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.

Ignition Off and all vehicle systems OFF.

NOTE:

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

Verify the battery voltage is within 12.4 V to 12.8 V at the C1 Battery.
- If not within the specified range
  Refer to Battery Inspection/Test
- Go to next step: If within the specified range
Engine Running with all accessories off, allow the system voltage to stabilize.
Headlamps On.
Test for 13 V to 15 V at the C1 Battery.
- If not within the specified range
  Refer to Charging System Test
- Go to next step: If within the specified range
Verify no data communication DTCs are set.
- If data communication DTCs are set
  Diagnose these DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no data communication DTCs are set
Verify any of the DTC's P0615, P0616, or P0617 are not set
- If any of the DTC's are set
  Refer to: DTC P0615, P0616, or P0617
- Go to next step: If any of the DTC's are not set
Verify DTC P3051, P3053, or P3055 is not set as current.
- If none of the DTCs are not set Current
1. Clear all DTCs.
2. Road test the vehicle and perform a minimum of 2 Autostart/Autostop events.
3. Verify any of the DTC's P3051, P3053, or P3055 have not reset.
  - If any of the DTC have reset
    Proceed to Step 9.
  - Go to next step: If any of the DTC's P3051, P3053, or P3055 have not reset
4. The condition may be an intermittent fault and is currently not present.
Ignition On vehicle in service mode.
Perform the scan tool control function: Command the Starter Pinion Solenoid On.
Verify the engine is not cranking.
- If the engine is cranking
  Refer to: Circuit/System Testing - Starter System Test
- Go to next step: If the engine is not cranking
Refer to: Circuit/System Testing - T19 Multifunction Power Supply Converter Input/Output Circuit Test