Models
• 2004 Cadillac DeVille
• 2004 Pontiac Bonneville, Bonneville GXP
Condition
Some customers may comment that after releasing the parking brake, the brake light on the instrument panel (IP) stays on.
Cause
This condition may be caused by a weak return spring located at the rear of the parking brake cables.
Correction
Replace the rear parking brake cables with new cables that have a more robust return spring.
Courtesy of ALLDATA
Passive types of wheel speed sensors are still used in many applications so understanding their operation is important.
As the metal tooth passed by the permanent magnet wrapped in copper wire, the magnetic field was altered and measured by a computer. This is not a sci-fi novel, but how a passive wheel speed sensor works.
A passive wheel speed sensor is often called a “variable reluctance sensor” by some engineers. The sensor is mounted at a specific gap from a toothed reluctor ring. As the teeth pass by the wheel speed sensor, it changes the magnetic field and produces alternating current or AC voltage. The AC voltage can be seen by a scope as a sine wave.
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All wheel speed sensor codes are just the starting points of a diagnosis and not a reason to order a part.
