996 C4S dashboard LCD problems - need help

[maeowenti]

I am hoping there is someone out there who can point me in the right direction with my dash LCD problem (digital speedometer, clock and odometer) The problem is they stay illuminated when the vehicle is locked and armed, thus slowly draining the battery. If the ignition key is removed, the LCD's shut off in just under 4 minutes (like they're supposed to), but as soon as I lock the car the LCD's momentarily shut down, and then come back on again either immediately or after 5 - 15 minutes. There are many threads covering similar dashboard issues, but nothing relating to my problem.

I've had some diagnostics run on the car and two error codes were found (but no indication of when they occurred. My car is a 2004 model and I've owned it trouble free for 10 years, so I'm thinking the codes are old) Error codes 54 and 59. Searches on these codes indicate central locking issues, and the threads referred to earlier point towards door locks, ignition and light switches, but all of these modules are working fine, i.e. windows drop on opening, interior lights come on etc. Everything is working fine except these darned LCD's when the central locking is armed.

Please has anybody experienced this fault, and what was the remedy?

[Fastlane]

I'd post this up on the 996 forum on 911uk.com - there are a few people on there who will be able to help, including a Porsche trained tech.

[nxi20]

Ignition switch going bad throws up your symptoms, plus a slew of others such as the headlights switching off whilst driving(!)

Ask me how I know...

Very fiddly to change due to a lack of room to work.

[maeowenti]

Thanks to you both for responding. I'll register on 911uk.com and post there, and do some more digging on the electrics