Honda have issued the follwing TSB#HUK000000000204 dated 29-03-2003 for the AP1 for the following year models 2000,2001,2002 & 2003. S2000 CAT1 Ultrasonic Alarm Test Procedure The installation of a CAT1 Ultrasonic alarm system to any "soft top" vehicle requires careful adjustment. To ensure the vehicle is suitably protected from attack the ultrasonic detectors must activate as the result of entry to the cabin, whilst not being set too sensitively as to cause "false" alarms during heavy rain or windy conditions. To this end all Honda S2000 CAT1 alarms should be set up as per the attached "factory fit" test procedure. In the case of Honda S2000 units now supplied with the CAT1 Ultrasonic alarm as standard, this procedure must also be used to check the alarm operation at PDI. We also recommend the operation of the alarm be explained during sales hand over to the customer, paying particular attention to the alarm sensitivity. Installation Instructions Ultrasonic Supplement In order to meet the Thatcham criteria, the ultrasonics on all S2000 models must be set up in the following manner: Initially, set the ultrasonic adjustment, so that the adjuster is at approximately 11 o’clock. Loosely replace the driver’s seat. With the roof, windows and both doors in the closed position, turn the alarm system on. After 3 minutes, with a moderate force, tap on the roof and then the rear window. The alarm should NOT sound. Turn the alarm system off. Sit inside the vehicle, (in either seat) and turn the alarm on – again with the roof, windows and doors closed. Sit completely still for 3 minutes, to allow the ultrasonics to set up and then move around inside the vehicle. In this situation the alarm SHOULD sound. If the above two parameters are not achieved, the ultrasonics will need further adjustment to achieve the correct set up and operation. Please refer to the alarm fitting instructions for adjustment details. For information, increase the sensitivity of the ultrasonics by rotating the adjuster clockwise and decrease by rotating the adjuster anti-clockwise. NB It is essential that the sensitivity of the ultrasonics are not set too high, so that false alarms occur whilst it is raining, for example. Equally, the setting should not be too low, as to leave the vehicle vulnerable.