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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Vehicle Access System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B16C5 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: E7 Rear License Plate Lamp
  3. Test for infinite resistance between the test points: Signal terminal 2 & Ground terminal 1 - Switch - Not Pressed
    • If less than infinite resistance 

      Replace the component: E7 Rear License Plate Lamp

    • Go to next step: If infinite resistance 
  4. Test for less than 3 ohms between the test points: Signal terminal 2 & Ground terminal 1 - Switch - Pressed
    • If 3 ohms or greater 

      Replace the component: E7 Rear License Plate Lamp

    • Go to next step: If less than 3 ohms 
  5. All OK.
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