Alarm system diagnosis 911 Carrera (996)
Door lock barrel: Actuated towards open
not for coding variant "deactivate only via radio", if alarm system is activated
Radio transmitter: actuated once
- no valid transponder
Desired locked position is not achieved
Controlling the interior lights
The interior lights are not controlled directly by the door contacts. The interior lights
When the central locking system is unlocked with a key or via radio transmitter.
When the doors are opened.
When Term. S is switched off.
The lighting stays on for approx. 30 seconds.
The interior lights are switched off (doors closed):
30 seconds after the central locking system is unlocked with a key or via
30 seconds after the last open door has been closed with Term. 15 and Term. S
When the last open door has been closed with Term. 15 and Term. S switched on.
When the central locking system is actuated toward position locked or safe via handheld transmitter or door lock barrel and with both doors closed.
When the last door has been closed, if one door was still open when the central locking system was actuated toward position locked or safe via handheld transmitter or door lock barrel.
The interior lights are switched on and off dimmed.
Opening and closing the convertible top of the 996 Cabriolet
The second button of the handheld transmitter can be used as a remote control for the convertible top provided that:
Vehicle is unlocked and deactivated and
Term. S is switched off for at least
Term. 15 is switched off and
If the convertible top is opened or closed, the convertible top control module output is activated first and then (with a 200 ms delay) the comfort opening or comfort closing output.
If both doors are closed with Term. 15 and Term. S switched on.
Load disconnection if the vehicle is locked up, some loads are disconnected from the supply voltage in order to conserve the battery. Load deactivation is activated if at least one of the following requirements is fulfilled:
10 minutes after locking up the vehicle via hand-held transmitter or door lock as well as after re-locking
2 hours after term. S is switched off
2 hours after the central locking system is unlocked via door lock or hand-held
2 hours after alarm output
If the central locking system is actuated 11 times in less than 5 seconds, further operation is blocked for 30 seconds. If the last command before play prevention activation was a command to open the central locking system, then it is possible to give a further command which is independent from play prevention to close the system. For every further time that play prevention is activated the blocking time is doubled, up to a maximum of 240 seconds. The blocking time is cleared when a door is opened, and if play prevention is activated again, blocking time starts at 30 seconds.
The airbag control module emits a signal to the alarm system control module no later than 35 seconds after Term. S is switched on and until Term. S is switched off again. This signal has a frequency of 10 Hz and indicates two states - normal state (live signal) and crash state. The two states differ in the pulse/duty ratio of the signal:
Live signal 20% high 80% low
Crash signal 80% high 20% low
Signal evaluation begins 45 seconds after term. S is switched on. If no signal is detected from the airbag control module, a corresponding fault is entered into the fault memory.
If the battery voltage falls below 8.5 V, undervoltage occurs. If the battery voltage exceeds 9 V, the undervoltage is no longer present. If undervoltage occurs, the inputs Door lock barrel open and Door lock barrel closed are evaluated as inactive irrespective of their state. It is not possible to activate the central locking system via the door lock barrel when undervoltage occurs. The alarm system cannot be activated in the case of undervoltage.
Electric locking of the rear lid release has been omitted as of the production launch of the '98 series. Front lid release locking is still carried out electrically.
Electric locking is carried out by the alarm system control module and is valid for the following country codings:
USA, England and Belgium
Load disconnection is deactivated if at least one of the following requirements is fulfilled:
Term. S is switched on
Term. 15 is switched on
A valid transponder is recognised
The vehicle is unlocked or locked via hand-held transmitter or door lock
A door is opened
The control centre not only enables power-window control, but also controls the comfort functions. If the central locking button on the hand-held transmitter is still pressed after an unlocking command has been given, the windows are controlled in the direction open. For a locking command with the central locking button on the hand-held transmitter, if the button is still pressed, the windows are controlled in the direction closed (national variant).
After the operating voltage is switched on, the system is set to the operating state which it was in before the supply voltage was switched off.
For this purpose, all necessary operating parameters are stored in a permanent memory. If the system was disconnected from the supply in the armed state, this is entered as a fault in the status memory. The same applies if the system is disconnected from the supply voltage during an alarm output. The alarm output is continued as soon as the necessary supply voltage is available.
Activating and deactivating alarm system
The alarm system is activated by a ground signal at the activation input or by an activation signal from the hand-held transmitter.
The activation of the system is ignored if terminal 86 S, terminal 15 or a valid transponder key is recognised.
If for some reason it is not possible to lock the central locking system with a single locking command, the alarm system is not activated. Activation of the alarm system cannot be achieved until the central locking system is locked (if necessary manually) and a new activation command is issued or only locking is performed three times in quick succession. The interval between two locking operations must not be more than 1 second in this case. If the system is activated by this emergency function, the central locking system is locked without checking whether it can be completely locked.
The system saves the type of activation in a status memory. If an alarm is triggered, this information is written into the alarm memory together with the alarm coding.
When the alarm system is activated, the inactive level of all inputs is checked for an inactive period of 10 seconds. Only inputs which are inactive for the entire inactive period can trigger the alarm after the end of the inactive period. All other inputs are blocked for alarm triggering for as long as they are in the active state. If the inactive state occurs at blocked inputs, the inactive period is started for them individually. All inputs which remain in the inactive state during the inactive period are then included
The inactive period commences immediately if it is apparent that the central locking system is locked or if locking occurred three times in succession and if the signal "activate " is no longer present. (A second activation command for cancelling the anti-theft protection restarts the inactive
In the case of an active signal at the inputs terminal 86 S, terminal 15 or if a valid transponder key is recognised, no activation is possible. If one of these inputs is active at the time of locking, control of the central locking system does not take place. The central locking system is opened if one of these inputs becomes active during the inactive period, since in this case the alarm system is also deactivated.
If, when the vehicle is locked, a door is unlocked after expiry of the 10 second inactive period, this is immediately controlled in the direction "closed". An alarm is triggered at the same time. If, when the vehicle is locked, a door is unlocked from the inside during the inactive period, the central locking system is unlocked and the alarm system is deactivated. (Protection against unintentional locking/activation).
If, within 15 seconds after switching-on of the output External Electronics, movements in the vehicle are detected by the passenger compartment monitor, the central locking system is moved to the locked position and the alarm system is deactivated.
After expiry of the inactive period, the output "External Electronics" is switched on if the alarm-triggering inputs for the doors, convertible top, convertible top compartment cover, front luggage compartment and rear engine compartment were inactive for the entire inactive period. If one of these inputs is active, the output "External electronics" is not switched on until this input becomes inactive and remains in this state for at least 10 seconds. The switched-on output "External Electronics" cannot be deactivated again by activating one of the above inputs. The output is switched off when deactivation takes place.
If, within a period of less than 1 second after the first activation pulse, a second activation command is issued, the output "External Electronics" is not switched on for one activation cycle. In this case, the central locking system is not secured, but only locked. This is acknowledged by signal 1 at the alarm horn and at the direction indicator light output, as well as during
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