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Home >> Chevrolet >> 2000 >> Cutaway 6.5 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Anti-Theft System) >> Diagnostic Tests >> DTC B2957: PASSLOCK(tm) SENSOR DATA CIRCUIT LOW >> Diagnostic Procedure

Diagnostic Procedure

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  1. Connect scan tool. Momentarily rotate ignition switch to START position (do not start engine). Release ignition switch to ON position. With scan tool, observe Passlock(tm) data voltage in BCM security data list. If voltage is not 0.4-4.9 volts, go to next step. If voltage is 0.4-4.9 volts, problem is intermittent. See DIAGNOSTIC AIDS  .
  2. Turn ignition switch to OFF position. Disconnect Passlock(tm) sensor connector. Turn ignition switch to RUN position, engine off. With scan tool, observe Passlock(tm) data voltage in BCM security data list. If voltage is not greater than 4.9 volts, go to next step. If voltage is greater than 4.9 volts, go to step  5 .
  3. Check Yellow wire between Passlock(tm) sensor connector terminal D3 and BCM connector C1, terminal B3 for short to ground or poor connections. See WIRING DIAGRAMS  . If problem is found, repair as necessary. After repairs, go to step  6 . If problem is not found, go to next step.
  4. Replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to step  6 .
  5. Check Passlock(tm) sensor connector for poor connections. If connections are okay, replace Passlock(tm) sensor. See appropriate STEERING COLUMN SWITCHES article. Perform auto learn procedure. See PROGRAMMING  . After repairs, go to next step.
  6. Use scan tool to clear DTCs. Recheck BCM for DTCs. If DTCs do not reset, system is okay.
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