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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seat Heating System And Seat Cooling System >> Diagnostic Information and Procedures >> Vented Seat Malfunction >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    Circuit/System Verification must be performed before proceeding with Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate blower motor listed below. It may take up to 2 minutes for all vehicle systems to power down.
    • M73A seat blower motor - driver back
    • M73C seat blower motor - driver cushion
    • M73B seat blower motor - passenger back
    • M73D seat blower motor - passenger cushion
  2. Test for less than 5Ω between the ground circuit terminal 2 and ground.
    • If 5Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • I less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 5Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ignition circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the appropriate component/module listed below.
      • M73A seat blower motor - driver back
      • M73C seat blower motor - driver cushion
      • M73B seat blower motor - passenger back
      • M73D seat blower motor - passenger cushion
      • K50 rear window sunshade module
    • If the test lamp illuminates 
  5. Connect a test lamp between the control circuit terminal 3 and B+.
  6. Verify the test lamp turns ON when pressing the vented seat switch through the high, medium, and low positions then turns OFF when the off position is reached.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X1 harness connector at the K40 Seat memory control module, ignition ON.
    2. Test for less than 1V between the control circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    1. Ignition OFF.
    2. Test for less than 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K40 Seat memory control module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X1 harness connector at the K40 Seat memory 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, replace the K40 Seat memory control module.
  7. Test or replace the M73 blower motor.
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