Installing Passive Belt Power Cut Off Relays

Important

The purpose of this relay system is to eliminate the minor current draw of the passive belt system when the car is not running. While the current draw is minor, it is sufficient enough to completely discharge the battery in some cases if the car has not been started or run after a week or more. This relay kit should not be used to correct mechanical problems with the passive belt system. They must be corrected first!


This procedure is easier if you remove the rear seat bottom from the car.





1. Position the relay holder on the left sill just forward of the rear seat support beam so that the relays are laying on their side and pointing toward the front of the car.

2. Using a center punch mark both relay bracket holes on the sill. Remove the relay bracket and drill both holes. diameter 3.5 mm (9/64")

3. Install the relay bracket using the two (2) torx screws provided in the kit.





4. Unscrew the key buzzer and relays from the rear seat support beam to allow easier access to the 3-pole connector below them.





5. Route the cable harness from the relay holder across the front of the seat support beam. Tie strap it securely to the bottom of the seat hinge bracket behind the G-Force sensor.





6. Route the harness containing the heavier gauge wires under the seat support beam and around to the back side of the passive belt relays.





7. Remove the fuses from the passive belt relay holders. With a volt meter find the hot side (+30) of both fuses.





Disconnect the negative battery terminal

8. Remove the two (2) +30 wires from both fuses holders. Cut off the two (2) connectors and remove enough insulation to connect both wires to the red wire (2.5 sq.mm) wire from the relay kit using the butt splice provided. Crimp these wires together.





9. Install the two (2.5 sq.mm) gray wires from the relay kit into the two open passive belt fuse positions. Install the fuses.





10. Unplug the three pole connector just in front of the rear seat support beam. Remove the male pin # 3 (green/white). Cut and remove the pin.
11. Remove the insulation from the end of the green/white wire and the green/ white wire from the relay kit. Install the male spade terminal provided onto both wires and install the pin into position 3 of the 3-pole connector. Plug the 3-pole connector back together.





12. Install the ring terminal of the black ground wire onto the torx head system ground screw located on the rear seat support beam.





13. Install the two relays previously removed in step 4 back onto the seat support beam.





14. Remove the 25-pole connector from the passive belt ECU.

15. Remove the 3 screws and open the 25-pole connector exposing the pin connectors. Slide the white plastic locks back on both sides of the connector and remove them.

16. Feed the orange and the white relay kit wires through the outer 25-pin housing.

17. Remove pin # 24 (orange) and cut off the pin. Remove the insulation from the end of this wire and the orange wire from the relay kit. Install the pin connector provided onto both wires and insert this pin back into position 24.

18. Remove pin # 7 (white) and cut off the pin. Remove the insulation from this wire and the white wire from the relay kit. Install the pin connector provided onto both wires and insert this pin back into position 7.

19. Install the two (2) white locking pieces. Reassemble the 25-pole connector. DO NOT FORGET THE GASKET.

20. Plug the 25-pole connector back into the ECU.

21. Install the rear seat bottom. Connect the negative battery cable. Test the passive system and make sure it works correctly.


Note:
This relay system was designed to shut off power to the passive belt system approximately 10 minutes after you turn the car off, close the door and leave the car. However, if you were to measure for 12 volts at the system fuses you will still show a voltage after 10 minutes. This residual voltage is stored in capacitors in the passive belt ECU and will gradually decrease to 0 volts over time. The relays however, will not allow any current to be drawn from the battery. The passive belt system will be energized again as soon as you open either front door.