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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 336 (Seat Heating System And Seat Cooling System) >> Diagnostic Information and Procedures >> Vented Seat Malfunction >> Circuit/System Testing

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.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate seat blower motor listed below. It may take up to 2 min for all vehicle systems to power down.
    • M73C Seat Blower Motor - Driver Cushion
    • M73A Seat Blower Motor - Driver Back
    • M73D Seat Blower Motor - Passenger Cushion
    • M73B Seat Blower Motor - Passenger Back
  2. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 3 and ground.
    • If the test lamp does not illuminate 
    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
    3. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp illuminates 
  5. Test for less than 1 V between the control circuit terminal 1 and B+.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
    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 K29F Seat Heating Control Module - Front.
    • If less than 1 V 
  6. Ignition ON.
  7. Test for 9 V or greater between the control circuit terminal 1 and B+ after pressing the vented seat switch.
    • If less than 9 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front and the other M73 Seat Blower Motor - Back or Cushion, 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
    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 K29F Seat Heating Control Module - Front.
    • If 9 V or greater 
  8. Replace the M73 Seat Blower Motor.
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