Update: Sent the ecm to SIA for repair and am happy to say that for less than 175 bucks the car starts right up every time. I was too chicken to attempt the repair myself and took a gamble on SIA. I purchased the repair on ebay for quite a bit less than list price. Needless to say I am extremely ple...

Yep, somebody's already been there. Maybe what you are experiencing is the result of a dying battery? Low voltage can do some strange things to electronics.

The 5 amp fuse I'm referring to is for the Siren module only and is labeled as such. This is the module that has its own internal battery that can take a dump on the PCB rendering the whole thing useless. Would have to spend a couple hundred to replace it or if you are lucky and the board is salvage...

[/quote] I have the battery pulled and on a charger/maintainer until I determine if this is a parasitic draw. My thought process is leading me towards the alarm module - I never lock the doors because it is known bad and would drain the battery if I activated it. I'm curious if, after I get to the m...

I don't know the answer but that is interesting. So, the taillights were pulsating when the car was just sitting there not running and without the lights on?

So, I removed the Bosch ECM and opened it up and there appears to be a failed component on the board. The damage appears minor and is confined to a small area around what appears to be a resistor. Looks like the resistor might have went bad and leaked black stuff around it on the board, if that is e...

Hello all, I am new to the Volvo world having just picked up a super low mileage (26k) near mint condition 2000 S80 2.9. Its a southern car (no rust), garage kept and rarely used, especially over the last 15 years. When I went to look at it it was hard to start but after much cranking it did start a...