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 1425 (WIPER SYSTEM & WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESMOISTURE SENSING FEATURE INOPERATIVE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Moisture Sensing Feature Inoperative
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Moisture Sensing Feature Inoperative
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.
Moisture Sensing Feature Inoperative Diagnostic Test
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Wiper/Washer System Schematics Connector End View Reference: Wiper/Washer System Connector End Views |
|||
| 1 | Did you perform the Wiper/Washer System Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Wiper/Washer |
| 2 | Verify the fault is present. Does the system operate normally? |
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | While the windshield wiper/washer system is in the automatic mode does the wiper motor operate at continuous delay intervals? | Go to Step 5 | Go to Step 4 |
| 4 |
|
Go to Step 5 | Go to Wipers Inoperative - One or More Modes |
| 5 |
|
Go to Step 6 | Go to Step 8 |
| 6 | Connect a test lamp from the accessory voltage supply circuit terminal to the ground circuit terminal in the moisture sensor harness connector. Does the test lamp illuminate? |
Go to Step 7 | Go to Step 9 |
| 7 | Test the moisture sensor signal 1 circuit for an open, short to ground, or short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 10 |
| 8 | Repair the accessory voltage supply circuit to the moisture sensor for an open or short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Is the repair complete? |
Go to Step 12 | - |
| 9 | Repair the moisture sensor ground circuit for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Is the repair complete? |
Go to Step 12 | - |
| 10 | Inspect for poor connections at the moisture 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 12 | Go to Step 11 |
| 11 | Replace the moisture sensor. Refer to Windshield Outside Moisture Sensor Replacement . Did you complete the replacement? |
Go to Step 12 | - |
| 12 | Operate the system in order to verify the repair. Did you correct the condition? |
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.