Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Testing A

Ignition OFF, disconnect the harness connector at the appropriate Q37 Shock Absorber Actuator.
Connect a test lamp between the control circuits terminal 1 and terminal 2, ignition ON.
Verify the test lamp illuminates.
- If the test lamp does not illuminate
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K19 Suspension Control Module.
2. Test for infinite resistance between the control circuits listed below and ground.
  - Terminal 1
  - Terminal 2
  - 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 circuits listed below end to end.
  - Terminal 1
  - Terminal 2
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω
4. Test for less than 1V between the control circuits listed below and ground.
  - Terminal 1
  - Terminal 2
  - If 1V or greater, repair the short to voltage in the circuit.
  - If less than 1V, replace the K19 Suspension Control Module
- If the test illuminates
Test or replace the appropriate Q37 Shock Absorber Actuator.

Testing B

Ignition OFF, disconnect the harness connector at each of the Q37 Shock Absorber Actuators.
Disconnect the harness connector at the K19 Suspension Control Module.
Test for infinite resistance between the each control circuit listed below and ground.
- Terminal 2
- Terminal 3
- Terminal 4
- Terminal 5
- Terminal 13
- Terminal 14
- Terminal 15
- Terminal 16
- If less than infinite resistance
  Repair the short to ground on the circuit.
- If infinite resistance
Test for 2-4 Ω between each Q37 Shock Absorber Actuator terminals 1 and 2.
- If not within the specified range
  Replace the appropriate Q37 Shock Absorber Actuator.
- If within the specified range
  Replace the K19 Suspension Control Module.