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Home >> Buick >> 2016 >> Encore Base, FWD >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> Stop/Start System Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Test for greater than 12 V between the battery positive terminal and negative terminal.
    • If greater than 12 V 
  3. Verify no DTCs are set.
    • If no DTCs are set 
  4. Press the air conditioning switch located on the climate control system and make sure it turns ON and OFF.
  5. Verify that when air conditioning switch is pressed it toggles from Green to Amber.
    • If the switch indicator toggles to Green and Amber 
  6. Verify Battery Sensor Module Battery State Information parameter reads Available.
    • If parameter reads Available
    7. NOTE:

    A vehicle hoist can be used to verify the autostop and autostart operation.

  7. Verify the autostop and autostart functions are functioning properly while operating the vehicle under the conditions for entering a start/stop event. Refer to Stop/Start System Description and Operation 
    • If the vehicle does not autostop or autostart 
    1. Observe the scan tool Autostop Disable Reason, Autostop Inhibit Reason, Autostart Inhibit, and Autostart Reason parameters while operating the vehicle under the conditions for entering a start/stop event. Refer to Stop/Start Disable, Inhibit, and Restart Reasons . These parameters will identify the specific cause for the autostop or autostart disable.
    • If the vehicle autostops and autostarts 
  8. Verify the infotainment system remains active during a start/stop event.
    • If the infotainment system turns off or restarts during a start/stop event. 

      Refer to Circuit/System Testing - Power Supply Transformer Circuit Malfunction

    • If the infotainment system remains active during a start/stop event 
  9. All OK.

Power Supply Transformer Circuit Malfunction (Automatic Transmission)

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the T19 Power Supply Transformer. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between each ground circuit terminal and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between each B+ circuit terminal and ground.
    • If the test amp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the T19 Power Supply Transformer.
    • If the test lamp illuminates 
  5. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the T19 Power Supply Transformer.
    • If the test lamp illuminates 
  6. Install a test lamp between the control circuit terminal 5 and ground.
  7. Verify the test lamp illuminates while cranking the engine.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If the test lamp illuminates 
  8. Test or replace the T19 Power Supply Transformer.
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