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Home >> Buick >> 2019 >> Encore Base >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> Stop/Start System Malfunction (LE2) >> Circuit/System Testing

Circuit/System Testing

Test 1

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:S112 Fuel Economy Mode Switch
  3. Test for less than 10 ohms between the test points:Ground circuit terminal 3 & Ground
    • If 10 ohms or greater 
    1. Disconnect the ground connection: @ The other end of the circuit
    2. Test for less than 2 ohms between the test points:Ground circuit terminal 3 @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On/Vehicle - In Service Mode
  5. Verify the scan tool parameter:Stop/Start Select Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:K9 Body Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 5 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:K9 Body Control Module
    • Go to next step: If the specified state 
  6. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 5 & Ground circuit terminal 3
  7. Verify the scan tool parameter:Stop/Start Select Switch = Active
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:K9 Body Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 5 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points:Signal circuit terminal 5 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K9 Body Control Module
    • Go to next step: If the specified state 
  8. Test or replace the component:S112 Fuel Economy Mode Switch

Test 2

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  2. Ignition/Vehicle - Off
  3. Disconnect the electrical connector:S112 Fuel Economy Mode Switch
  4. Connect a test lamp between the test points:S112 Fuel Economy Mode Switch - Control circuit terminal 1 & Control circuit terminal 2
  5. Ignition - On/Vehicle - In Service Mode
  6. Perform the appropriate scan tool control function:Stop/Start Select Switch Indicator Command - Cycle On and Off

    or

    Momentarily connect a 3 A fused jumper wire between the test points:Terminal 5 & Ground

  7. Verify the test lamp turns On and Off.
    • If the test lamp does not turn On and Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:X1 & X2 @ K9 Body Control Module
    3. Test for infinite resistance between the test points:S112 Fuel Economy Mode Switch - Control circuit terminal 1 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If less than infinite resistance
    4. Test for less than 2 ohms between the test points:S112 Fuel Economy Mode Switch - Control circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 ohms
    5. Ignition - On/Vehicle - In Service Mode
    6. Test for less than 1 V between the test points:

      S112 Fuel Economy Mode Switch - Control circuit terminal 2 @ Component harness & Ground

      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    7. Test for less than 2 ohms between the test points:S112 Fuel Economy Mode Switch - Control circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K9 Body Control Module
    • Go to next step: If the test lamp turns On and Off 
  8. Replace the component:S112 Fuel Economy Mode Switch

Test 3

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:T19 Power Supply Transformer
  3. Test for less than 10 ohms between the test points:
    • Ground circuit terminal 7 & Ground
    • Ground circuit terminal 12 & Ground
    • If 10 ohms or greater 
  4. Ignition/Vehicle & All vehicle systems - Off
    1. Disconnect the ground connection: @ The other end of the circuit
    2. Test for less than 2 ohms between the test points:
      • Ground circuit terminal 7 & The other end of the circuit
      • Ground circuit terminal 12 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  5. Ignition - On/Vehicle - In Service Mode
  6. Verify a test lamp turns On between the test points:
    • B+ circuit terminal 8 @ T19 Power Supply Transformer & Ground
    • B+ circuit terminal 11 @ T19 Power Supply Transformer & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points:Each B+ circuit terminal & Output terminal @ Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for infinite resistance between the test points:Each B+ circuit terminal & Output terminal @ Fuse
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:T19 Power Supply Transformer
      • Go to next step: If the test lamp turns On 
  7. Verify a test lamp turns On between the test points:Ignition circuit terminal 6 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points:Ignition circuit terminal 6 & Output terminal @ Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse..
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for infinite resistance between the test points:Ignition circuit terminal 6 & Output terminal @ Fuse
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:T19 Power Supply Transformer
    • Go to next step: If the test lamp turns On 
  8. Connect a test lamp between the test points:Terminal 5 @ T19 Power Supply Transformer & Ground
  9. Ignition Mode = Engine Starting
  10. Verify the test lamp turns On.
    • If the test lamp does not turn On 
  11. Ignition Off - Remove - Test Lamp
  12. Disconnect the electrical connector:X1 @ K20 Engine Control Module
    1. Test for infinite resistance between the test points:Terminal 5 @ T19 Power Supply Transformer & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
  13. Test for less than 2 ohms between the test points:Terminal 5 @ T19 Power Supply Transformer & The other end of the circuit @ K20 Engine Control Module
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • If less than 2 ohms - Replace the component:K20 Engine Control Module
    • Go to next step: If the test lamp turns On 
  14. Replace the component:T19 Power Supply Transformer
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