The key would lock/unlock the driver's door, as one would expect, being a
mechanical connection, but would not activate the central locking to do the
other doors.
2. The Master lock switch on the door would not do anything unless the
ignition was on.
3. The button (or 'tab' as they call it) next to the driver's door handle
would lock/unlock all the doors if the ignition was on, but with it off, the
button would lock/unlock only the driver's door.
4. The courtesy light would not come on regardless of the switch position,
and the map lights would not work.
Years ago in another context I had heard of resetting electronics by
connecting a car's positive and negative leads (with the battery
disconnected of course). Before 'risking it', I put a DVM on its voltage
setting between the Jazz's positive and negative leads, and got a reading of
0.01V.
Next I put the DVM on its current setting, and got a very small reading for
just an instant. Finally I touched the positive and negative leads together.
With the battery refitted everything was back to normal. Now I am anxiously
waiting to see if it will repeat the problem some day.
Apologies if this has been posted elsewhere (I did look but could not find
it).
