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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the B10B ambient light/sunload sensor. Verify there are no electrical components connected to the vehicle to include the MDI or battery charger as applicable. It may take up to 10 minutes for all vehicle systems to power down.
  2. Test for less than 5 Ω between the low reference circuit terminal 6 and ground.
    • If 5 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC 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 K33 HVAC control module.
    • If less than 5 Ω 
  3. Ignition ON.
  4. Verify the scan tool parameter Passenger Compartment Air Temperature (Unfiltered) is less than -35°F.
    • If -35°F or greater 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC control module.
    2. Test for infinite resistance between the signal circuit terminal 3 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K33 HVAC control module.
    • If less than -35°F 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 6.
  6. Verify the scan tool parameter Passenger Compartment Air Temperature (Unfiltered) is greater than 240°F.
    • If 240°F or less 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC control module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF
    4. 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 K33 HVAC control module.
    • If greater than 240°F 
  7. Test or replace the B10B ambient light sensor.
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