GM Service Manual Online
For 1990-2009 cars only

Control Module

Repair Instructions

Diagnostic System Check

Schematic

Body Control Module

BCM

Refer to Body Control Module Replacement

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Refer to Body Control System Schematics

Electronic Climate Control Module

ECCM

Refer to HVAC Control Module Replacement in HVAC Systems - Automatic

Refer to Diagnostic System Check - HVAC Systems - Automatic in HVAC Systems - Automatic

Refer to HVAC Schematics in HVAC Systems - Automatic

Driver Information Center

DIC

Refer to Driver Information Center Module Replacement in Instrument Panel, Gauges and Console

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Refer to Driver Information System Schematics in Instrument Panel, Gauges and Console

Memory Seat Module

MSM

Refer to Memory Seat Control Module Replacement in Seats

Refer to Diagnostic System Check - Power Seat Systems in Seats

Refer to Memory Seats Schematics in Seats

Instrument Panel Cluster

IPC

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

Inflatable Restraint Sensing and Diagnostic Module

SDM

Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement in SIR

Refer to Diagnostic System Check - SIR in SIR

Refer to SIR Schematics in SIR

Electronic Brake Control Module

EBCM

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

Vehicle Interface Unit

VIU

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

Transfer Case Shift Control Module

TCSCM

    • Refer to Transfer Case Shift Control Module Replacement in Transfer Case-NVG 136-NP4 (One Speed Automatic)
    • Refer to Transfer Case Shift Control Module Replacement in Transfer Case-NVG 233-NP1 (Two Speed Selectable)
    • Refer to Transfer Case Shift Control Module Replacement in Transfer Case-NVG 236/246-NP8 (Two Speed Automatic)
    • Refer to Diagnostic System Check - Transfer Case in Transfer Case-NVG 136-NP4 (One Speed Automatic)
    • Refer to Diagnostic System Check - Transfer Case in Transfer Case-NVG 233-NP1 (Two Speed Selectable)
    • Refer to Diagnostic System Check - Transfer Case in Transfer Case-NVG 236/246-NP8 (Two Speed Automatic)
    • Refer to Transfer Case Control Schematics in Transfer Case-NVG 136-NP4 (One Speed Automatic)
    • Refer to Transfer Case Control Schematics in Transfer Case-NVG 233-NP1 (Two Speed Selectable)
    • Refer to Transfer Case Control Schematics in Transfer Case-NVG 236/246-NP8 (Two Speed Automatic)

Powertrain Control Module

PCM

    • Refer to Powertrain Control Module Replacement in Engine Controls - 2.2L
    • Refer to Powertrain Control Module Replacement in Engine Controls - 4.3L
    • Refer to Diagnostic System Check - Engine Controls in Engine Controls - 2.2L
    • Refer to Diagnostic System Check - Engine Controls in Engine Controls - 4.3L
    • Refer to Engine Controls Schematics in Engine Controls - 2.2L
    • Refer to Engine Controls Schematics in Engine Controls - 4.3L