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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 960 (Power Seat System) >> Diagnostic Information and Procedures >> Power Seat Inoperative (w/Memory) >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Seat Adjuster Switch Circuit Test

  1. Disconnect the MSM connector C7 and verify that none of the adjuster switch inputs are displayed as Active.
    • If any of the switch inputs are Active, replace the MSM.
  2. Verify that battery voltage is not present at the affected switch signal circuit terminal while the switch is inactive.
    • If battery voltage is present while the switch is not pressed, replace the seat adjuster switch.
  3. Verify that battery voltage is present at the affected switch signal circuit terminal while pressing the switch.
    • If battery voltage is not present while the switch is pressed, repair the switch supply circuit for an open/high resistance. If the circuit tests normal replace the seat adjuster switch.
  4. If the circuits test normal replace the MSM.

Lumbar Switch Circuit Test

  1. Disconnect the MSM connector C6 and verify that none of the lumbar switch inputs are displayed as Active.
    • If any of the switch inputs are Active, replace the MSM.
  2. Verify that battery voltage is not present at the affected switch signal circuit terminal while the switch is inactive.
    • If battery voltage is present while the switch is not pressed, replace the lumbar switch.
  3. Verify that battery voltage is present at the affected switch signal circuit terminal while pressing the switch.
    • If battery voltage is not present while the switch is pressed, repair the switch supply circuit for an open/high resistance. If the circuit tests normal replace the lumbar switch.
  4. If the circuits test normal replace the MSM.

Motor Control Circuit Test

  1. Disconnect the MSM connector C3.
  2. Verify that a test lamp illuminates when connected from the high current battery supply circuit terminal 5 to ground.
    • If the test lamp does not illuminate, repair the high current battery supply circuit for an open or short to ground.
  3. Connect the MSM connector C3 and disconnect the seat adjuster assembly or lumbar adjuster assembly connector C2.
  4. Connect a test lamp across the affected motor control circuit terminals.
  5. Verify that the test lamp illuminates while the affected switch is pressed.
    • If the test lamp does not illuminate, repair the motor control circuits for an open/high resistance. If the circuits test normal replace the MSM.
  6. If the circuits test normal replace the affected adjuster assembly.
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