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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 U1016: Loss Of Class 2 Communication With VCM >> Diagnostic Procedure

Diagnostic Procedure

  1. Turn ignition off. Disconnect 16-pin Passlock™ module connector. Measure resistance of Purple wire between Passlock™ module harness connector terminal B4 and DLC terminal No. 2. See Figure. If resistance is less than 10 ohms, replace Passlock™ module. See PASSLOCK™ MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step. If resistance is 10 ohms or more, repair open in Purple wire. See WIRING DIAGRAMS . After repairs, go to next step.
  2. Reconnect all connectors and components. Turn ignition on. Using scan tool, clear all DTCs. Perform reprogramming procedure. See PROGRAMMING .
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