Step by step...
1. With the ignition key ON and the security system disarmed, enter the setup menu by pressing and holding the Toggle and Mode switches for five seconds.
2. Press the Mode switch to advance to the SERVICE COUNTER menu item.
3. Press the Toggle switch to display MODE TO RESET.
NOTE: Pressing the Toggle switch again will exit the Service Clear menu item without resetting the service odometer. A SERVICE NOT RESET message will be displayed.
4. To reset the service odometer, press the Mode switch. A SERVICE RESET message is displayed.
5. The setup menu will advance to the next menu item. To exit the setup menu, click the Mode switch until the Exit menu item is displayed. Click the Toggle switch to exit the setup menu.
I hope this works for you, this is pretty much verbatim as per the maintenance manual. Without the figure pictures of course.