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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 548 (ADJUSTABLE PEDAL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESADJUSTABLE PEDALS MALFUNCTION (WITHOUT AN3)CIRCUIT/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 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the left IP junction block.
  2. Test for less than 10 Ξ© between the ground circuit terminal D1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the 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 circuit fuse is open, test the motor control circuits and the switch control circuits for a short to ground.
  4. Transmission in reverse, verify that a test lamp illuminates between the control circuit terminal E3 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Ignition OFF, connect the X2 harness connector at the left IP junction block and disconnect the harness connector at the adjustable pedal switch.
  6. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 11 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the left IP junction block.
  7. Ignition OFF, connect the harness connector at the adjustable pedal switch and disconnect the X2 harness at the left IP junction block.
  8. Ignition ON, verify a test lamp does not illuminate between the control circuit terminals listed below and ground:
    • Control circuit terminal E1
    • Control circuit terminal G1
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the adjustable pedal switch.
  9. Adjustable pedal switch in the FWD position, verify a test lamp illuminates between the control circuit terminal G1 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the adjustable pedal switch.
  10. Adjustable pedal switch in the RWD position, verify a test lamp illuminates between the control circuit terminal E1 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the adjustable pedal switch.
  11. Ignition OFF, connect the X2 harness connector at the left IP junction block and disconnect the harness connector at the adjustable pedal assembly.
  12. Test for less than 10 Ξ© between the control circuit terminals listed below and ground:
    • Control circuit terminal 4
    • Control circuit terminal 5
    • If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, replace the left IP junction block.
  13. Ignition ON, verify a test lamp does not illuminate between the control circuit terminals listed below and ground:
    • Control circuit terminal 4
    • Control circuit terminal 5
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the left IP junction block.
  14. Adjustable pedal switch in the FWD position, verify a test lamp illuminates between the control circuit terminal 5 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground. If the circuit tests normal, replace the left IP junction block.
  15. Adjustable pedal switch in the RWD position, verify a test lamp illuminates between the control circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground. If the circuit tests normal, replace the left IP junction block.
  16. If all circuits test normal, test or replace the adjustable pedal assembly.
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