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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 12 (WIPER SYSTEM & WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESMOISTURE SENSING FEATURE INOPERATIVE
2009 Chevrolet Tahoe Base, 4.8 C
Moisture Sensing Feature Inoperative
2009 Chevrolet Tahoe Base, 4.8 CSECTION Moisture Sensing Feature Inoperative
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Moisture Sensing Feature Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Wiper/Washer Schematics Connector End View Reference: Wiper/Washer Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Verify that the moisture sensing inoperative fault is present. Does the system operate normally? |
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | While the windshield wiper/washer system is in the automatic mode does the wiper motor operate at normal delay intervals? | Go to Step 5 | Go to Step 4 |
| 4 |
|
Go to Step 5 | Go to Windshield Wiper Washer System Malfunction |
| 5 |
|
Go to Step 6 | Go to Step 10 |
| 6 | Connect a test lamp between the accessory voltage circuit of the moisture sensor connector and the ground circuit of the moisture sensor connector. Does the test lamp illuminate? |
Go to Step 7 | Go to Step 11 |
| 7 | Test the outside moisture sensor signal 1 circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? |
Go to Step 13 | Go to Step 8 |
| 8 | Test the outside moisture sensor signal 2 circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? |
Go to Step 13 | Go to Step 9 |
| 9 | Inspect for poor connections at the harness connector of the outside moisture sensor. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 13 | Go to Step 12 |
| 10 | Repair the short to ground or open in the accessory voltage circuit of the outside moisture sensor. Refer to Circuit Testing
and Wiring Repairs
. Is the repair complete? |
Go to Step 13 | - |
| 11 | Repair the high resistance or open in the ground circuit of the outside moisture sensor. Refer to Circuit Testing
and Wiring Repairs
. Is the repair complete? |
Go to Step 13 | - |
| 12 | Replace the outside moisture sensor Refer to Windshield Outside Moisture Sensor Replacement . Did you complete the replacement? |
Go to Step 13 | - |
| 13 | 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.