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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 (4-Way Without AHE, AHH, AF6, or AKE)) >> 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 front seat bladder control module listed below. It may take up to 2 min for all vehicle systems to power down.
    • K104D Front Seat Bladder Control Module - Driver
    • K104P Front Seat Bladder Control Module - Passenger
  2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.
    • If 10 Ω or greater 
    1. Test the appropriate circuit for an open/high resistance:
      • K104D Front Seat Bladder Control Module - Driver = Circuit 2150
      • K104P Front Seat Bladder Control Module - 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 1 and ground.
    • If the test lamp does not illuminate 
    1. Test the appropriate circuit for a short to ground:
      • K104D Front Seat Bladder Control Module - Driver = Circuit 2040
      • K104P Front Seat Bladder Control Module - 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:
      • K104D Front Seat Bladder Control Module - Driver = Circuit 2040
      • K104P Front Seat Bladder Control Module - 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 K104 Front Seat Bladder Control Module and disconnect the connector at the appropriate front seat lumbar switch listed below:
    • S65D Front Seat Lumbar Switch - Driver
    • S65P Front Seat Lumbar Switch - Passenger
  6. Test for less than 10 Ω between the low reference circuit terminal 4 and ground.
    • If 10 Ω or greater 
    1. Test the appropriate circuit for an open/high resistance:
      • S65D Front Seat Lumbar Switch - Driver = Circuit 2193
      • S65P Front Seat Lumbar Switch - Passenger = Circuit 2194
      • 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. Replace the appropriate front seat bladder control module listed below:
      • K104D Front Seat Bladder Control Module - Driver
      • K104P Front Seat Bladder Control Module - Passenger
    • Go to next step: If less than 10 Ω 
  7. Ignition/Vehicle in Service Mode.
  8. Test for 4.8 - 5.2 V between the signal circuit terminal 3 and ground.
    • If less than 4.8 V 
    1. Test the appropriate circuit for a short to ground:
      • S65D Front Seat Lumbar Switch - Driver = Circuit 1069
      • S65P Front Seat Lumbar Switch - Passenger = Circuit 1068
      • 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 1069
      • S65P Front Seat Lumbar Switch - Passenger = Circuit 1068
      • 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. Replace the appropriate front seat bladder control module listed below:
      • K104D Front Seat Bladder Control Module - Driver
      • K104P Front Seat Bladder Control Module - Passenger
    • If greater than 5.2 V 
    1. Test the appropriate circuit for a short to voltage:
      • S65D Front Seat Lumbar Switch - Driver = Circuit 1069
      • S65P Front Seat Lumbar Switch - Passenger = Circuit 1068
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found
    2. Replace the appropriate front seat bladder control module listed below:
      • K104D Front Seat Bladder Control Module - Driver
      • K104P Front Seat Bladder Control Module - Passenger
    • Go to next step: If between 4.8 - 5.2 V 
  9. Ignition/Vehicle OFF, connect the connector at the S65 Front Seat Lumbar Switch and disconnect the connector at the K104 Front Seat Bladder Control Module.
  10. Connect a DDM between the signal circuit terminal 6 and the low reference circuit terminal 5.
  11. Test for the resistance values listed below while pressing the appropriate S65 Front Seat Lumbar Switch.
    • 520 - 575 Ω for the lumbar forward switch
    • 1325 - 1465 Ω for the lumbar rearward switch
    • 2680 - 2965 Ω for the lumbar up switch
    • 5340 - 5905 Ω for the lumbar down switch
    • If not between the specified values 

      Test or replace the S65 Front Seat Lumbar Switch.

    • Go to next step: If between the specified values 
  12. Ignition/Vehicle OFF, connect the connector at the K104 Front Seat Bladder Control Module and disconnect the connector at the appropriate front seat back lumbar pump listed below:
    • G31D Front Seat Back Lumbar Pump - Driver
    • G31P Front Seat Back Lumbar Pump - Passenger
  13. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Test the appropriate circuit for an open/high resistance:
      • G31D Front Seat Back Lumbar Pump - Driver = Circuit 2150
      • G31P Front Seat Back Lumbar Pump - 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 
  14. Connect a test lamp between the control circuit terminal 1 and ground.
  15. Ignition/Vehicle in Service Mode.
  16. Verify the test lamp turns ON and OFF when pressing and releasing the lumbar forward switch.
    • If the test lamp remains OFF 
    1. Test the appropriate circuit for a short to ground:
      • G31D Front Seat Back Lumbar Pump - Driver = Circuit 4891
      • G31P Front Seat Back Lumbar Pump - Passenger = Circuit 4890
      • 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:
      • G31D Front Seat Back Lumbar Pump - Driver = Circuit 4891
      • G31P Front Seat Back Lumbar Pump - Passenger = Circuit 4890
      • 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. Replace the appropriate front seat bladder control module listed below:
      • K104D Front Seat Bladder Control Module - Driver
      • K104P Front Seat Bladder Control Module - Passenger
    • If the test lamp is always ON 
    1. Test the appropriate circuit for a short to voltage:
      • G31D Front Seat Back Lumbar Pump - Driver = Circuit 4891
      • G31P Front Seat Back Lumbar Pump - Passenger = Circuit 4890
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found
    2. Replace the appropriate front seat bladder control module listed below:
      • K104D Front Seat Bladder Control Module - Driver
      • K104P Front Seat Bladder Control Module - Passenger
    • Go to next step: If the test lamp turns ON and OFF 
  17. Replace the G31 Front Seat Back Lumbar Pump.
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