997 ignition key How does it work ??? 962 project

[GTRCLIVE]

This may seems like a silly question but the 997 loom we are trying to install in the 962 project, exactly how does it work ?? it does not turn like a normal key switch and stay there. Whats the normal sequence insert key then push in further to get normal ignition circuit to come on ??? HELP

[dave87]

I think it is the same as the 987 Boxster. If so, insert Key, flick right once to turn ignition on, then turn to right to start car.

[watercooled]

The clutch has to be depressed during starting (at least in the Boxster 987).

[threespins]

On my 06 C4S the key has to be pushed in to get the ignition on.

[YoungMD]

Yes it's a bit funny, I think mainly as it is spring loaded to return to the centre, so stick it in, turn once it springs back to centre but powers up ignition, then turn again slightly further and hey presto it should start, or not depending on your buildings skills I guess !!

[Daveuxb]

Awesome project👍👍

[Pope]

The igniton switch works in conjunction with the PAS ECU (Porsche Access System) which detects the key via the immobiliser pill within the keyhead (no battery required in the key for this - it is a transponder coil). If the key is recognised - in the original format - the ELV (Steering column lock) is deactivated and term 86S is switched - basic systems and driver information is activated (key is determined and displayed in dash - key 1 / key 2 etc). The ignition switch; when turned fully to the right will either - again originally - switch on the 'ignition' - term.15 or if the switches on the pedal of the clutch (manual) or the brake (tiptronic) are activated term.50 (crank) is activated via the start lock relay. Depending on country of origin and model year you may also have VTS to include too - essentially a 'one-cut' immobiliser.

If your loom retains the OBD port then the Chassis No. programmed into the ECU' s can be read out (assuming you don't already have it) which will enable keys to be coded in the future. The start interlock can also be coded off (remove the coding that looks for the clutch and brake inputs if required).

If you haven't already it will help to ID the ECU's

1. Foreground right; in the tray - Gateway ECU (essentially the central hub of the CAN BUS system that communicates across all BUS speeds)
2. Middleground left; in the tray - Rear Body Control Module - looks after rear lighting and associated systems - spoiler control
3. Centre; going by vicinity to fuse box - PAS/KESSY Module - looks after the aforementioned vehicle access. Used in conjunction with the DME ECU to immobilise the vehicle. To code keys the unit is accessed via Porsche's IPAS system (centrally held codes; programmed at vehicle inception and held on a worldwide system).
4. Behind the Instruments - Front Body Control Module - looks after front lighting and functions (fuel flap lock solenoid for example).

The loom is compact considering the functions - a byproduct of CAN BUS where digital signals are used to transfer common information along two wires to enable activation or control of subsystems without the need for complex and repetitive wiring.

Edited by Pope on Saturday 19th September 21:44

Edited by Pope on Saturday 19th September 21:47