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car won't start : Driveblock troubleshooting


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Hello there,

I need all your help before I go crackers

my 993 do not start anymore. Before that, the car started erraticaly, sometimes yes, sometimes no.

The car doesn't crank, the DME relay doesn't click, only relays kl 15 and kl X work when i turn the key( i don't know what is their function). As the DME relay doesn't work, the fuel pump doesn't start.

The dashboard lights up normally on key positions 1 and 2. Battery is good of course.

The remote key / alarm seems to work correctly.

First thing i did was to plug my PST2 in the diagnostic socket to pull out some eventual error codes.

By the way, I read somewhere that if the driveblock system works, the car cannot be scanned; do you know if it's true?

However, i went through the car with the PST2 but the diagnostic of the DME end Alarm units / immobiliser came free of any fault code.

After that, i changed the DME relay; didn't changed anything

I tested the pins from the DME relay socket, and i found out that no signal shows up when the key is turn on position 2(ignition).

I took appart the ignition switch and tested it; the unit worked fine. I had for that to dismantle half the car (you need to take appart the knee protection trim ; what a pita).

I put off the seats and had a look on the alarm unit on the passenger side and the driveblock on the driver side, i checked the connections and interior circuits without any clue of damage.

I'm now waiting for next week to be able to switch the driveblock and alarm units from another 993 to see if it would come from there.

I'm for now really thinking about a Driveblock / alarm unit failure.

If this doesn't change anything, i wouldn't know what to do next...

What do you think?

Any idea or suggestion is welcome!

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the car is a 1996 carrera convertible with manual transmission.

The car has the OBD2 diagnostic system.

the steering wheel is on the left(it's an american model)

993 618 159 02 anti drive off (driveblock system) unit 315mhz

928 618 260 03 alarm system

Everything is stock; no aftermarket alarm; the DME is original

the airbag system is present and all stock; no error code

i only have one remote key; hope this is not the problem

when the ignition is switched on, the car doesn't crank at all, and the dme relay doesn't work; exactly like when the driveblock system works after 1 min off with doors left open.

i was before able to start the car half the time; but now it seems to have totally die.

Regarding the emergency log in code for the drive block system, i'm not familiar with this. Is this a code you can enter via the PST2?

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the immobo is coded by a manual procedure using the key, you can't swap parts from car to car.

I have a test plan somewhere, just can't find it right off.

no on board diagnostics on the system.

you need to find a tech with experience on this system or you will be paying to train them

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