Vodafone Automotive & Cobra alarm troubleshooting
If your car alarm has gone off you’ll probably want to know what has caused it to happen. This way it can be repaired if damage has occurred, or be put right if there is an issue with a faulty sensor.
Alarm fault code display
Vodafone Automotive, and Cobra alarms with a siren will notify you of a trigger event when you disarm by a beeping of the siren. (Note that if you have arm/disarm chirps activated the beeps will be in addition to the normal disarm notification beeps).
At this stage open a door to prevent the alarm from re-arming and get into the vehicle to count the LED flashes. on the LED Control Panel. The number of flashes represents your alarm fault code.
Note: Do not turn on the ignition as this will clear the fault code until the next time the alarm is triggered
LED flash count
When you disarm the alarm, the LED on the control panel will flash a number between 1 and 7 to indicate the alarm fault code.
(There are higher numbers, but these are rare and typically used for technical installation purposes. or the new 482X Series of alarm which are explained here)
Alarm fault code example:
If the bonnet sensor has triggered the alarm, the code will be 3. The LED will flash 3 times, pause, then flash 3 times again, repeating this sequence.
If more than one fault code is stored, the alarm will flash each code in turn, then repeat the sequence.
Vodafone Automotive & Cobra Alarm LED Flash Codes
Note: The Codes are form all models except the new 482X Series
| LED Flashes | Trigger Source |
|---|---|
| 1 Flash | Driver’s door |
| 2 Flashes | Ultrasonic/volumetric sensor (interior) |
| 3 Flashes | Bonnet |
| 4 Flashes | Ignition switched on |
| 5 Flashes | Boot opening detection (Additional sensor AB3868) |
| 6 Flashes | Door opening detection (not used on all alarms) |
| 7 Flashes | Additional sensor |
| 8 Flashes (or more) | Technical installation code |
Tip: The LED will repeat the code several times, so you don’t need to count perfectly the first time.
No alarm fault code?
If your alarm has the 5385 wireless siren (found with the AK4615 and AK4698 models), you may find the siren sounding without the ECU logging a trigger. Here’s how to diagnose the issue.
1. Check for visual & audible indicators
Hazard lights – See if they flash when the alarm sounds.
Horn – If your horn is wired to the alarm, listen to see if it also sounds.
2. Why This Happens
The wireless siren has a direct bonnet switch input.
This input can trigger the siren independently of the main alarm ECU.
If the bonnet switch is not:
Hard-wired to the alarm ECU, or
Detected via the CAN-BUS,
the ECU will not record it as a trigger, meaning no fault code will be stored.
3. Common Causes
- Low vehicle battery – If the battery is in a poor state of health then this can cause issues, as can poorly connected battery terminals.
Faulty bonnet switch – loose, damaged, or dirty contacts.
Siren-to-ECU communication issue – often resolved with a siren firmware update.Alarm
How to Disarm the Alarm
The PIN procedure is the same for all current Cobra alarms (Pre 2000 models may differ – check your manual).
Check or replace your remote batteries
The following Vodafone Automotive alarms can have the alarm trigger history read via a laptop: AK4615, AK4627, AK4698, 4822, 4824.
Important Battery Check
If you cannot disarm with the remote or override PIN:
Test your vehicle battery – over 80% of electronic alarm issues are caused by low or flat batteries.
When to Call Your Installer
If the above steps don’t solve the issue, contact your alarm installer for a bonnet switch inspection and, if needed, a siren firmware update.
Contact me here if you’re in New Zealand.
Contact Vodafone Automotive UK if you are on the other side of the planet
