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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System And Washer System >> Diagnostic Information and Procedures >> DTC B3715 or B3875: Windshield Wiper Relay Circuit >> Component Testing >> Relay Test

Relay Test

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

      Replace the relay.

    • If between 60-200 Ω 
  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 5 Ω between terminals 30 and 87A.
    • If 5 Ω or greater 

      Replace the relay.

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

      Replace the relay.

    • If less than 5 Ω 
  7. All OK
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