2011 BMW (F10) 528i. Change heater blower motor, car would crank but not fire. Old battery. Installed new battery, same

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Customer: 2011 BMW (F10) 528i. Change heater blower motor, car would crank but not fire. Old battery. Installed new battery, same thing. Will crank but wont start. Fuel pump relay?????
JA: How many miles are on the BMW? Has the BMW been starting normally?
Customer: Yes, was starting fin unitl today when I changed heater blower motor. Car has 52000 on it
JA: Are you fixing your 528i yourself? What have you tried so far?
Customer: INstalled new battery. Trying to locate fuel pump relay. IT will crank but not fire. Thining fuel pump
JA: Anything else you want the Mechanic to know before I connect you?
Customer: No.
Answered by Matt in 22 mins 3 years ago
8+ years of experience

36,802 satisfied customers

Specialities include: Automotive Mechanic, Small Engine Repairs, Auto Body Repairs, Diesel Engine Repairs

Hello and welcome to Just Answer

My name is ***** ***** I've been an automotive engineer since 1996 and together we're going to solve this issue.

I'd agree that it could well be the fuel pump not being enabled and the pump relay should be located in the fascia fusebox see the attached image

Looks nothi g like my 2011 528i fuse box

OK if you have found the pump relay is it turning on?

, replace the relay if in any doubt and do the same for the fuse,

Wow. Unbeleivable. Your a genius.

OK please bear in mind I have no idea of your level of experience or what you have tried already

so have your tried a new relay?

have you tested to see if there's spark ?

if you have a scan tool then its also worth plugging that in and seeing if you get an rpm signal coming through

Was running fine. I changed the heater blower motor because it was a bunch of leaves and it clogging up making noise. Go to start it back up now it just cranks no spark no fuel one of the other. Where is the fuel pump relay fuse in a 2011 528i?

OK, if there's no spark then this is sounding like that the ECM is getting no power or there's no crank signal

and there's no pump relay on this model as all the fuel pump control us done via a pump control module that contains the relays

so there should be a fuse but it will be labelled up as fuel pump control

so as you have had the heater blower off its quite possible that the ECM socket was disturbed and possibly disconnected?

Where is the ECM socket located?

Looks like its tucked under the inlet manifodl

see this video


Getting no spark to the plugs. Pull two out and cranked it .no spark
Everything that I disconnected was reconnected , took photos to ensure I have everything back as it was. Is there a ECM or ignition fuse that I can check? In the truck or in the glove box?
No OBD error codes, still no spark

OK here is a system wiring diagram of the car


and the actual diagram


admittedly its for a 535 not a 528 but the module location and wiring to is extremely similar if you look on p26 you'll see the starting system for the car and there is a DME relay thats fed by the engine electronics fuse centre

there should be a DME / ECM power supply fuse in the underhood fusebox

and as you have no error codes or spark it really feels like the ECM isn't getting power at all

I'm assuming that the dash is lighting up and that its cranking so this means its unlikely to be a security system fault

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