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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LS >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Suspension System - Suspension Damping >> Diagnostic Information And Procedures >> DTC C0575, C0580, C0585, Or C0590: Shock Absorber Actuator Circuit(s) >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the appropriate Q37 Shock Absorber Actuator, Ignition ON/Vehicle in Service Mode.
  2. Test for 9.5 - 11 V between the control circuit terminal 1 and ground.
    • If less than 9.5 V 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K19 Suspension 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. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K19 Suspension Control Module, Ignition ON/Vehicle in Service Mode.
    4. 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 K19 Suspension Control Module.
    • If greater than 11 V 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K19 Suspension Control Module, Ignition ON/Vehicle in Service Mode.
    2. Test for less than 1 V between the control 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 9.5 - 11 V 
  3. Test for greater than 9.5 V between the control circuit terminal 1 and the low control circuit terminal 2.
    • If less than 9.5 V 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K19 Suspension Control Module.
    2. Test for less than 1 V between the low control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the low 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 K19 Suspension Control Module.
    • Go to next step: If greater than 9.5 V 
  4. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K19 Suspension Control Module, Ignition ON/Vehicle in Service Mode.
  5. Test for infinite resistance between the low control circuit and ground.
    • If less than infinite resistance 
    1. Repair the short to ground on the circuit.
    • Go to next step: If infinite resistance 
  6. Replace the Q37 Shock Absorber Actuator.
  7. Verify the DTC does not set while operating the vehicle under Conditions for Running the DTC.
    • If the DTC sets 

      Replace the K19 Suspension Control Module.

    • Go to next step: If the DTC does not set 
  8. All OK.
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