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Home >> Cadillac >> 2017 >> XTS Base >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Power Seat System >> Diagnostic Information and Procedures >> Lumbar Support Malfunction (With Seat Bolster Memory Control Module) >> Circuit/System Testing
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Circuit/System Testing

  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 4 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 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K134 Seat Bolster Memory Control Module.
    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, replace the K134 Seat Bolster Memory Control Module.
    • 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 for approximately 1 min after pressing and holding the lumbar forward switch for 3 s.
    • 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. Replace the G31 Seat Lumbar/Bolster Pump.
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