Cobra Electronics Automobile Alarm 7928 User Manual

USER INSTRUCTIONS  
BACK  
Innovative  
Car Alarm  
Thatcham M.I.R.R.C. Evaluation No:  
TC2-1065/0199  
 
Your Cobra Dealer will be pleased to clarify  
any queries you may have with the system  
or its operation.  
IMPORTANT WARNING  
The Cobra 7928/26/HF Alarm Immobiliser  
is a Category 1 MIRRC Thatcham listed  
security system. If the installation of this  
product is modified or altered from the  
standard specifications, or non compliant  
accessories are fitted, the insurance  
approval will be invalidated.  
Even when using your Cobra 7928/26/HF  
Alarm System we would suggest the  
following additional precautions:-  
l Avoid leaving valuable belongings in  
the car particularly if they are on view.  
l Never leave Registration or Insurance  
Documents in the car.  
l Never leave spare keys in the car.  
User Instructions  
l Always try to park in a well lit and safe  
Congratulations on purchasing a Cobra  
7928/26/HF Alarm System. It has been  
designed and manufactured to the highest  
standards utilising the latest S.M.D.  
technology for total reliability.  
area.  
PIN Code  
Each Cobra 7928/26/HF Alarm System has  
a unique PIN code which can be used for  
Emergency Disarm and is required,  
together with one of the emergency  
override touch keys, for programming  
replacement or additional radio keys.  
All round protection is ensured with:-  
1. Passenger compartment protection  
using ultrasonic sensors (7928) or  
hyperfrequency radar sensors  
(7928HF).  
2. Multi-circuit engine immobilisation -  
operates immediately the system is  
armed, or passively 60 seconds after  
ignition is switched OFF and the driver's  
door opened, or 255 seconds after  
ignition OFF if the doors are not  
opened.  
Your PIN code is given on the card  
supplied with your Cobra 7928/26/HF  
Alarm System together with the serial  
number of the system itself. Please keep  
this card in a secure place - not in the car -  
and also make a note of these numbers for  
any second driver’s use.  
Without the PIN code and emergency  
override touch key no additional or  
replacement radio keys can be  
programmed into the system.  
3. Peripheral protection to doors, boot  
and bonnet using direct contact  
switches.  
4. Personal protection - remote control  
‘panic' button on radio keys.  
Many of the security functions are  
integrated with your vehicle's electrical  
system and we recommend that you read  
the complete instruction booklet to ensure  
trouble free operation.  
Also for your added safety, each system  
contains circuitry to ensure the alarm  
cannot be switched on when the vehicle's  
engine is running.  
Button Button  
Radio Key Function  
‘A'  
‘B'  
Arm  
l
Disarm  
l
l
Siren Interrupt  
Panic Alarm  
l
l
Ultrasonic Sensor exclusion  
(within 20 seconds of arming)  
1
 
Radio Keys  
The security system is operated by remote control radio keys. Two radio keys are  
supplied with each Cobra 7928/26/HF Alarm System. Always press the button for a full  
ONE SECOND to allow the whole code to be transmitted. The small LED on the radio key  
will flash whilst the button is held down. The Radio Keys should normally operate up to  
3 metres from the car but range can be affected by other radio signals in the vicinity.  
The Radio Keys are powered by a long life 3v Lithium battery  
(type CR2032 or equivalent). With normal usage a new battery  
should last between 3 and 5 years. Replacement batteries can  
be obtained from your Cobra Dealer.  
Low Radio Key  
Battery  
Indication  
If the small LED on the radio  
key flashes irregularly or only  
once when the operating key  
is pressed, instead of flashing  
continuously, this indicates a low  
battery.  
3. Wait for 10 seconds before inserting the  
new battery, ensuring the correct polarity  
(+ sign upwards) and holding the battery by  
the edge.  
Battery Replacement  
4. Close the case firmly making sure locating  
studs are correctly positioned to ensure a  
waterproof seal is made.  
1. Open the case as shown in the  
diagram - levering the two sides  
apart in the area marked OPEN on  
the key case.  
5. The remote key should now operate  
normally, but it may require re-  
synchronisation with the main control unit.  
2. Remove the old battery as shown.  
Testing the Remote Key & Re-synchronisation  
If, at any time, the remote key does not operate the system, stand close to the car and  
press and hold down both buttons until the LED on the remote key goes out -  
approximately 10 seconds. Release both buttons - the LED will come on constantly. Then  
press button ‘A' for approximately 1 second - the LED will flash - this should complete re-  
synchronisation.  
In case of difficulties please consult your Cobra Dealer.  
2
 
