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.
Test Description
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Description
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 2: Verifies that DTC B2945 is a current DTC.
- 3: Tests for a short to ground in the Passlock™ sensor or the pigtail harness.
DTC B2945
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you perform the Theft Deterrent Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Theft Deterrent |
| 2 |
|
Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 3 |
|
Go to Step 4 | Go to Step 6 |
| 4 |
IMPORTANT:
The use of a DMM J 39200 is crucial in this step because voltage may be measured for 10 milliseconds.
|
Go to Step 9 | Go to Step 5 |
| 5 | Test the Passlock battery voltage circuit for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 13 | Go to Step 6 |
| 6 | Test the Passlock™ battery voltage circuit for a short to ground or open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 13 | Go to Step 7 |
| 7 | Test the Passlock™ ground circuit for a open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 13 | Go to Step 8 |
| 8 | Inspect for poor connections at the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 13 | Go to Step 10 |
| 9 | Inspect for poor connections at the Passlock ™ sensor. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 13 | Go to Step 11 |
| 10 |
IMPORTANT:
When replacing the BCM refer to Body Control Module (BCM) Programming/RPO Configuration
in Body Control System. Replace the BCM. Refer to Body Control Module Replacement
in Body Control System.Did you complete the replacement? |
Go to Step 13 | - |
| 11 | Replace the Passlock™ Sensor. Refer to Ignition Lock Cylinder Case Replacement
in Steering Wheel and Column. Did you complete the replacement? |
Go to Step 12 | - |
| 12 | Perform the Passlock™ learn procedure. Refer to Programming Theft Deterrent System Components . Did you complete the procedure? |
Go to Step 13 | - |
| 13 |
|
Go to Step 3 | System OK |
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.