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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Power Seats) >> Diagnostic Information and Procedures >> Lumbar/Bolster/Massage Malfunction (Lumbar/Bolster/Massage Malfunction (2-Way)) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle OFF, disconnect the connector at the appropriate seat lumbar switch listed below:
    • S65D Front Seat Lumbar Switch - Driver
    • S65P Front Seat Lumbar Switch - Passenger
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Test the appropriate circuit for an open/high resistance:
      • S65D Front Seat Lumbar Switch - Driver = Circuit 2150
      • S65P Front Seat Lumbar Switch - Passenger = Circuit 2250
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    2. Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Ignition/Vehicle in Service Mode.
  4. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.
    • If the test lamp does not illuminate 
    1. Test the appropriate circuit for a short to ground:
      • S65D Front Seat Lumbar Switch - Driver = Circuit 2040
      • S65P Front Seat Lumbar Switch - Passenger = Circuit 740
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Test the appropriate circuit for an open/high resistance:
      • S65D Front Seat Lumbar Switch - Driver = Circuit 2040
      • S65P Front Seat Lumbar Switch - Passenger = Circuit 740
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    3. Verify the fuse is OK and there is voltage at the fuse.
    • Go to next step: If the test lamp illuminates 
  5. Ignition/Vehicle OFF, connect the connector at the S65 Front Seat Lumbar Switch.
  6. Disconnect the connector at the appropriate seat back lumbar motor listed below:
    • M53D Front Seat Back Lumbar Motor - Driver
    • M53P Front Seat Back Lumbar Motor - Passenger
  7. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2 at motor harness.
  8. Ignition/Vehicle in Service Mode.
  9. Verify the test lamp turns ON when commanding the lumbar support Forward and Rearward using the front seat lumbar switch.
    • If the test lamp remains OFF during either of the commands 
    1. Test the appropriate circuits for a short to ground:
      • S65D Front Seat Lumbar Switch - Driver = Circuit 610 and circuit 611
      • S65P Front Seat Lumbar Switch - Passenger = Circuit 210 and circuit 211
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Test the appropriate circuits for an open/high resistance:
      • S65D Front Seat Lumbar Switch - Driver = Circuit 610 and circuit 611
      • S65P Front Seat Lumbar Switch - Passenger = Circuit 210 and circuit 211
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    3. Test or replace the S65 Front Seat Lumbar Switch.
    • Go to next step: If the test lamp turns ON during each of the commands 
  10. Test or replace the M53 Front Seat Back Lumbar Motor.
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