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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 272 (Power Seat System) >> Diagnostic Information and Procedures >> Lumbar/Bolster Malfunction (Driver or Passenger Seat with W2E) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Lumbar/Bolster Pump Always ON Circuit Test

  1. Ignition OFF, disconnect the harness connector at the appropriate G31 Seat Lumbar/Bolster Pump.
  2. Ignition ON.
  3. Verify a test lamp does not illuminate between the control circuit terminal 1 and ground.
    • If the test lamp illuminates 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K134 Seat Bolster Memory Control Module, 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, replace the K134 Seat Bolster Memory Control Module.
    • If the test lamp does not illuminate 
  4. All OK.

Lumbar/Bolster Module Circuit Test

  1. Ignition OFF, all vehicle systems OFF, disconnect the harness connector at the appropriate K134 Seat Bolster Memory Control Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 3 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 B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate 
    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
    3. 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 not open and there is voltage at the fuse.
    • If the test lamp illuminates 
  5. Ignition OFF, connect the harness connector at the K134 Seat Bolster Memory Control Module and disconnect the harness connector at the G31 Seat Lumbar/Bolster Pump.
  6. Test for less than 10 Ω between the ground circuit terminal 3 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 
  7. Connect a test lamp between the control circuit terminal 1 and ground, ignition ON.
  8. Verify the test lamp turns ON when pressing and holding the seat 4-way switch in the forward direction.
    • If the test lamp remains OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K134 Seat Bolster 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
    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 K134 Seat Bolster Memory Control Module.
    • If the test lamp turns ON 
  9. Test or replace the G31 Seat Lumbar/Bolster Pump.
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