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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 135 (12 V Starting And Charging - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC U3018, U3019, or U3501-U350A >> Circuit/System Verification

Circuit/System Verification

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. Vehicle Off all systems off.
  2. NOTE:

    The battery voltage should stabilize after a few minutes of turning the vehicle Off.

  3. Test for 12.4 to 12.8 V between the test points: Battery Positive Post & Battery Negative Post
    • Go to next step: If between 12.4 and 12.8 V 
  4. Propulsion Active - For greater than 15 s
  5. Accessories - Off
  6. Test for 13.4 to 15 V between the test points: Battery Positive Post & Battery Negative Post
    • Go to next step: If between 13.4 and 15 V 
  7. Verify the scan tool parameter: Battery Voltage @ Appropriate control module.= Within 1 V of the battery voltage
    • If not within 1 V of each other 

      Refer to: Circuit/System Testing

    • Go to next step: If within 1 V of each other 
  8. Verify the scan tool parameter: Ignition Voltage @ Control Module = Within 1 V of the battery voltage
    • If not within 1 V of each other 

      Refer to: Circuit/System Testing

    • Go to next step: If within 1 V of each other 
  9. All OK.