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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1316 (Adjustable Pedal System) >> Diagnostic Information and Procedures >> Adjustable Pedals Inoperative (with AN3) >> Circuit/System Testing >> Adjustable Pedal Switch Circuit Malfunction

Adjustable Pedal Switch Circuit Malfunction

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the harness connector at the adjustable pedal switch.
  2. Ignition ON, test for 11.8-12.2 volts between the appropriate 12-volt reference circuit listed below and ground:
    • X88/Z88 - terminal 11
    • Z75 - terminal 5
    • If greater than the specified range, test the 12-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
    • If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  3. Verify the scan tool Pedal Forward Switch parameter is Inactive.
    • If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the MSM.
      • X88/Z88 - terminal 12
      • Z75 - terminal 6
  4. Verify the scan tool Pedal Aft Switch parameter is Inactive.
    • If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the MSM.
      • X88/Z88 - terminal 10
      • Z75 - terminal 4
  5. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Forward Switch parameter should be Active.
    • X88/Z88 - terminal 12
    • Z75 - terminal 6
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  6. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Aft Switch parameter should be Active.
    • X88/Z88 - terminal 10
    • Z75 - terminal 4
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  7. If all circuits test normal, test or replace the adjustable pedal switch.
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