Service manual

CANDoo Professional
90
The DESS keys/lanyards contain two distinct critical parts:
 A powerful magnet
 A microchip with a 64 bit serial number
The DESS post on the vehicle contains a reed switch, a center post, and a grounding ring around
the outside of the post. When a DESS key is inserted on the post, the magnet in the key closes the
reed switch in the DESS post. This "wakes up" the MPEM from hibernation, and the MPEM sends
out a signal on the center of the DESS post. Since the DESS key makes contact with the center
lug and the grounding ring, it sees this signal from the MPEM, and it sends its internal serial
number information to the MPEM. The MPEM compares this serial numbers to the serial numbers
contained in its internal list of keys.
If the serial number of the key matches one contained in the MPEM internal list of key serial
numbers, the MPEM gives the 2-beep signal and allows the operation of the vehicle. However, if
the serial number does not match, it gives the single long beep, and does not allow operation of the
vehicle.
The MPEM for 2-stroke Sea Doo's allows storing up to 8 key serial numbers in its list. CANDooPro
allows you to manage the list of keys, to add new keys up to a total of 8, and to erase keys.
The carbureted 2-stroke skis only have one type of key function available (Normal Keys). Please
note that ALL Sea Doo DESS lanyards are identical internally. They simply use a different color
float for the different function keys, (Normal Keys are Yellow, Learning Keys are White, Rental
Keys are Orange). You can use any kind of key for any purpose. For example, you can use a
White Learning key for two stroke carb skis, as it will be programmed in the MPEM as a Normal
key.
3.1.2.1.2.2.2.2 Testing Keys
CANDooPro > Vehicles > Sea-Doo Watercraft > 2 Stroke RFI Models(See 3.1.2) >
Early RFI Models (1998-2004)(See 3.1.2.1) > Working with CANDooPro(See
3.1.2.1.2) > Diagnostic Session Details(See 3.1.2.1.2.2) > Keys Tab(See
3.1.2.1.2.2.2) >
Testing Keys
(See
3.1.2.1.2.2.2.1)
(See
3.1.2.1.2.2.2.3)
Testing Keys:
To test if the microchip in the key is good, you can use the Test Key function of candoo.
To test a key:
 Insert the key you wish to test on the DESS post mounted to the CANDooPro box