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Have tidied/combined this how-to up


Whenever a vehicle battery has to be disconnected, you MUST follow the following procedure to ensure that the BSI is not corrupted.

1. Make sure the battery is easily accessible. i.e. open bonnet if in engine bay, open cover if under floor/seat/in boot etc. [807 is under floor]

**SPECIAL NOTE: If you have a 607, it can have two batteries. The second battery is located in the boot under the RHS boot trim. This battery powers all the vehicle’s systems. The front battery is for starting only. A single red 50 amp maxi fuse, located to the left of the engine management ECU, connects the second battery to the vehicle. This fuse must be removed as well as the front battery connection to disconnect battery power on these vehicles. There is also a maxi fuse at the battery end under the boot trim. This is not accessible without removing the trim but the connections to the fuse holder should be checked if power is lost to the front of the vehicle.

2. Lower the driver’s window. [It is necessary/preferable to have window down when reconnecting the battery, refer to battery reconnection procedure listed below].

3. Switch off the ignition and remove the key.

4. Switch off/disconnect all equipment connected to the vehicle. This includes any diagnostic equipment plugged into the diagnostic port, interior lights, aftermarket radios/amps, alarm systems, trackers, dashcams etc. [You may have to remove fuses/unplug items to achieve this].

5. Wait a full 3 minutes before disconnecting the battery. HINT: before disconnecting the battery, check that the mileage display in the instrument cluster is off. [If it is still on, do NOT proceed as something is keeping the BSI live]. During this waiting period, do NOT operate any equipment on the vehicle. Remember, even opening the bonnet on a vehicle fitted with an alarm with a bonnet switch will wake the BSI, as will operating any remote ‘plip’ keys near the vehicle.


Unless otherwise instructed by Product Service, you must always carry out the following battery reconnection procedure, often referred to as a "soft re-boot", to minimise the possibility of the BSI corrupting its own software.
Ensure the procedure for battery disconnection has been adhered to and importantly all BSI functions were switched off with the driver’s window left down.

1. Close all doors. [driver's door should have window down. If not, see note 2 below.]

2. Remove ignition key if left in ignition.

3. Reconnect battery. Do NOT open any doors.

4. Wait 10 seconds.

5. Switch on headlights through the driver’s window (you will hear a "bong") (note: Snap-on says Side-lights).

6. Switch on ignition then start the vehicle and check system functions.

NOTE 1: Upon reconnection, if any vehicle function controlled by the BSI is active [i.e. if the interior light is switched on via the door being open], the internal operation of the BSI has the potential to spike or corrupt its configuration and software program.

NOTE 2: If the driver's window is not open, you can overcome this problem by putting the driver's door latch into the closed [latched] position with a screwdriver. This will mimic the door being closed and the interior light switch will be deactivated [in most models the door latch controls the interior light]. **Note**Once the BSI is reactivated, you must unlatch the door latch by lifting the door handle otherwise you will not be able to close the door properly. [if you are not sure what to do here, check this www link..]
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