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986 Boxsterwill not start

richardjjs1

richardjjs1

Member
Member
2003 2.7 Manual
We had major ingress of water into the rear footwell of the passenger side
This has been corrected and all the water removed from the well. There is no water and we removed the seat and there is no apparent damage to the CUs

The fob does not lock the car - it beeps twice to say there is a problem.
If you turn the key it also does not lock
Charged the Battery over night
The car will just NOT turn over - nothing no clicking. But all the lights are on
On the 997 you need to push the clutch down to start and its this symptom that APPEARS to be the problem on the 996
I was under the impression that if you put the key in it should at least turn over

Any ideas please





 
Sounds like you might have a water soaked alarm module that no longer works.
Sometimes you can take them apart, dry them out and clean up the contacts to get them going again, but more likely you will need a new immobilizer/alarm ecu.
Thanks

 
I tend to agree with irb26. Water ingress damaging the alarm/locking control module is a frequent event with the 986. Usually means having a new one fitted and coded. You also need to sort out the cause of the ingress to stop it happening again. This is usually caused by blocked rear drains or possibly a leaking door membrane. Easy to spot the latter by the carpet at the bottom of the door being soaked.
 
As you say The Drain Hole was blocked under the flap that holds the roof when it is folder down
Easy Fix Cleared the hole and he dried out the Water under the seat
My main question is that will this stop the car from even turning over.
Did take the seat out and check the 3 ecus under the seat
All SEEMED dry there was no water at all around (Carpets wet but no water at all around the ECU)
Will go tomorrow and take all three out and make sure they are dry

Thanks




 
Hi Richard, good to hear that you found and cleared the drain holes.

No turnover at all often indicates that the immobilizer is active. To me that ties in with your finding that you can't lock the car with the fob. i.e. it all seems to be pointing to an alarm module issue that has left the car immobilized. The other possibility is that the battery is so low that it won't power up the control module. Even though you have charged it I have found in the past that once a battery is gone, no amount of charging will help. However a bad battery on a 986 often shows other symptoms like the clocks not lighting up and the windows drop. So while it might be worth trying a new battery I'm not optimistic that is the cause here.
 
Ive traced a M534 Module DME and 2 keys on eBay 450.0

Apparently if it all ties up with exiting unit part numbers it should all work

So if we cant dry out repair M534 ay least we can get the parts at a price

Wil check battery. Silly me I took one with me and didn't try it!!
 
Hi

In answer to your question - yep - a ruined alarm ecu will prevent the car from starting, and can cause all manor of other strange behaviours as well.

Last time i checked a module was around the 250 ish mark from OPC, but the prices have risen a bit lately.

You are also reliant on being able to read out the old module to use the keys that you have.
If you can't read the module then the keys are also no good !!

You can get a secondhand DME/Alarm ecu kit with keys already programmed off of ebay or similar.
This option does work but try and get as close possible to the spec of your car otherwise you will need to get the modules recoded to suit your spec.
(so you should get a UK model 2.7 with the necessary options if this is what you have etc).

Before you jump in and buy new modules etc which are expensive , it might be worth checking to see what faults you have with the module.
There are a few members on this forum who can do this if you don't have the necessary equipment (myself included) - just find someone close to you.

Just be aware that it could also be a wiring issue or some other fault - although the module sounds the most likely as its had a swim.

Thanks

 
irb26 said:
Hi

In answer to your question - yep - a ruined alarm ecu will prevent the car from starting, and can cause all manor of other strange behaviours as well.

Last time i checked a module was around the 250 ish mark from OPC, but the prices have risen a bit lately.

You are also reliant on being able to read out the old module to use the keys that you have.
If you can't read the module then the keys are also no good !!

You can get a secondhand DME/Alarm ecu kit with keys already programmed off of ebay or similar.
This option does work but try and get as close possible to the spec of your car otherwise you will need to get the modules recoded to suit your spec.
(so you should get a UK model 2.7 with the necessary options if this is what you have etc).

Before you jump in and buy new modules etc which are expensive , it might be worth checking to see what faults you have with the module.
There are a few members on this forum who can do this if you don't have the necessary equipment (myself included) - just find someone close to you.

Just be aware that it could also be a wiring issue or some other fault - although the module sounds the most likely as its had a swim.

Thanks
Click to expand...
If it is the alarm module/Immo that is faulty then all you need to do is get a donor unit from same year of car and if you're not a soldering expert get someone to swap the 93c66 EEPROM from your unit to the donor unit then it is just plug and play. I have done several of these that have been water damaged in my job.
 
Thanks for all the help Hopefully sorted
As we know the rear drain plug was blocked causing major ingress over the Central Locking ECU. (M534)
The owner dried out the carpet really well and the CUs SEEMED dry
Car not starting as you say was the ECU

AA called and showed him the problem and he said we will try and dry it out - which he did
The car is now starting and windows are closing properly but its not locking
This saves hiring a car for a week and getting the car towed in

The car is booked into Wolverhampton Porsche as it needs new Key Fobs and they are the only people who can supply and re programme then. We expect that a new M534 will be needed and we have been quoted 890 for a new Unit, 2 keys and fitting and reprogramming~
The good news is that the old info should be in the CU and not need down loading from Porsche

Did contact a breaker and because the 986 is very late there where no units available for his model
Was quoted 600 for E534 and Main ECU and one key!!
The problem with this is that it retains the info from the donor car unless you can down load the info from Porsche

So rather than pay 620.00 for 1 fob that may all work we would rather get new ones 890. with 2 years warranty and 2 keys!! (which are 200.00 each programmed!!)


THANKS again




 
richardjjs1 said:
Thanks for all the help Hopefully sorted
As we know the rear drain plug was blocked causing major ingress over the Central Locking ECU. (M534)
The owner dried out the carpet really well and the CUs SEEMED dry
Car not starting as you say was the ECU

AA called and showed him the problem and he said we will try and dry it out - which he did
The car is now starting and windows are closing properly but its not locking
This saves hiring a car for a week and getting the car towed in

The car is booked into Wolverhampton Porsche as it needs new Key Fobs and they are the only people who can supply and re programme then. We expect that a new M534 will be needed and we have been quoted 890 for a new Unit, 2 keys and fitting and reprogramming~
The good news is that the old info should be in the CU and not need down loading from Porsche

Did contact a breaker and because the 986 is very late there where no units available for his model
Was quoted 600 for E534 and Main ECU and one key!!
The problem with this is that it retains the info from the donor car unless you can down load the info from Porsche

So rather than pay 620.00 for 1 fob that may all work we would rather get new ones 890. with 2 years warranty and 2 keys!! (which are 200.00 each programmed!!)


THANKS again
Click to expand...
Hi, so even though your modules seemed dry, they were damaged? I have the exact same problem.
 
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