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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System And Washer System >> Diagnostic Information and Procedures >> DTC B3715 or B3875: Windshield Wiper Relay >> Component Testing

Component Testing

Relay Test

  1. Ignition OFF, disconnect the appropriate relay.
  2. Test for 60-200Ω between terminals 85 and 86.
    • If less than 60 or greater than 200Ω 

      Replace the relay.

    • If between 60-200Ω 
  3. Test for infinite resistance between the terminals listed below:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If less than infinite resistance 

      Replace the relay.

    • If infinite resistance 
  4. Test for less than 5Ω between terminals 30 and 87A.
    • If 5Ω or greater 

      Replace the relay.

    • If less than 5Ω 
  5. Install a 10A fused jumper wire between relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground.
  6. Test for less than 5Ω between terminals 30 and 87.
    • If 5Ω or greater 

      Replace the relay.

    • If less than 5Ω 
  7. All OK