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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 >> Front Heated Seat Malfunction (Without Vented Seat KU9) >> 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.

Both Heated Seats are Inoperative

    NOTE:

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

  1. Ignition OFF, disconnect the X1 harness connector at the K29F Seat Heating Control Module - Front, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 7 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp
    2. Test for less than 2 Ω in the B+ 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 OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition/Vehicle OFF, remove the test lamp.
    2. Test for infinite resistance between the B+ 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 the test lamp illuminates 
  3. Ignition OFF.
  4. Test for infinite resistance between each control circuit terminal listed below and ground, one at a time.
    • Terminal 1
    • Terminal 2
    • Terminal 3
    • Terminal 4
    • Terminal 5
    • Terminal 6
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  5. Ignition ON.
  6. Test for less than 1 V between each control circuit terminal listed below and ground, one at a time.
    • Terminal 1
    • Terminal 2
    • Terminal 3
    • Terminal 4
    • Terminal 5
    • Terminal 6
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  7. Replace the K29F Seat Heating Control Module - Front.

One Heated Seat is Inoperative

    NOTE:

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

  1. Ignition OFF, disconnect the X1 harness connector at the K29F Seat Heating Control Module - Front, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 7 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp
    2. Test for less than 2 Ω in the B+ 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 OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the B+ 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 the test lamp illuminates 
    3. NOTE:

    When disconnecting the heating element, choose the easiest one for you to get to.

  3. Ignition OFF, connect the X1 harness connector at the K29F Seat Heating Control Module - Front. Disconnect the harness connector at either the E14 Seat Heating Element - Cushion or the E14 Seat Heating Element - Back.
  4. Connect a test lamp between control circuit terminal 1 and control circuit terminal 4, engine ON.
    5. NOTE:

    After commanding the heated seat ON, the test lamp should turn ON for approximately 10 s then turn OFF.

  5. Verify the test lamp turns ON after pressing the heated seat switch.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the X1 harness connector at the K29F Seat Heating Control Module - Front.
    2. Test for less than 2 Ω in each 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 the test lamp turns ON 
  6. All OK.

One Heating Element is Inoperative

    NOTE:

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

  1. Ignition OFF, disconnect the harness connector at the appropriate E14 Seat Heating Element, ignition ON.
    2. NOTE:

    When performing this test ensure that you are testing from the correct terminal. Testing from the incorrect terminal will cause a misdiagnosis of the circuit. Three of the four terminals in this connector will not only display a voltage reading but a different voltage reading.

  2. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
    2. Test for infinite resistance between the signal 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 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 K29F Seat Heating Control Module - Front.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front, 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, replace the K29F Seat Heating Control Module - Front.
    • If between 4.8-5.2 V 
  3. Connect a test lamp between control circuit terminal 1 and control circuit terminal 4, engine ON.
    4. NOTE:

    After commanding the heated seat ON, the test lamp should turn On for approximately 10 s then turn OFF.

  4. Verify the test lamp turns ON after pressing the heated seat switch.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the X1 harness connector at the K29F Seat Heating Control Module - Front.
    2. Test for less than 2 Ω in each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If the test lamp turns ON 
    5. NOTE:

    Because of the type of material used in the heater element, a reliable resistance value is unavailable for a component test.

  5. Test or replace the E14 Seat Heating Element.

Degraded Heated Seat Operation Driver Seat

    NOTE:

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

  1. Ignition OFF, disconnect the harness connector at each component listed below. It may take up to 2 min for all vehicle systems to power down.
    • E14B Seat Heating Element - Driver Cushion
    • E14A Seat Heating Element - Driver Back
  2. Test for less than 40 Ω between each low reference circuit terminal listed below and ground, one at a time.
    • E14B Seat Heating Element - Driver Cushion terminal 3
    • E14A Seat Heating Element - Driver Back terminal 3
    • If 40 Ω or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
    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 K29F Seat Heating Control Module - Front.
    • If less than 40 Ω 
  3. Ignition ON.
  4. Test for 4.8-5.2 V between each signal circuit terminal listed below and ground, one at a time.
    • E14B Seat Heating Element - Driver Cushion terminal 2
    • E14A Seat Heating Element - Driver Back terminal 2
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
    2. Test for infinite resistance between the signal 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 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 K29F Seat Heating Control Module - Front.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front, 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, replace the K29F Seat Heating Control Module - Front.
    • If between 4.8-5.2 V 
  5. Ignition OFF, connect the harness connector at the E14B Seat Heating Element - Driver Cushion and the E14A Seat Heating Element - Driver Back. Disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
  6. Test for 500 Ω-300 kΩ between the signal circuit and the low reference circuit terminals listed below, one at a time.
    • E14B Seat Heating Element - Driver Cushion terminal 6 and terminal 1
    • E14A Seat Heating Element - Driver Back terminal 3 and terminal 1
    • If not between 500 Ω-300 kΩ 

      Replace the E14 Seat Heating Element.

    • If between 500 Ω-300 kΩ 
  7. Replace the K29F Seat Heating Control Module - Front.

Degraded Heated Seat Operation Passenger Seat

    NOTE:

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

  1. Ignition OFF, disconnect the harness connector at the appropriate component listed below. It may take up to 2 min for all vehicle systems to power down.
    • E14D Seat Heating Element - Passenger Cushion
    • E14C Seat Heating Element - Passenger Back
  2. Test for less than 40 Ω between the low reference circuit terminal 3 and ground.
    • If 40 Ω or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
    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 K29F Seat Heating Control Module - Front.
    • If less than 40 Ω 
  3. Ignition ON.
    4. NOTE:

    When performing this test ensure that you are testing from the correct terminal. Testing from the incorrect terminal will cause a misdiagnosis of the circuit. Three of the four terminals in this connector will not only display a voltage reading but a different voltage reading.

  4. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
    2. Test for infinite resistance between the signal 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 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 K29F Seat Heating Control Module - Front.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front, 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, replace the K29F Seat Heating Control Module - Front.
    • If between 4.8-5.2 V 
  5. Ignition OFF, connect the harness connector at the E14D Seat Heating Element - Passenger Cushion and the E14C Seat Heating Element - Passenger Back. Disconnect the X2 harness connector at the K29 Seat Heating Control Module.
  6. Test for 500 Ω-300 kΩ between the signal circuit and the low reference circuit terminals listed below, one at a time.
    • E14D Seat Heating Element - Passenger Cushion terminal 5 and terminal 2
    • E14C Seat Heating Element - Passenger Back terminal 4 and terminal 12
    • If not between 500 Ω-300 kΩ 

      Replace the E14 Seat Heating Element.

    • If between 500 Ω-300 kΩ 
  7. Replace the K29F Seat Heating Control Module - Front.
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