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HOMESERVICE MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 49 (WIPER SYSTEM AND WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESWINDSHIELD WIPER SYSTEM MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol

Circuit/System Verification

2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2018 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Windshield Wiper High Speed Switch parameter changes between Active and Inactive when activating the high speed windshield wipers.
    • If the parameter does not change 

      Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction.

    • Go to next step: If the parameter changes 
  3. Verify the scan tool Windshield Wiper Switch parameter changes between Off and Low when activating the low speed windshield wipers.
    • If the parameter does not change 

      Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction.

    • Go to next step: If the parameter changes 
  4. Verify the scan tool Windshield Wiper Switch parameter changes between Delay 1 and Delay 5 when cycling the intermittent speed windshield wipers.
    • If the parameter does not change 

      Test or replace the S82 Windsheild Wiper/Washer Switch.

    • Go to next step: If the parameter changes 
  5. Verify the M75 Windshield Wiper Motor changes between Off, Low, and High when cycling the S82 Windshield Wiper/Washer Switch between Off, Low, and High.
    • If the Windshield Wiper Motor does not cycle between Off, Low, and High 

      Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction

    • Go to next step: If the Windshield Wiper Motor cycles between Off, Low, and High 
  6. Ignition OFF.
  7. Verify the scan tool Windshield Wiper Park Switch parameter is Active.
    • If the parameter does not change 

      Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction.

    • Go to next step: If the parameter changes 
  8. All OK.
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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.