Control Modules

Manufacturer has found many control modules that have been replaced were not the cause of the problem and replacement of the control module did not correct the problem. Upon examination, these control modules were found to be free of defects. Before replacing a suspect control module, preform the following:

• Before replacing ACC control module, ensure that all user-programming has been cleared. See ACC CONTROL MODULE PROGRAMMING  under PROGRAMMING.
• Ensure all control module power supply and ground circuits are okay and connections are clean and tight. See WIRING DIAGRAMS  .
• Using a scan tool or DVOM ensure control module input and output signal values are reasonable. If replacing ACC control module, see ACC CONTROL MODULE PIN VOLTAGE CHECK  . Before replacing TRIONIC engine control module or DICE control module, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE for specific testing procedures.
• Control modules are sensitive to static electricity. Before touching a control module touch a ground point. Never touch control module pins.
• Connect test light, DVOM or scan tool and wiggle wiring harness at several points and in different directions to detect intermittent opens and/or shorts. See WIRING DIAGRAMS  . Preform repairs as necessary and recheck.
• Using a scan tool, ensure that all functions are operating properly. A fault in one output signal may affect another output signal.
• If problem continues, replace control module with a known-good control module and recheck. Replace control module if problem is corrected.