Passive Belt System Power Circuit

The passive belt system used on certain 1987-89 900 models draws a minor amount of electrical current when the car is parked. In certain cases this current draw may be sufficient to completely discharge the battery if the car has not been driven for a week or more, depending on the total current draw of all the systems in the car and the condition of the battery.


To remedy such cases where the minor current draw results in battery discharge, a kit has been developed which includes a time delay relay to cut off power to the passive belt system approximately 10 minutes after switching off the ignition.

PSI 12/91-0166 introduces the passive belt relay kit, has the installation instructions attached for reference and includes two additional steps that were not in the instructions.