Control Module References

Control Module	Repair Instructions	Diagnostic System Check	Schematics
ATC Automatic Transfer Case	Refer to Transfer Case Shift Control Module Replacement Two Speed Automatic Refer to Transfer Case Shift Control Module Replacement Selectable in Automatic Transfer Case	Refer to Diagnostic System Check - Transfer Case Two Speed Automatic Refer to Diagnostic System Check - Transfer Case Two Speed Manual Refer to Diagnostic System Check - Transfer Case Selectable in Automatic Transfer Case	Refer to Transfer Case Control Schematics Two Speed Automatic Refer to Transfer Case Control Schematics Two Speed Manual Refer to Transfer Case Control Schematics Selectable in Automatic Transfer Case
BCM Body Control Module	Refer to Body Control Module Replacement in Body Control System	Refer to Diagnostic Starting Point - Body Control System in Body Control Systems	Refer to Body Control System Schematics in Body Control System
EBCM Electronic Brake Control Module	Refer to Electronic Brake Control Module Replacement in Antilock Brake System	Refer to Diagnostic System Check - ABS in Antilock Brake System	Refer to Antilock Brake System Schematics in Antilock Brake System
IPC Instrument Panel Cluster	Refer to Instrument Cluster Replacement in Instrument Panel, Gauges, and Console	Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges, and Console	Refer to Instrument Cluster Schematics in Instrument Panel, Gauges, and Console
PCM Powertrain Control Module	Refer to Powertrain Control Module Replacement 4.3 Engine Refer to Powertrain Control Module Replacement 4.8, 5.3, and 6.0 Engines Refer to Powertrain Control Module Replacement 8.1 Engine in Engine Controls	Refer to Diagnostic System Check - Engine Controls 4.3 Engine Refer to Diagnostic System Check - Engine Controls 4.8, 5.3, and 6.0 Engines Refer to Diagnostic System Check - Engine Controls 6.6 Diesel Engine Refer to Diagnostic System Check - Engine Controls 8.1 Engine in Engine Controls	Refer to Engine Controls Schematics 4.3 Engine Refer to Engine Controls Schematics 4.8, 5.3, and 6.0 Engines Refer to Engine Controls Schematics 6.6 Diesel Engine Refer to Engine Controls Schematics 8.1 Engine in Engine Controls
SDM Inflatable Restraint Sensing and Diagnostic Module	Refer to Airbag Sensing and Diagnostic Module Replacement in SIR	Refer to Diagnostic System Check - SIR in SIR	Refer to SIR Schematics (Except 30 Series Pickup) , SIR Schematics (Utility) , SIR Schematics (30 Series Pickup) in SIR
SCM Suspension Control Module/Real Time Damping	Refer to Electronic Suspension Control Module Replacement (Suburban/Yukon XL) , Electronic Suspension Control Module Replacement (Tahoe/Yukon) in Real Time Damping (RTD)	Refer to Diagnostic System Check - Real Time Damping in Real Time Damping (RTD)	Refer to Suspension Controls Schematics in Real Time Damping (RTD)
HVAC Control Module	Refer to Heater and Air Conditioning Control Replacement (Heat and A/C) , Heater and Air Conditioning Control Replacement (Heat Only) in HVAC - Manual Refer to HVAC Control Module Replacement in HVAC - Automatic	Refer to Diagnostic System Check - HVAC Systems - Automatic in HVAC - Automatic	Refer to HVAC Schematics (Compressor Controls - All Models) , HVAC Schematics (Blower Controls - Auxiliary) , HVAC Schematics (Blower Controls - Primary) , HVAC Schematics (Air Delivery Controls - Auxiliary) , HVAC Schematics (Air Delivery Controls - Primary) in HVAC - Manual Refer to HVAC Schematics (Compressor Controls - All Models) , HVAC Schematics (Air Delivery Controls - Auxiliary) , HVAC Schematics (Air Delivery Controls - Primary) , HVAC Schematics (Blower Controls - Auxiliary) , HVAC Schematics (Blower Controls - Primary) in HVAC - Automatic
OnStar®/Cellphone Communications	Refer to OnStar Vehicle Communication Unit Replacement Refer to OnStar Vehicle Interface Unit Replacement in Cellular Communications	Refer to Diagnostic System Check - Cellular Communication in Cellular Communications	Refer to OnStar Schematics in Cellular Communications
MSM Memory Seat Module	Refer to Memory Seat Control Module Replacement in Seats	-	Refer to Memory Seats Schematics in Seats
DIC Driver Information Center	-	Refer to Diagnostic System Check - Driver Information Systems in Instrument Panel Gauges and Console	Refer to Instrument Panel, Gauges, and Console Schematic Icons in Instrument Panel Gauges and Console
Allison Automatic Transmission	Refer to Transmission Control Module Replacement in Automatic Transmission - Allison	-	Refer to Automatic Transmission Controls Schematics in Automatic Transmission - Allison