Car sat for a couple months. Charged up battery. Cranks but won't start. No codes. Initial diagnosis led me to finding the green wire to the coils does not have 12 volts on it when key is on.

Checked the associated relay, and it has 12 volts at pins 1 and 5 as it should. Swapped relays, and no change. Jumped relay pins 1 and 2, and the car fired up.

Pulled the JBE to check for water damage even though the floor has never been wet. A couple pins had very minor white corrosion, but nothing major. Pulled the JBE apart and there is no corrosion, burnt pins, or dry solder joints, but of course with the double board you can't see all of it. Cleaned up the minor corrosion and reinstalled it. JBE main power input has 12.5 volts.

Still no joy. The front wipers also don't work, but the rear one does. The windows work. HVAC works.

Anyone have any thoughts on were to go next? Clearly the JBE is not activating the relay to the coils, and the wipers don't work so that seems like the JBE is where the problem should be.

 

Assuming a standard Cube Relay with standard pinout (30, 87, 85, 86 nomenclature)...

I would meter the JBE socket, including the ground pin. I once correctly diagnosed a bad Jeep fuel pump because the ground pin (85) was NOT grounded. The fact that you have other peripherals not working leads me to believe that there is an issue with either the ground pins or the constant power (line) pins. I imagine both are connected and fed through some kind of bus. Dollars to doughnuts something is going on with either the Constant Power bus or the Ground bus (which may be either internal or external to the JBE). This is an educated guess not derived from real-world Mini Cooper experience. So forgive the generality of my comment.

Good luck!

D

 

Correction to your thread title - this is a R60.
The front wipers also depend on 2 relays (K36 ON/OFF & K37 SLOW/FAST) at the rear of the engine compartment fuse box (closest to driver), supplied power by a 30A fuse (F09). Both relays are activated by the JBE as you already know.

 

You are correct, of course. It is an R60. I was aware of the relays, and had checked supply power on those as well. Thank you.

 

After acquiring the wiring diagrams, I spent a fair amount of time with my meter looking at supplies, grounds, and signals. I got quite a bit of what I thought were conflicting readings. I couldn't get it to make sense. In desperation, I bought a JBE from a salvage car that was the same year, thinking that if nothing else, I could swap the rear JBE board of my car with the one on the donor JBE, as detailed in other forums. Just for kicks, I tried just plugging the donor JBE in to see if the thing would start, and surprise, it fired right up! Not only that, but all the functions on my car, including the wipers, are now working.

I was led to believe that these JBEs were very specific to each car, and perhaps that is true, and I just got lucky. The part numbers didn't even match. Whatever the case, my issue is now fixed for the princely sum of $99 (plus tax & shipping).

Thanks for your help.

 

I believe this is true for the Footwell module only. But don't quote me on that....<;^)

You bet. Glad you got it going.

D

 

There are a few options that can be coded ON/OFF (aktiv / nicht_activ) in the JBE (aka SPEG), so worse case you loose their function depending on how the donor car was built.
- rainsensor
- headlight washers
- alarm system
- sport button
- autodimming mirrors
- AUC sensor for HVAC
- Heated seats

 

Thanks for the info. I do have Bimmercode, so I will have a look at them later, after I figure out the rotational thumping noise I'm now trying to diagnose.