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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (Power Seat System) >> Diagnostic Information and Procedures >> Lumbar Support Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate S65 Seat Lumbar Support Switch. 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 H and ground.
    • If 10 Ω or greater 
    1. 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 E and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    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 not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    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 greater than 10 Ω between each control circuit listed below and ground:
      • Lumbar forward control circuit terminal A
      • Lumbar rearward control circuit terminal D
      • If 10 Ω or less, disconnect the harness connector at the M53 Seat Lumbar Support Motor and retest to verify if the short is in the circuit or the component.
      • If greater than 10 Ω, test or replace the S65 Seat Lumbar Support Switch.
    • If the test lamp illuminates 
  5. Ignition OFF, connect the harness connector at the S65 Seat Lumbar Support Switch and disconnect the harness connector at the M53 Seat Lumbar Support Motor.
  6. Connect a test lamp between control circuit terminal A and control circuit terminal B, ignition ON.
  7. Verify the test lamp turns ON when commanding the lumbar support Forward and Rearward using the S65 Seat Lumbar Support Switch.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, disconnect the harness connector at the S65 Seat Lumbar Support Switch.
    2. Test for infinite resistance between each 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 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 S65 Seat Lumbar Support Switch.
    • If the test lamp remains ON during either of the commands 
    1. Ignition OFF, disconnect the harness connector at the S65 Seat Lumbar Support Switch, 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 S65 Seat Lumbar Support Switch.
    • If the test lamp turns ON during each of the commands 
  8. Test or replace the M53 Seat Lumbar Support Motor.
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