2005 Mini Cooper S - No start problem
My trusty R53 has developed an electrical problem which I've been working to solve for the last few days. Unfortunately its intermittent making it all the harder to trace.
When I put the key in the ignition and turn it to on, usually I get several dash warning lights, hear the fuel pump and heater fan startup, the starter turns the engine over as normal and the car starts. Recently when I turned the key to On, I got one dash light (Door Ajar, I think) no fuel pump and no heater fan. The starter would still turn the engine, but it doesn't start. After a few tries, the fuel pump and heater fan startup, the several dash lights come on it starts as normal.
I've tried to trace the problem through the various control units and relays, but haven't been able to solve it yet.
As far as I can tell, this is not an EWS problem because the starter always turns. If I don't push the clutch pedal in, the starter doesn't turn, indicating the Body Control Module is getting the correct signals from the clutch switch and key code. Plus, all the other Body Control functions, door locks, windows etc. all work fine.
I've got the manual and the electrical diagrams, but am having some problems interpreting them. As far as I can tell, with the ignition switch on, the main relay should energize which in turn triggers several more relays, but haven't found how in the sequence the fuel pump relay is energized.
Does anyone have any ideas or can point me to a reference showing the startup sequence?