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Auto-leveling headlights broken

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Posted by A Sherman on January 4, 2007, 4:38 am

My 2005 Prius (25K miles) has package 4 with the auto-leveling HID lights.
Tonight I noticed that the lights were aimed considerably lower than usual.
Not a hazard to drive, but noticeably lower.  I suspect the sensor might be

I've found some reports of this problem in Priuschat.  Has anyone here had
a problem with the auto-levelers?


Posted by mrv@kluge.net on January 4, 2007, 2:24 pm

A Sherman wrote:

Do realize that the HIDs will point lower if there is more weight in
the cargo area of the car.

Do realize that the headlights are adjustable, so if they are pointed a
little low, you can raise them, as instructed in the owner's manual.
Same if they are pointed a little high and you are always being flashed
by oncoming motorists.

Also realize that there is a known auto-leveling sensor problem on some
2004-2005 Prius.  If you have this problem, you'll know it - the
headlights will only aim up to about 20ft in front of the car, and
you'll get a chime and the autoleveling headlights warning icon on the
MFD.  (Several reports on the Prius-2G yahoogroup and on
priusonline.com )  Problem is that it is intermittant and therefore can
be difficult to get your dealer to believe you that there's a problem
(since it often doesn't store an error code and won't happen in the
dealer's possession).  For more information, see:
US TSB EL004-06
April 28, 2006. Automatic Headlight Leveling System Warning Light "ON"
or Flashing. 2004-2005 Prius w/HID headlights. replace rear vehicle
height control sensor with improved one.

Posted by A Sherman on January 5, 2007, 1:40 pm


Thanks for the reply, mrv.  I have not seen any error code.  My headlights now
cover about 60 ft in front of the car with low beams.

I now recall that the day before I noticed the problem, I had hit a large bump
in the pavement with a couple of heavy passengers in the rear seat.  I'll bet
this could have damaged the sensor.


Posted by A Sherman on January 8, 2007, 12:36 am

Very Strange!

The auto-levelers were definitely broken for 3 or 4 nights, but now they have
resumed working properly.  I will have to watch them to see what happens.
Maybe a loose connection?



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