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Home >> GMC >> 2021 >> Terrain SLE, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> DTC B370A >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2020 GMC Terrain and 2020 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify DTC U151A is not set.
    • Go to next step: If the DTC is not set 
  3. Place the S82 Windshield Wiper/Washer Switch in the intermittent delay setting and spray the outside of the windshield in the area of the B177 Rain/Ambient Light Sensor Module with a water bottle. It may be necessary to increase the sensitivity of the intermittent delay to achieve windshield wiper operation.
  4. Verify the windshield wipers operate at low speed.
    • If the wipers are not operating at low speed 

      Refer to Circuit/System Testing.

    • Go to next step: If the wipers are operating at low speed 
  5. All OK.
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