Additional/Replacement  
Radio Keys  
Passive Immobilisation  
The System will automatically arm the  
double immobilisation 60 seconds after  
the ignition is switched OFF and the  
driver's door is opened. If the doors are  
not opened the delay is extended to 255  
seconds after the ignition is switched OFF.  
The radio keys for your Cobra 7928/26/HF  
Alarm System have a ‘protected self-  
learning' feature which allows up to four  
Radio Keys to be programmed into your  
system by using its unique PIN code in  
conjunction with the electronic touch keys.  
l The LED will flash.  
All existing radio keys and touch keys  
must be re-programmed at the same time  
as any additional or replacement keys are  
being introduced to the system. Your  
Cobra Dealer will be able to carry out this  
procedure for you.  
It will not now be possible to start the  
engine, but in this instance the doors will  
not lock and the windows etc. will not  
close. The door trigger circuits and interior  
sensor do not arm.  
DRIVING THE VEHICLE  
To start the engine, ensure the ignition is  
switched OFF then disarm the immobiliser  
by pressing button ‘A’ on the radio key and  
then switch ON the engine within 255  
seconds.  
Arming the System  
Radio Key - pressing the operating button  
‘A' will arm the system, indicated by:-  
1. Two flashes of the vehicle's hazard  
lights.  
To fully arm the system after passive  
immobilisation, switch OFF the passive  
arming by pressing button ‘A’ on the radio  
key, then re-arm the system (as described  
in ‘Arming the System’).  
2. Continuous flashing of the LED  
warning light.  
3. Simultaneous locking of all doors.  
l Immediately the alarm unit is switched  
ON (‘armed') the vehicle is  
immobilised.  
Emergency Override  
Touch Key  
The emergency override touch key can be  
used to disarm/ de-immobilise your Cobra  
7928/26/HF Alarm System in the event of  
lost or damaged radio keys. If your car is  
locked use your door key to enter the car  
and touch the Emergency Override Touch  
Key on the contacts of the touch receptacle  
- this will disarm and de-immobilise the  
security system. If the system was fully  
‘armed' the siren will sound until  
After switching ON (‘armed') a period of  
approximately 45 seconds will elapse  
before the system is fully active. (This is a  
‘setting-up' and ‘test period').  
When the alarm is fully active it will be  
triggered by:-  
1. Opening a door, boot or bonnet (Direct  
Contact Switches).  
2. Movement within the vehicle  
(Ultrasonic).  
disarming has taken place. The car can  
then be started in the normal way.  
When triggered the Electronic Siren will  
sound at 118dB and the hazard lights will  
flash for 30 seconds - at the end of this  
l Up to four Emergency Override Touch  
Keys can be programmed into each  
Cobra 7928/26/HF Alarm System.  
3
 
