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2007 - 2017 Lexus GS450h Plug-and-Play Car Harness Installation Instructions

(Click on below image
for larger photo)

We do not yet have full installation instructions for the GS450h.  We are seeking a vehicle to use for a photo session.  Do you have a Lexus GS450h that we can photograph?  If so please contact us.

The image at left shows the hybrid battery high voltage wire connection points. 

To avoid damaging the battery electronics or your Prolong Battery System be sure to connect to the correct location on the battery pack.

(Prius shown for reference)

IMPORTANT - Test the charger before re-assembling the vehicle. We recommend that you connect the charger to the car harness before plugging it into the wall and unplug it from the wall before disconnecting it from the car.

To perform the initial function test: First, make sure all fingers and tools are clear of all wiring and hybrid battery components. Plug the charger into the car harness. With the hybrid battery main disconnect still removed, plug the charger into the wall. After a few seconds, it should read approx 360 volts on the meter and both the charger and hybrid battery cooling fan should be running.

Next, carefully connect hybrid battery main disconnect. One the disconnect is reinstalled, be sure to lock the release ring/handle up and in place to make a good connection.

You should see the charger voltage drop as the charger voltage equalizes with the voltage level of the battery pack. This should happen quickly. The voltage level should be stable and not fluctuating. All fans should still be running.

This completes the test. Unplug the charger from the AC power source and disconnect the charger from the car harness. If the test was successful, you can leave the hybrid battery main disconnect in place.

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Click here for the Prolong Battery Charger User Guide.


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