[thom4782]

The hazzard light circuit is energized by the hazzard warning switch whether or not the key is in the ignition. For this reason, I would doubt the ignition switch is the cause. The lights are also energized by the central locking system. Because your horn beeps sometimes when you lock the car. If it's an occassional quick double beep, then there's a central locking system problem. Mostly, likely the random double beep would indicate a locking system synchronization issue.

Assuming I've made a good guess...

If you have a diagnostic tool like a Durametric, you can look to see if there are any fault codes stored in the system. You can also test the locking system components to see which one might be acting up. If you don't have a diagnostic tool, then a dealer or independent shop can do this

Taking an even bigger WAG, I'd bet one of your door latch sensors works intermittently. You might try the following sequence to see which one it might be.

1. With the key out of the ignition and both doors closed, lock and unlock the doors using the switch on the center console.

2. With the key out still of the ignition, test the hazzard lights using the hazzard warning switch and verify that they work as expected.

3. Open both doors, try to lock and unlock the doors using the console switch. Put the key in the ignition. If the hazzard light problem doesn't occur after several tries, then one of the door latches might be broken.

4. Take the key out of the ignition, close one of the doors, lock and unlock again using the center switch, put the key back in the ignition and see if you can re-create the problem.

5. If the problem happens, open and close the closed door and repeat the test. You might try this a couple of times to see if the sensors in the door are working intermitently. It the hazzard problem happens all the time or occassionaly with the door closed and it didn't with both door open, then the closed door's latch is probably defective and indicating to the locking system that it isn't synchronizing properly.

6. If the problem doesn't re-occur, open the door you've been working on and close the other door. Repeat steps 4 and 5 for the newly closed door. If the problem occurs, then that's the likely problem area.

The general idea hare is to see if the problem is with one door's sensor or the other door's sensor. If the problem occurs with only one door closed, then I'd guess the problem is in that door, If the hazzard light problem occurs with both doors independently, then I'd guess the source of the problem is somewhere else in the central locking system.

Hope this helps you to narrow down the source of your problem. Perhaps, others have a simpler or better way to test.