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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1659 (KEYLESS ENTRY SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESKEYLESS ENTRY SYSTEM INOPERATIVE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Keyless Entry System Inoperative

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Keyless Entry System Inoperative
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Keyless Entry System Inoperative

Step Action Yes No
1 Did you perform the Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Remote Keyless Entry 
2 Press each button of the transmitter one at a time.
Does the system operate normally?		 Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR in Wiring Systems Go to Step 3 
3 Lock and unlock the door locks using the controls inside the vehicle.
Do the locks operate properly?		 Go to Step 4  Go to DIAGNOSTIC SYSTEM CHECK - DOOR SYSTEMS in Doors
4
IMPORTANT: Inspect that the keyless entry transmitter is the correct model for the vehicle remote system. A wrong model transmitter may pass this test but will not activate the vehicle remote system.
  1. Turn on the J 43241  Keyless Entry Tester. See Special Tools and Equipment .
  2. Place the transmitter on the J 43241  test pad. See Special Tools and Equipment .
  3. Press each button of the transmitter one at a time.
Does a tone sound and the green light illuminate on the J 43241  after each button is pressed?. See Special Tools and Equipment .		 Go to Step 9  Go to Step 5 
5 Do any of the buttons on the transmitter sound the tone and illuminate the green light when pressed? Go to Step 8  Go to Step 6 
6 Replace the transmitter battery. Refer to Transmitter Battery Replacement .
Did you complete the replacement?		 Go to Step 7  -
7
  1. Turn on the J 43241  Keyless Entry Tester. See Special Tools and Equipment .
  2. Place the transmitter on the J 43241  test pad. See Special Tools and Equipment .
  3. Press each button of the transmitter one at a time.
Does a tone sound and the green light illuminate on the J 43241  after each button is pressed? See Special Tools and Equipment .		 Go to Step 9  Go to Step 8 
8 Replace the transmitter.
Did you complete the replacement?		 Go to Step 9  -
9 Perform the transmitter programming procedure. Refer to Transmitter Programming 
Did the locks cycle to lock then unlock?		 Go to Step 11  Go to Step 10 
10
IMPORTANT: When replacing the Liftgate Module (LGM), perform the Liftgate Module programming procedure and then the transmitter programming procedure.
Replace the LGMRefer to LIFT GATE CONTROL MODULE REPLACEMENT in Body Rear End.Refer to Transmitter Programming  in Keyless Entry.Did you complete the replacement?		 Go to Step 11  -
11 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
RENDER: 1.0x

NO RELATED

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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.