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Infamous 'No Sleep' Problem for E39 2003 530 Diesel Auto

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I have recently found that my E39 does not go to sleep after 16/17 minutes and that obviously drains the battery.

 

It has a good new battery, and the alternator works fine. It has a fitted Comms pack with mobile phone cradle and a stock C43 Business radio and CD autochanger.

 

I have checked the battery voltages at full charge, engine off = 12.6v and on idle = 14.2v.

 

I have just had the FSU replaced with an OEM one but the symptoms remain; the climate control fan whirs away behind the dash up to around 16/17 minutes have gone by then the Park LED goes out and the whirring stops. Then 5-7 seconds later something triggers and the CD autochanger clicks and the fan starts again, and the Park LED comes on. The fan continues for around 40-65 seconds then the sequence repeats.

 

i have pulled fuses F56, 57 and 58 in the boot. And fuses F9, F20 in the glovebox. And with the car locked and unlocked. No difference. Now getting desperate!

 

Advice please on what to check for next...

 

Many thanks.

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No Satnav fitted...just CD autochanger. And the Comms pack works great. Both the cradle phone and my smartphone with bluetooth link.

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This is not the cabin compartment ventilation fan that goes off when ignition off....it is another fan.

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Not disagreeing but there is a fan whirring behind the centre dash...

 

And I've repeated the fuse tests; Now have F56, 57, 58 and F9, 20, 21 out. No whirring noise now. BUT the Park LED stays on till around 17 minutes and goes off for 7-8 seconds then same as before...now can hear a small relay click just before the whirring starts, behind the centre dash...

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Maybe. I have a Touring with a hydraulic tailgate so have checked the wiring I can see. All seems ok. But without a full inspection and/or a multimeter test I can't be sure. The tailgate operates perfectly.

 

I have put back all the fuses one by one now - and noticed that when F9 is put back the whirring noise starts. And the pattern returns. This is a regular cyclic pattern of wake up that occurs every 7-8 seconds after a sleep trigger. I don't think the whirring fan nor the CD autochanger are the causes more like they are triggered by the wake up trigger.

 

F9 is 15A for Air conditioner, Heated washer jets and the Check Control Module panel

 

 

So the question is what would have a regular ~60s on period, sleep for ~7s then on again?

Edited by GAK

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Use a small piece of tissue and place it on the temp sensor vents on the HVAC panel(above cup holders) shut the door gently, lock up and come back in 2mins, there are two faults that plague the D4 range rover l322 which we all know is the big sister of the e39, one is that the heater hedgehog causes problems and the other is a phenomenon that even Landrover haven't ironed out and they give you another solution (which I can supply for a RR but not for a BMW I'm afraid)

Ps good luck

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Thanks.

 

I'll try that. But I have left out the HVAC fuse F9 to stop the sampling fan...I assume you want this refitted before the tissue test?

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Maybe your fan isn't old, worn and dusty and hence noisy. Or maybe you don't have automatic climate control? Is your car an automatic?

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Like said the there is a small fan inside IHKA (AC control unit), but that is not a cause for problem on the sleep mode, just a sign that the vehicle is woken up again. If you have ruled that the car stays on sleep mode when fuse F9 is removed, IHKA could be faulty as F9 only supplies that. There is also a possibility that the Webasto aux heater has something to do with this. So remove fuse F47 separately to see what happens.

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Thanks.

 

I'll try that. But I have left out the HVAC fuse F9 to stop the sampling fan...I assume you want this refitted before the tissue test?

Obviously you want the fault to be present, also I've re read my comment and the solution LR give is a 4 pin relay and what I can't supply you with is the way it is fitted to an e39

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I have the exact same problem. Not got to grips with it.

Resorted to locking the car up with boot open, then disconnecting the battery and closing the boot. 3 days without doing this and the battery is dead. I have changed the hedgehod with no change .

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I have the exact same problem. Not got to grips with it.

Resorted to locking the car up with boot open, then disconnecting the battery and closing the boot. 3 days without doing this and the battery is dead. I have changed the hedgehod with no change .

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I have already ruled out the Aux Heater by removing F47. No change. And with F9 removed all I have done is prove that the power to the fan has gone; no whirring. It is simply a sign that the car has woken up. There is something that regularly triggers the GM...and I have already tried leaving the car unlocked today. So not likely to be the Locking sensors.

 

The tissue is in place nicely and F9 is back. Whirring occurs. What were you hoping to happen? And the LR relay what does this do in the LR?

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You're hoping that the tissue drops, if it doesn't the entire HVAC system isn't sleeping, LR recommend cutting the entire power to the Climate panel and use the relay to enable it all when the ignition is on

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Ok. Understand now. I checked and there isn't enough suction when the fan is on to cause the single ply tissue to stay put. It really is a gentle whirring that barely draws air. probably a clogged up pair of vents, and a fluffy fan..will have a forage tomorrow and see.

 

Reading the Data Bus pdfs on the web I can see that the GM polls the P-Bus every 5s. That's pretty close to my observed 5-8 seconds wake up...and the only things hanging off the P-Bus are the Drivers and passenger door modules, seat memory module and sunroof module. And the IHKA hangs off the GM via the K-Bus but I don't know if that's being polled.

 

Really need a BMW diagnostic tool to monitor the bus comms....

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Thanks for the thought though. I have a couple more things to try out tomorrow; pull the bonnet alarm plug (not likely as there's no false alarms), and pull the aux fan plug. Both could trigger a wake up to the GM.

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No joy with the bonnet alarm sensor. And the AC fan plug isn't accessible. Not behind the driver's headlight unit. Looks to be somewhere inboard of the bumper  :roll: . So I've tried another possible culprit; the cabin alarm sensor. Nope. Still awake....

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 Update: Will need to get it into an Independent BMW specialist; last to things to check are the AC fan and the alternator rectifier pack. Those would draw some Amps if faulty. Maybe an Auto electrician as a full parasitic current trace will be needed along with a check on all Earth points. :(

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