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DTC B2957: Security System Sensor Data Circuit Low: Testing

WARNING: This page is about a different car, the 1999 Pontiac Grand Am and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If circuit is shorted to ground, fuse will blow. Check fuse before performing diagnostics.
  1. Perform THEFT DETERRENT DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS. Go to next step.
  2. Disconnect BCM connector C2. Disconnect Passlock(R) sensor connector. Using DVOM, measure resistance between Passlock(R) terminal "A" (Yellow wire) and ground. See WIRING DIAGRAMS  . If reading is infinite resistance (OL), go to step  4 . If any resistance is indicated, go to next step.
  3. Repair short to ground in Yellow wire between BCM and Passlock(R) cylinder. After repairs, go to step  12 .
  4. Check for poor connection at BCM connector C2. If poor connection is found, go to next step. If connections are okay, go to step  6 .
  5. Repair poor connection at BCM connector C2. After repairs, go to step  12 .
  6. Check for poor connection at Passlock(R) connector terminal "A" (Yellow wire). If poor connection is found, go to next step. If connections are okay, go to step  9 .
  7. Repair poor connection at Passlock(R) connector terminal "A" (Yellow wire). After repairs, go to step  12 .
  8. Using scan tool, monitor BCM security data parameter Passlock(R) voltages. If zero volts is displayed, go to next step. If any voltage is displayed, check for intermittent short to voltage.
  9. Turn ignition off. Disconnect BCM connector C2. Turn ignition on. Using scan tool, observe BCM security data parameter Passlock(R) voltages. Observe Passlock(R) power data values. If 5 volts is displayed, go to next step. If other than 5 volts is displayed, go to step  11 .
  10. Replace Passlock(R) sensor. See IGNITION SWITCH  under REMOVAL & INSTALLATION. After repairs, go to step  12 .
  11. Replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  12. Using scan tool, clear DTCs. Go to THEFT DETERRENT DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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