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Circuit/System Testing

  1. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC control module.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 17 and ground.
    • If the test lamp is ON 
    1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
    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 K9 body control module.
    • If the test lamp is OFF 
  3. Connect a test lamp between the control circuit terminal 17 and ground.
  4. Engine running, connect a 3 A fused jumper wire between the signal circuit terminal 15 and ground.
  5. Verify the test lamp is ON
    • If the test light is not ON 
    1. Ignition OFF, disconnect the harness connector at the K9 body 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 K9 body control module.
    • If the test lamp is ON 
  6. Replace the K33 HVAC control module.
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