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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 410 (POWER SEAT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER FOLDING SEAT INOPERATIVECIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C

Circuit/System Testing

2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Power Rear Folding Seats Inoperative

  1. Disconnect the harness connector at either one of the folding seat motors.
  2. Verify that a test lamp illuminates between the B+ circuit terminal A and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, disconnect the X2 harness connector at the left instrument panel (I/P) junction block.
  4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal E2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the EAP fuse #73 is open, test the B+ circuits terminal 1 X8 and terminal 4 X12 for a short to ground.
  5. With the transmission in the PARK position, verify that a test lamp does not illuminate between the control circuit terminal E3 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, refer to the BCM.
  6. Ignition OFF, connect the X2 harness connector at the left I/P junction block. and disconnect the harness connector at the front folding seat switch.
  7. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the circuit tests normal, replace the left I/P junction Block.

Folding Seat Switch Circuit Test

  1. Disconnect the harness connector at the inoperative rear folding seat switch.
  2. Verify that a test lamp illuminates between the appropriate B+ circuit listed below and ground:
    • Front Rear Folding Seat Switch terminal 1
    • Left or Right Rear Folding Seat Switch terminal C
    • If the test lamp does not illuminate test the switch supply circuit for an open or high resistance. If the circuit tests normal replace the left I/P junction block.
  3. If the circuits test normal, test or replace the folding seat switch.

Folding Seat Motor Circuit Test

  1. Ignition OFF, disconnect the harness connector at the inoperative rear folding seat motor.
  2. Test for less than 5 ohms between the ground circuits listed below and ground:
    • Terminal B
    • Terminal D
    • If greater than the specified range, test the ground circuit for an open or high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal A and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open or high resistance.
  4. Connect a test lamp between the signal circuit terminal C and ground.
  5. The test lamp should illuminate while pressing the appropriate rear folding seat switch.
    • If the test lamp does not illuminate, test the signal circuit for an open or high resistance.
  6. If all circuits test normal, test or replace the folding seat motor.
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