Recently purchased my first rx8 from someone saying it had issues with the immobiliser. Turns out the immobiliser wasn't the issue but a voltage drop on the battery was causing problems with the immobiliser circuit not operating correctly.
Anyway monitored the battery voltage and when I connect it up without the BTN fuse and it is stable at over 12Volts. (With BTN fuse fitted it drops to around 6Volts).
With BTN fuse removed, and put the key in the ignition and voltage drops again once the key reaches or passes the ACC position.
Anyone have an idea what could be causing the battery drain for both the BTN fuse and Ignition key in the ACC position?
Thanks
http://www.mazdarotaryclub.com/rx-8_onlinemanual/index.htm
hit this link.....you want electrical section 13 page 5.....this shows you what BTN fuse feeds....via room fuse.....all the sub electrical systems quite a few are feed from the btn to room fuse and the power windows from the BTN. your goona have to isolate these circuits individually in order to find the drain..
id pull the room fuse and see if drain this side of fuse. There are a lot of sub electrical systems fair bit of work.....where abouts are you id love a go at this right up my street! :P
Cheers for advice, been through the fuses and it's the room fuse causing the drain so something after that fuse is draining battery. Strange I'm getting the drain with the ign switch in ACC position also :(
I'm in Glasgow, so a bit far for you to have a look, cheers for the offer though!
Quote from: boosted on March 16, 2016, 09:06:23 AM
id pull the room fuse and see if drain this side of fuse. There are a lot of sub electrical systems fair bit of work.....where abouts are you id love a go at this right up my street! :P
The room fuse fed via BTN is a permanent feed and the acc is a switch feed . So all the sub electrical systems that are fed by both are suspects. Its eliminated a few now. The fact its happening with room fuse pulled and acc switched which is basically a on signal with room fuse providing the power suggests a slight short to earth poss water in something tracking some voltage to earth. If a dead short it would blow the room fuse instantly.
Print that page 5 out and get a highlighter pen and follow the room fuse line to every component. Then with another pen follow the acc line to all the components. Youll be left with all the components that have 2 colours going to them...now is a case of disconnecting each component from both there supplys and finding the culprit.
Also has the car had any funky gizmos fitted i.e interiors lights or bass amp or something? Where someone has chopped into the loom and messed it up!
Good luck....this is bread n butter to a auto electrician might be worth the hours labour and you got yourself a cheap car.