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Home >> GMC >> 2000 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Anti-Theft System - Escalade, Express, Pickup, SAVANA, TAHOE & YUKON DENALI >> Diagnostic Tests >> DTC B2947: PASSLOCK™ Sensor Power Circuit Low >> Diagnostic Procedure

Diagnostic Procedure

  1. Turn ignition off. Disconnect Passlock™ module connector. Check for continuity between Passlock™ module harness connector terminal A5 (Red/White wire) and ground. See Figure. If continuity does not exist, go to next step. If continuity exists, go to step  3.
  2. Replace Passlock™ module. See PASSLOCK™ MODULE  under REMOVAL & INSTALLATION. After repairs, go to step  5.
  3. Disconnect Passlock™ sensor connector at base of steering column. Check for continuity between Passlock™ module harness connector terminal A5 (Red/White wire) and ground. See WIRING DIAGRAMS . See Figure. If continuity does not exist, go to next step. If continuity exists, repair short to ground in Red/White wire.
  4. Replace Passlock™ sensor. See PASSLOCK™ LOCK CYLINDER  under REMOVAL & INSTALLATION. After repairs, go to next step.
  5. Reconnect all connectors and components. Turn ignition on. Using scan tool, clear all DTCs. Perform reprogramming procedure. See PROGRAMMING .
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