My "service stability system" light has come
on. I was not aware this car had one and am unable to
find information in the operatorís manual. I phoned a
local dealer and was quoted $142, and AAA quoted by
phone $117. Quite a difference.
diagnostic check is needed per dealer. Why? The dealer
said it could be caused by different causes. I donít
understand. After receiving the above message, it seems
they should know the cause. This is a 2005 Buick Park
Avenue Ultra, with 20,720 miles.
Letís start with a quick overview of your vehicle
stability enhancement system.
important safety system utilizes information from
several vehicle systems as well as three dedicated
sensors ó lateral acceleration, yaw rate, and steering
wheel position ó to infer the Buick isnít turning as
the steering wheel has requested. If yaw error, or
incorrect turning, is indicated, vehicle power may be
altered and one front brake applied to bring the car
back on course.
shouldnít be too difficult to resolve; there will be a
diagnostic trouble code stored that will indicate a
specific section of the system to check. The system is
managed by the electronic brake control module, which
sends a message to the instrument panel cluster when a
component or circuit fault is encountered. Since no
other malfunction indicators were illuminated, it sounds
like a fault may be present in one of the three
mentioned sensors or their circuits, rather than
impractical to quote a final price to fix this over the
phone, as a variety of faults could be the cause. The
prices you were quoted were surely just to check and
advise of the repairs needed. The dealerís information
is on target, as a diagnostic test drive and check is
needed to validate and diagnose the trouble code found.
retrieving the diagnostic trouble code, the technician
researches applicable diagnostic aids and conditions
under which the fault can be detected. A careful test of
the steering wheel sensor is performed during a low
speed, straight-line maneuver while observing scan tool
sensor information. The system is next tested without
the scan tool by driving at highway speeds, on various
rough roads and during high steering wheel angle
cloverleaf and parking lot maneuvers, in an attempt to
duplicate the fault and re-illuminate the indicator.
three sensors, while internally quite sophisticated, are
supported by very straightforward circuitry, and are
similar to typical "check engine" light issues
in the way they are tested. Should the lateral
accelerometer require replacement, itís located
beneath the rear seat, and the yaw rate sensor is inside
the trunk, attached to the bottom of the package shelf.
The steering wheel position sensor is more difficult to
replace. Parts prices range from moderate to scary. Letís
hope for an easy-to-fix faulty connection with no parts
may be worth a shot to ring up Buick Customer Relations
at 800-521-7300 and ask for repair assistance once the
fault has been identified. With the low miles accrued on
this vehicle safety system, itís possible they might
participate in some way.