B1988

Step 1: Perform visual inspection of pedal position switch wiring harness from BCM to pedal assembly, checking for chafed, pinched, or damaged wires especially where harness passes through firewall or near metal edges. Check for signs of wire repair or moisture intrusion.

Step 2: Disconnect pedal position forward switch connector at pedal assembly and inspect terminals for corrosion, bent pins, or signs of overheating. Using a digital multimeter, measure voltage on the switch signal circuit with connector disconnected and ignition on - should read 0 volts; if battery voltage is present, wiring harness has short to power.

Step 3: With connector still disconnected, check resistance of pedal position forward switch between signal pin and ground pin (consult manufacturer specifications, typically 1-10k ohms depending on position). If open circuit or infinite resistance, switch is faulty.

Step 4: If wiring tests good, reconnect switch and monitor live data for pedal position switch status while manually moving pedal assembly through its range. Erratic readings or constant high voltage indicates switch failure.

Step 5: If all components test correctly, perform BCM power and ground verification, checking for proper voltage supply and ground integrity at BCM connector. Test BCM signal circuit for proper pull-down resistance (typically 1-10k ohms to ground internally).

Step 6: Clear codes, cycle ignition, and verify repair by operating pedal adjustment system through full range and monitoring for code return. Road test if equipped with power-adjustable accelerator pedal.