period the system will close down and  
automatically re-set to provide protection  
against a further attempt by an intruder to  
enter the vehicle.  
Siren Interrupt  
Pressing button ‘A' whilst the siren is  
sounding will turn the siren off. The Alarm  
System ‘status' - i.e. ‘armed' - will not be  
changed.  
Disarming the System  
On return to the vehicle, pressing  
operating button ‘A' on the radio key will  
disarm the system. This is indicated by:-  
Panic Alarm/  
Personal Protection  
1. One flash of the hazard warning lights.  
Pressing the auxiliary button ‘B' will sound  
the siren for 10 seconds when the alarm  
system is in the ‘armed' state.  
Note: If the system has been triggered  
during your absence the hazard lights will  
flash 4 times and the buzzer will sound 4  
times.  
Note: This function will not be operational  
during the 40 seconds set-up time  
required for the system to become fully  
active after it has been ‘armed'.  
2. Extinguishing of the LED warning light  
- see note.  
3. Unlocking of all doors.  
Note: If the alarm has been triggered in  
your absence a ‘status history' will be  
displayed by the LED warning light and is  
indicated as follows:-  
Volumetric Protection  
Exclusion  
Ultrasonic Sensor (7928):  
Single pulse flashing of LED: One  
alarm state caused by opening of the  
boot, bonnet or doors.  
To arm the system without utilising the  
Ultrasonic interior sensor, press the  
operating button ‘A' in the normal way  
then, within 20 seconds, press the  
auxiliary button ‘B'. This allows all other  
protection circuits to remain active whilst  
windows can be left partially open (for a  
dog inside the vehicle etc.). This command  
is indicated by a ‘beep' from the siren.  
Twin pulse flashing of LED: One  
alarm state triggered by accessory  
hyperfrequency radar sensors  
(7928HF).  
Triple pulse flashing of LED: Alarm  
state triggered by the ultrasonic  
sensor or optional glass break (7928).  
Quadruple flash repeated regularly:  
Alarm state caused by an attempt to  
start the car.  
Note: This display can also show multiple  
triggering and other system diagnostics -  
please consult your Cobra dealer in case of  
any difficulties.  
Illuminated Entry  
On disarm the system will switch ON the  
courtesy light for 30 seconds, or until the  
ignition is switched ON.  
This display is extinguished when the  
ignition is turned on.  
4
 
Trouble Shooting  
Checking the Alarm  
System  
Your Cobra 7928/26/HF Alarm System  
should have been installed by a fully  
trained technician. In the unlikely event of  
a problem occurring with it please contact  
your supplying/installing Cobra Dealer for  
assistance. If this is not immediately  
possible the following notes may be of  
help:-  
You should check your Cobra 7928/26/HF  
Alarm System on a regular basis - once a  
week is recommended.  
1. Direct Contact Check: Arm the system  
and exclude the ultrasonic sensors -  
wait 45 seconds.  
Symptom: Radio Key will not ‘arm' or  
l Opening any of the vehicle doors, boot  
or bonnet will trigger the system and  
the siren will sound. Disarm the system  
from the radio key and repeat the  
process for each door, boot and  
bonnet.  
‘disarm' system.  
l The Radio Key battery may be flat (see  
notes on Low Battery Indication and  
Changing Battery).  
Symptom: The radio key may require  
re-synchronisation.  
l See Testing the Remote Key and Re-  
2. Ultrasonic Sensor (7928) /  
Hyperfrequency Radar Sensor  
(7928HF) Check:  
synchronisation section.  
Symptom: Alarm has triggered for no  
apparent reason.  
Whilst remaining seated in the car with  
doors and windows closed - Arm the  
system and wait 45 seconds.  
l When you ‘disarm' the alarm the  
diagnostics code will be displayed by  
the LED warning light. If direct contact  
triggering is indicated then switches in  
doors, boot or bonnet may need  
adjusting - please consult your Dealer.  
If showing Ultrasonic triggering please  
check that all windows, sunroof and air  
vents are closed and ensure that there  
are no loose moving objects (or  
l Rapid movement of your arms should  
trigger the system. Disarm in the  
normal way.  
If at any time your alarm does not appear  
to be operating correctly please refer to the  
‘Trouble Shooting' section or, if in any  
doubt, contact your supplying/installing  
Cobra Dealer.  
animals) left in the vehicle. If the  
problem persists contact your Cobra  
Dealer for assistance.  
Pt. No. 908 001A  
Rev. 06/01  
 

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