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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 >> Rear Heated 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.

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 K29R Seat Heating Control Module - Rear, 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 K29R Seat Heating Control Module - Rear.
    • 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 2
    • 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 2
    • Terminal 6
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  7. Replace the K29R Seat Heating Control Module - Rear.

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 K29R Seat Heating Control Module - Rear, 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 K29R Seat Heating Control Module - Rear.
    • If the test lamp illuminates 
  3. Ignition OFF and all vehicle systems OFF, connect the X1 harness connector at the K29R Seat Heating Control Module - Rear and disconnect the harness connector at the appropriate E14 Seat Heating Element - Rear Cushion.
    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 K29R Seat Heating Control Module - Rear.
    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 K29R Seat Heating Control Module - Rear.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29R Seat Heating Control Module - Rear, 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 K29R Seat Heating Control Module - Rear.
    • If between 4.8-5.2 V 
  5. Connect a test lamp between control circuit terminal 1 and control circuit terminal 4, engine ON.
    6. NOTE:

    The test lamp should turn ON for approximately 20 s after the heated seat is commanded ON.

  6. Verify the test lamp turns ON after pressing the rear heated seat switch.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the X1 harness connector at the K29R Seat Heating Control Module - Rear.
    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 K29R Seat Heating Control Module - Rear.
    • If the test lamp turns ON 
    7. NOTE:

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

  7. Test or replace the E14 Seat Heating Element - Rear Cushion.

Degraded Heated Seat Operation Left Rear Seat

    NOTE:

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

  1. Ignition OFF, disconnect the harness connector at the E14F Seat Heating Element - Left Rear Cushion. It may take up to 2 min for all vehicle systems to power down.
  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 K29R Seat Heating Control Module - Rear.
    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 K29R Seat Heating Control Module - Rear.
    • If less than 40 Ω 
  3. Ignition ON.
  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 K29R Seat Heating Control Module - Rear.
    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 K29R Seat Heating Control Module - Rear.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29R Seat Heating Control Module - Rear, 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 K29R Seat Heating Control Module - Rear.
    • If between 4.8-5.2 V 
  5. Ignition OFF, connect the harness connector at the E14F Seat Heating Element - Left Rear Cushion and disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
  6. Test for 500 Ω-300 kΩ between the signal circuit terminal 6 and the low reference circuit terminal 1.
    • If not between 500 Ω-300 kΩ 

      Replace the E14F Seat Heating Element - Left Rear Cushion.

    • If between 500 Ω-300 kΩ 
  7. Replace the K29R Seat Heating Control Module - Rear.

Degraded Heated Seat Operation Right Rear Seat

    NOTE:

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

  1. Ignition OFF, disconnect the harness connector at the E14H Seat Heating Element - Right Rear Cushion. It may take up to 2 min for all vehicle systems to power down.
  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 K29R Seat Heating Control Module - Rear.
    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 K29R Seat Heating Control Module - Rear.
    • If less than 40 Ω 
  3. Ignition ON.
  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 K29R Seat Heating Control Module - Rear.
    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 K29R Seat Heating Control Module - Rear.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K29R Seat Heating Control Module - Rear, 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 K29R Seat Heating Control Module - Rear.
    • If between 4.8-5.2 V 
  5. Ignition OFF, connect the harness connector at the E14H Seat Heating Element - Right Rear Cushion and disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
  6. Test for 500 Ω-300 kΩ between the signal circuit terminal 5 and the low reference circuit terminal 2.
    • If not between 500 Ω-300 kΩ 

      Replace the E14H Seat Heating Element - Right Rear Cushion.

    • If between 500 Ω-300 kΩ 
  7. Replace the K29R Seat Heating Control Module - Rear.
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