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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1300 (CRUISE CONTROL SYSTEM)DESCRIPTION AND OPERATIONCRUISE CONTROL DESCRIPTION AND OPERATIONSYSTEM DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

System Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION System Description
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Do not use the cruise control on slippery roads, steeply graded roads, or in heavy traffic of heavy or varying volume. Failure to follow these CAUTIONS could possibly cause you to loose control of the vehicle and result in damage to the vehicle and personal injury.

Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions. However, steep grades up or down may cause variations in the selected speeds. The cruise control system has the capability to perform the following actions:

  • SET CRUISE SPEED
  • CRUISE
  • COAST
  • RESUME SPEED
  • ACCELERATE
  • TAP UP
  • TAP DOWN

The cruise control circuit contains the following components:

  • A Cruise Control Servo
  • A Cruise Control Module
  • A Cruise Control Switch
  • The Vehicle Speed Sensor (VSS)

The cruise control module and the servo are the two main components that allow the system to control and maintain the desired vehicle speed. The cruise control module monitors vehicle speed and provides the cruise control servo with the necessary commands to maintain or change vehicle speed in response to inputs from the cruise control switch. In response to the control module, the servo moves a connecting arm. The connecting arm is attached to the cruise control cable. The cable moves the throttle linkage in order to vary the throttle position. This action maintains the desired cruise speed. The cruise control module contains a low speed limit that will prevent system engagement below a minimum speed of approximately 40.23 km/h (25 mph). The module is controlled by the cruise control switch. The cruise control is in "Standby Disabled" until all of the conditions that are inconsistent with the cruise control operation are cleared.

Cruise control operation is disengaged when the cruise control module receives a cancel signal from the following components:

  • The Stop Lamp Switch
  • The Cruise Control Switch
  • The Park/Neutral Position (PNP) Switch on vehicles equipped with an auto transaxle
  • The Cruise Control Release Switch on vehicles equipped with an manual transaxle

Upon receiving a cancel signal, the cruise control de-energizes the magnetic clutch inside the cruise control servo. With the magnetic clutch de-energized, the servo and the connecting arm are no longer mechanically connected and the throttle returns to the idle position.

RENDER: 1.0x

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