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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 >> Proactive Alert Identifier SAC002 >> Circuit/System Testing

Circuit/System 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. Test for the following values at each test location:
    • Test for less than 900 mV between terminal A X2 at the X50D Fuse Block - Battery and terminal A X4 at the X50A Fuse Block - Underhood while cranking the engine.
    • Test for less than 500 mV between terminal A X4 at the X50A Fuse Block - Underhood and terminal A X2 at the M64 Starter Motor while cranking the engine.
    • Test for less than 500 mV drop between negative battery cable and the M64 Starter Motor Case with the ignition in CRANK/START.
    • If 900 mV between terminal A X2 at the X50D Fuse Block - Battery and terminal A X4 at the X50A Fuse Block - Underhood 

      Replace the Positive Battery Cable between the X50D Fuse Block - Battery and X50A Fuse Block - Underhood, and continue testing voltage drop at all other cables.

    • If 500 mV or greater between terminal A X4 at the X50A Fuse Block - Underhood and terminal A X2 at the M64 Starter Motor 

      Replace the Auxiliary Generator Battery Jumper Cable between the X50A Fuse Block - Underhood and M64 Starter Motor, and continue testing voltage drop at all other cables.

    • If 500 mV or greater between negative battery cable and the M64 Starter Motor Case 

      Replace the Battery Negative Cable, and continue testing voltage drop at all other cables.

  2. Clear the Proactive Alert Using the Scan Tool "Vehicle Diagnostics" - "Vehicle Proactive Alerts".
    • Go to next step: If all tests are less than the specific value 
    3. NOTE:

    If Battery replacement is performed under Warranty, a Warranty Code from the EL-50313 Midtronics GR8 or EL-52800 Exteq DCBS Battery Tester/Charger IS required.

  3. Refer to Battery Inspection/Test 
    • If Battery Fails the Test 

      Replace the C1 battery.

  4. Clear the Proactive Alert Using the Scan Tool "Vehicle Diagnostics" - "Vehicle Proactive Alerts".
    • Go to next step: If the Battery Passes the Test 
  5. The condition is currently not present and may be an intermittent fault.
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