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DTC U1064: Loss Of Communications With BCM

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. Test battery positive voltage circuits to Body Control Module (BCM) for open or short to ground conditions. See WIRING DIAGRAMS  . If faulty circuit is found and repaired, go to step  5 . If circuits are okay, go to next step.
  2. Test ground circuits to BCM for open conditions. See WIRING DIAGRAMS  . If faulty circuit is found and repaired, go to step  5 . If circuits are okay, go to next step.
  3. Check for poor connection of power or ground circuits at BCM connectors. If poor connections are found and repaired, go to step  5 . If connections are okay, go to next step.
  4. Replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  5. Using scan tool, check BCM DTCs. If scan tool shows any DTCs for BCM that begin with "U", go to BCM DTC DEFINITIONS  table under SELF-DIAGNOSTIC SYSTEM. If scan tool does not show any DTCs for BCM that begin with "U", go to next step.
  6. Using scan tool, clear DTCs. Continue diagnosing and clearing DTCs until all DTCs have been cleared. After repairs, go to DATA LINK CONNECTIONS DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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