Question about 1998 Buick Century

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1. vehicle vibrates while braking @ speed of 55mph+ 2. automatic window does not operate correctly

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The reason your car vibrates when you hit the brakes is most likely the front rotors have been heated up and that has caused them to warp. So when you push on the brakes it shimmies or causes vibration. You are most likely going to have to replace your rotors or have them mic'ed buy a mecanic you will let you know if their is enough rotor their to be mic'ed or to replace it. Not all shops can turn the rotors so I would call to find out. The window problem could be a few different things and they are, the window track is going bad, just a worn out track, bearings in the wheel are frozen up, motor is going out, switch is going bad as well.

Posted on Oct 05, 2010

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Hello: 1. You may have rotors that are not parallel, if you can fell the brake pedal trying to move up and down while you have the vibration then you need to get the rotors turned and also check the front pads while its apart. If the brake pedal is not moving when you have the vibration or the steering wheel is not shaking then it could be the back rotors (if you have 4 wheel disc brakes). If its the driver window that does not go down automatically you may have a bad switch.

Posted on Oct 04, 2010

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Vibration in steering wheel in park and slow speed and seems to go away at 55mph.

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My 2005 Ford Explorer 4x4 vibrates/shakes

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Sport trac cruise control works off and on

First thing , knowing what all is involved in the cruise control system helps
Speed Control The speed control system is designed to maintain vehicle speed between 48 and 200 km/h (30 and 125 mph).
Normally, when the brake pedal is applied, the speed control module deactivates the speed control system. Under increased brake pedal effort, the deactivator switch, a normally closed switch, will open and remove power to the speed control actuator clutch, releasing the throttle independently of the speed control module.

Principles of Operation
The brake pedal position (BPP) switch is normally closed to ground. When the brake pedal is applied with the speed control system engaged, the BPP switch closes (to battery voltage), putting the speed control in stand-by mode.
NOTE: A redundant brake deactivator (BPA) switch is provided as an additional safety feature.
NOTE: The speed control module is integral to the powertrain control module (PCM).
The clockspring provides the electrical interface between the steering column wiring and the speed control switches in the steering wheel.
The inputs to the powertrain control module (PCM) required to operate the speed control system are the:
  • anti-lock brake (ABS) module
  • digital transmission range (TR) sensor
  • speed control deactivator switch
  • speed control switches
  • vehicle speed signal (VSS)
The inputs to the speed control actuator come from the powertrain control module (PCM).
The outputs of the speed control actuator go to the speed control cable controlled throttle position sensor.

Special Tool(s) 73III Automotive Meter
105-R0057 or equivalent Worldwide Diagnostic System (WDS)

New Generation STAR (NGS) Tester
418-F052, or equivalent diagnostic tool with appropriate adapter cable
Inspection and Verification
  1. Verify the customer concern.
  1. Verify the speedometer operates correctly without using the speed control by test driving the vehicle. If the speedometer does not operate correctly, refer to Section 413-00 .
  1. Verify the stoplamps operate correctly with the ignition switch in the OFF position. If the stoplamps do not operate correctly, refer to Section 417-01 .
  1. Verify the parking brake is not applied and is operating correctly. If the parking brake is not operating correctly, refer to Section 206-00 .
  1. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart Mechanical Electrical
  • Speed control cable
  • Throttle lever
  • Speed control actuator
  • Battery junction box (BJB) fuse 40 (15A)
  • Circuitry
  • Powertrain control module (PCM)

  1. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • SCP or ISO circuit fault; all electronic control units no response/not equipped, refer to Section 418-00 .
    • No response/not equipped for PCM, Go To Pinpoint Test A .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the KOEO Test.
  1. If the DTCs retrieved are related to the concern, go to the Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) Index to continue diagnostics.
  1. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.
NOTE: DTC P0703 and DTC P1572 must be repaired before any other DTC.

Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) Index DTCs Description Source Action P0500 Vehicle Speed Error PCM REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual. P1565 Speed Control Command Switches High/Out of Range PCM Go To Pinpoint Test A . P1566 Speed Control Command Switches Low/Out of Range PCM Go To Pinpoint Test B . P1567 Speed Control Output Circuit PCM Go To Pinpoint Test C . P1568 Speed Control Unable to Hold Speed PCM Go To Pinpoint Test D . P1572 Brake On/Off Failure PCM Go To Pinpoint Test E . P0703 Brake Switch Input Malfunction PCM Go To Pinpoint Test E . IF thier are no codes go to the Symptom Chart

Symptom Chart Condition Possible Sources Action
  • No communication with the powertrain control module (PCM)
  • Battery junction box (BJB) fuse(s):
    • 11 (40A)
    • 40 (15A).
  • Circuitry.
  • PCM.
  • REFER to Section 418-00 to continue communication diagnostics.
  • The speed control switch is inoperative - no DTCs
  • Speed control switch.
  • INSTALL a new speed control switch. REFER to Speed Control Switch - With Remote Audio/Climate Controls or Speed Control Switch - Without Remote Audio/Climate Controls in this section.
  • The speed control is inoperative - no DTCs
  • Low battery voltage.
  • Circuitry.
  • Digital transmission range (TR) sensor (automatic transmission only).
  • Parking brake switch.
  • Go To Pinpoint Test F .
  • The speed control indicator lamp is always on
  • Circuitry.
  • Instrument cluster.
  • Powertrain control module (PCM).
  • Go To Pinpoint Test G .

Jul 07, 2017 | 2003 Ford Explorer Sport Trac

1 Answer

Vibration at speeds of 45-55mph

Check your drive shaft u-joints..Number one cause.Have a great night!!!

Apr 03, 2009 | 1995 Dodge Dakota

2 Answers

I own a 2005 dodge ram viper pickup truck srt 10 which i bought 2 years ago. The problem is vehicle vibrates when braking at any speed over 20mph and the steering wheel shimmies from side to side ...

This One is One Of Two Things

1. Change The Rear Brakes!!!!!! Thats Right When Your Rear Brakes Are Worn You Go Through
Front Brakes Like Crazy As They Are The Only Way Your Car Can Really Stop.

2. Check The Brake Master Cylinder If Its Off It Will Make Your Front Brakes Do All The Work.

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1 Answer

Brake vibration

yes it can be more than brakes

this could be your drive line needs replacement this is what im suggesting take into nearest just brakes and have an inspection done for free

Jun 04, 2008 | 1995 Pontiac Firebird

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