Right Rear Level Sensor
 

Greetings all, Spring is around the corner in the Northeast so it’s time to pull the non-beaters out of storage and start the ongoing e53 and e39 repair and maintenance activity. On my ‘05, 78K mile, 4.8is I am getting a code indicating the auto leveling headlights are inop. Further code reading points to the rear level sensor which I understand is performed by the right sensor.

I have no codes related to the vehicle height system and, in fact, the system is working fine after replacing all four bags a couple of years ago; height is good, basically zero leaks, no unnecessary pump activity (actually no pump activity other than the first start in the Spring).

The questions:

1) What could cause the headlight leveling system to be inop and pointing to the rear sensor if the vehicle height itself is fine?
2) If I replace the right rear height sensor, will I need to adjust the vehicle height?
3) Should I just leave it alone since the headlight aim is good but doesn’t do its up/down dance when I turn the lights on? I realize I lose the auto adjust benefit but unless I tow that does not appear to be a problem at this point.

Generally, I want all systems to work 100% but am not interested in upsetting ride height control system to eliminate the light related error code and have auto adjusting headlights.

Thoughts appreciated.

Thanks

Steve


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Rear right level sensor works for both light aim and suspension setting. The sensor has two separate circuits in the same housing individually for both systems. The wiring for both circuits is also separate. It could be the sensor itself or wiring failed. With diagnostics you can see what height/voltage both circuits are showing. If you really want to test you could change the pin assignment on the sensor so light aim level and suspension level is mixed.

Right Rear Level Sensor
 

Replaced the sensor, problem solved. Thanks again for the help Clavurion.


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