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Home >> Chevrolet >> 1998 >> Corvette 2D Convertible, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Testing - Diagnostic >> DTC U1153: Loss Of Communication With HVAC >> Diagnostic Aids

Diagnostic Aids

  1. The following conditions may cause an intermittent: Intermittent open or short in serial data line, intermittent loss of communication with HVAC system, or damaged or loose star connector terminals.
  2. If serial data line is shorted to ground or voltage, all systems connected to same serial data line will not be capable of communicating properly. Systems capable of storing loss of communication DTCs will store these codes in their memory. After DTC U1153 is repaired, clear all DTCs from each system capable of storing this DTC.
  3. If DTC U1153 is set in IPC memory, use a scan tool to monitor communications with HVAC system. If IPC loses communication with HVAC system at any time, DTC U1153 is stored in IPC. Test drive vehicle to aid in diagnosing an intermittent condition. Check for open in serial data line between only IPC and HVAC system. Also check IPC and HVAC system for intermittent operation due to a loss of power or ground.
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