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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 >> Stop/Start System Malfunction >> 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. Ignition ON.
    2. NOTE:

    A low or high voltage DTC may set in multiple control modules due to a concern with the battery or charging system.

  2. Verify there are no system voltage DTCs set as current or history in any control module.
    • Go to next step: If no system voltage DTCs are set 
  3. Ignition Off and all vehicle systems OFF.
    4. NOTE:

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

  4. Verify the battery voltage is within 12.4 V to 12.8 V at the C1 Battery.
    • Go to next step: If within the specified range 
  5. Engine Running with all accessories off, allow the system voltage to stabilize.
  6. Test for 13 V to 15 V at the C1 Battery.
  7. Verify the disable switch Indicator turns on and off when pressing and releasing the stop/start select switch.
    • If the Indicator does not turn on and off 

      Refer to Circuit/System - Stop/Start Switch Malfunction

    • Go to next step: If the Indicator turns on and off 
  8. Verify the scan tool parameters Battery Sensor Module state of Charge Error is less than 10%.
    • If not the specified state 
    1. Perform the Battery Sensor Module learn. Refer to Battery Sensor Module Learn
    2. After performing the Battery Sensor learn road test the vehicle and verify the Stop/Start system operates.
      • Go to next step: If no condition exists
    3. A fault is not currently present and may be an intermittent condition.
    • Go to next step: If the specified state 
  9. Road test the vehicle and verify the Stop/Start system operates.
    • Go to next step: If no condition exists 
  10. Operate the vehicle allowing a vehicle Auto Stop/Start event to occur.
  11. Verify the infotainment system, HVAC system, instrument cluster, shift lever, park brake switch, and the left and right steering wheel controls continue to operate without interruption.
    • If a condition exists 

      Refer to Circuit/System - Stop/Start System Malfunction

    • Go to next step: If no condition exists 
  12. A fault is not currently present and may be an intermittent condition.
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