Cobra Electronics 7928 User Manual

USER INSTRUCTIONS

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USER INSTRUCTIONS

Innovative

Car Alarm

Thatcham M.I.R.R.C. Evaluation No:

TC2-1065/0199

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.

User Instructions

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.

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.

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.

Your Cobra Dealer will be pleased to clarify

any queries you may have with the system

or its operation.

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.

l Always try to park in a well lit and safe

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.

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.

Radio Key Function

Arm l

Disarm l

Siren Interrupt l

Panic Alarm l

Ultrasonic Sensor exclusion

(within 20 seconds of arming)

1

Button Button

A' B'

l

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

Radio Key

(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.

Battery Replacement

1. Open the case as shown in the

diagram - levering the two sides

apart in the area marked OPEN on

the key case.

2. Remove the old battery as shown.

3. Wait for 10 seconds before inserting the

new battery, ensuring the correct polarity

(+ sign upwards) and holding the battery by

the edge.

4. Close the case firmly making sure locating

studs are correctly positioned to ensure a

waterproof seal is made.

5. The remote key should now operate

normally, but it may require re-

synchronisation with the main control unit.

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

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.

l The LED will flash.

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.

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).

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

disarming has taken place. The car can

then be started in the normal way.

l Up to four Emergency Override Touch

Keys can be programmed into each

Cobra 7928/26/HF Alarm System.

Additional/Replacement

Radio Keys

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.

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.

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.

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.

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).

When triggered the Electronic Siren will

sound at 118dB and the hazard lights will

flash for 30 seconds - at the end of this

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.

Disarming the System

On return to the vehicle, pressing

operating button A' on the radio key will

disarm the system. This is indicated by:-

1. One flash of the hazard warning lights.

Note: If the system has been triggered

during your absence the hazard lights will

flash 4 times and the buzzer will sound 4

times.

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:-

Single pulse flashing of LED: One

alarm state caused by opening of the

boot, bonnet or doors.

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.

This display is extinguished when the

ignition is turned on.

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.

Panic Alarm/

Personal Protection

Pressing the auxiliary button B' will sound

the siren for 10 seconds when the alarm

system is in the armed' state.

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'.

Volumetric Protection

Exclusion

Ultrasonic Sensor (7928):

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.

Illuminated Entry

On disarm the system will switch ON the

courtesy light for 30 seconds, or until the

ignition is switched ON.

4

Trouble Shooting

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:-

Symptom: Radio Key will not arm' or

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-

synchronisation section.

Symptom: Alarm has triggered for no

apparent reason.

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

animals) left in the vehicle. If the

problem persists contact your Cobra

Dealer for assistance.

Checking the Alarm

System

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.

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.

2. Ultrasonic Sensor (7928) /

Hyperfrequency Radar Sensor

(7928HF) Check:

Whilst remaining seated in the car with

doors and windows closed - Arm the

system and wait 45 seconds.

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.

Pt. No. 908 001A

Rev. 06/01