LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saturn >> 2000 >> SC2 Automatic, MP7 >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Anti-Theft System) >> Trouble Shooting >> Pass-Key(R) System Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Pass-Key(R) System Check

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install scan tool. Establish communication with BCM and check for DTCs. If communication cannot be established, see appropriate BODY CONTROL MODULES article. If DTC B2721, B2722, B2723 or B2735 is stored, see SELF-DIAGNOSTIC SYSTEM  . If no DTCs are stored, go to next step.
  2. Turn ignition switch to ON position. Using scan tool, select BCM INPUT DATA 1 and display PASS-Key(R) state. If scan tool displays PASS-Key(R) state as MONITOR PASS-KEY(R), go to step  5 . If scan tool does not display PASS-Key(R) state as MONITOR PASS-KEY(R), go to next step.
  3. Using scan tool, select BCM INPUT DATA 1 and display PASS-Key(R) state. Check for the following PASS-Key(R) states:
    • Normal Decision
    • Fail Enable
    • Fail Enable Decision
    • Tamper

    If scan tool displayed any of these states, go to step  8 . If scan tool did not display any of these states, go to next step.

  4. Using scan tool, select BCM INPUT DATA 1 and display PASS-Key(R) state. Check for the following PASS-Key(R) states:
    • Auto Lrn Pend
    • Seed Lrn Pend
    • Auto Learn
    • Seed Key Learn

    If scan tool displayed any of these states, go to step  7 . If scan tool did not display any of these states, go to step  6 .

  5. Place transmission in Park (A/T) or press clutch (M/T). Using a valid PASS-Key(R), attempt to start engine. If engine starts, system is okay. If engine does not crank, go to step  9 .
  6. Check the following for intermittent malfunctions:
    • Incorrect or damaged PASS-Key(R) resistor.
    • Foreign material on PASS-Key(R) resistor.
    • Poor connections or contacts at lock cylinder.
    • Open or short in the PASS-Key(R) circuit.

    If problem was found, correct and retest system. If no problem was found, see STARTERS - CORVETTE article in STARTING & CHARGING SYSTEMS.

  7. Reprogram PASS-Key(R) system. See PROGRAMMING  .
  8. Check ignition key lock cylinder. See TEST A: IGNITION KEY LOCK CYLINDER TEST  under SYSTEM TESTS. If problem was not found, go to step  7 .
  9. Repair malfunction in engine cranking system. See STARTERS - CORVETTE article in STARTING & CHARGING SYSTEMS.
scientia non olet · About LEMON Manuals