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Home >> Buick >> 2020 >> Enclave Essence, AWD >> Repair and Diagnosis >> Suspension >> Suspension Control Systems >> Suspension Controls System >> Diagnostic Information and Procedures >> DTC C0615, C0620, or C0625 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF. Disconnect the harness connector at the appropriate Vertical Acceleration Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K19 Suspension Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K19 Suspension Control Module.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the K19 Suspension Control Module.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K19 Suspension Control Module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the K19 Suspension Control Module, ignition ON.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K19 Suspension Control Module.
    • Go to next step: If between 4.8 - 5.2 V 
  5. Verify the appropriate scan tool Suspension Position Sensor parameter is less than 1 V.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the harness connector at the K19 Suspension Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 3 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K19 Suspension Control Module.
    • Go to next step: If less than 1 V 
  6. Install a 3 A fused jumper wire between the 5-volt reference circuit terminal 1 and the signal circuit terminal 3, engine RUNNING.
  7. Verify the appropriate scan tool Suspension Position Sensor parameter is greater than 4.8 V.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the K19 Suspension Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K19 Suspension Control Module.
    • Go to next step: If 4.8 V or greater 
  8. Test or replace the appropriate Vertical Acceleration Sensor.
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