Dodgy Earth? 300tdi 90 alarm hazard lights issues

[A Twig]

Hi all,

This one is baffling me a bit. the Alarm on my 300tdi is being a bit temperamental. Whenever I arm it, the hazards flash correctly 3 times. However, when I disarm it, the hazards dont always do the one long flash as they should.

The interior lights come one and the Dash LED flashes correctly, but no hazards. Then after a while maybe a week or two, the normal function will suddenly return for a while, then after a while they will stop again.

The Defender Electrical Library states:

The alarm ECU (C057-8) also receives a constant battery feed from fuse 1 of the passenger compartment fuse box (C580-2) on a purple wire. This feed is then used to power the hazard warning lamps (C057-1 & C057-6)

Looking at the wiring diagram, there are separate circuits for LH and RH hazards, so there can't be a common earth issue. Also, according to the wiring diagrams, its the same circuit for the arm as well as the disarm, so I don't understand how apparently its the same circuit, yet it works in one case but not the other?

Any ideas?

Cheers

[A Twig]

Don't tell me I've stumped the collective hive mind of LR4x4!?! No one got any ideas? Incidentally, I changed some indicator bulbs today as I was changing the light lenses, and they've started working again... It's driving me nuts!

[A Twig]

Last plea for help before I tear the inside of the old girl apart and re-wire the whole circuit on Friday arvo?

[western]

I'm not familar with the 300tdi alarm system, suggest having it plugged in to diagnostics to see if there are any faults logged, which may give a clue. or it could just be a very poor ecu.