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Home >> Cadillac >> 1998 >> Seville STS >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnosis & Testing >> DTC U1160: Loss Of Communications With DDM >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform BCM diagnostic system check. See BCM DIAGNOSTIC SYSTEM CHECK  . After performing system check, go to next step.
  2. Using scan tool, attempt to establish communications with DDM. If scan tool communicates with DDM, go to next step. If scan tool does not communicate with DDM, diagnose BCM. See BCM DIAGNOSTIC SYSTEM CHECK  .
  3. Check and repair Class-II serial data line circuit No. 1807 (Purple wire) for intermittent conditions. See WIRING DIAGRAMS  . After repairs, go to next step.
  4. Turn ignition off. Reconnect components and connectors. Turn ignition on. Clear DTCs using scan tool. After clearing DTCs, perform BCM diagnostic system check. See BCM DIAGNOSTIC SYSTEM CHECK  .
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