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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 958 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCRUISE CONTROL INDICATOR INOPERATIVE (WITHOUT THROTTLE ACTUATOR CONTROL)
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Cruise Control Indicator Inoperative (Without Throttle Actuator Control)

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Cruise Control Indicator Inoperative (Without Throttle Actuator Control)
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Cruise Control Indicator Inoperative (Without Throttle Actuator Control)

Step Action Values Yes No
Schematic Reference: Cruise Control Schematics 
Connector End View Reference: Cruise Control Connector End Views 
1 Did you perform the Cruise Control Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Cruise Control 
2
  1. Turn the ignition OFF.
  2. Install a scan tool.
  3. Turn the ignition ON, with the engine OFF.
  4. With the scan tool, Command the Cruise Control Lamp Test parameter ON, in the instrument panel cluster (IPC) Special Functions.
Does the Cruise indicator illuminate in the IPC?		 - Go to Step 3  Go to Step 8 
3
  1. Turn the ignition OFF.
  2. Disconnect the cruise control module.
  3. Turn the ignition ON, with the engine OFF.
  4. With a DMM, measure the voltage of the cruise control engaged signal circuit.
Does the voltage measure at approximately the specified voltage?		 B+ Go to Step 4  Go to Step 5 
4 Test the cruise control engaged signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
5 Test the cruise control engaged signal circuit for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
6 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and toConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
7 Replace the cruise control module. Refer to Cruise Control Module Replacement (4.3L Engine) .
Did you complete the replacement?		 - Go to Step 10  -
8 Replace the instrument panel cluster (IPC). Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console.
Did you complete the replacement?		 - Go to Step 10  -
9
IMPORTANT: Program the replacement PCM.
Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls-4.3L.Did you complete the replacement?		 - Go to Step 10  -
10 Operate the system in order to verify the repair.
Does the system operate properly?		 - System OK Go to Step 2 
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.