Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 683 (KEYLESS ENTRY SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDOOR UNLOCK FUNCTION INOPERATIVE WITH TRANSMITTER
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Door Unlock Function Inoperative With Transmitter
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Door Unlock Function Inoperative With Transmitter
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Door Unlock Function Inoperative with Transmitter
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: Use this diagnostic chart when the door unlock function is inoperative when using the keyless entry transmitter. All other keyless entry functions operate normally. | |||
| 1 | Did you perform the Remote Keyless Entry System Check? | Go to Step 2 | Go to Diagnostic System Check - Remote Keyless Entry |
| 2 | Press the door unlock button on the transmitter. Do the door locks operate normally? |
Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS | Go to Step 3 |
| 3 | Operate the door locks from the controls inside the vehicle. Do the door locks operate normally? |
Go to Step 4 | Go to DIAGNOSTIC SYSTEM CHECK - DOOR SYSTEMS |
| 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.
|
Go to Step 5 | Go to Step 7 |
| 5 | Test the body control module (BCM) portion of the lock relay control circuit for an open or high resistance. Refer to CIRCUIT TESTING
and WIRING REPAIRS
. Did you find and correct the condition? |
Go to Step 9 | Go to Step 6 |
| 6 | Inspect for poor connections at the harness connector of the BCM. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
and CONNECTOR REPAIRS
. Did you find and correct the condition? |
Go to Step 9 | Go to Step 8 |
| 7 | Replace the transmitter. Refer to Transmitter Programming . Did you complete the replacement? |
Go to Step 9 | - |
| 8 |
IMPORTANT:
Perform the BCM programming procedure when replacing the BCM. Replace the BCM. Refer to BODY CONTROL MODULE REPLACEMENT
.Did you complete the replacement? |
Go to Step 9 | - |
| 9 | 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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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.