Workshop Repair and Service Manuals GMC SIERRA
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Electrical

Underhood Electrical Center or Junction Block Replacement Junction Box      Underhood Electrical Center or Junction Block Replacement Callout Component Name Preliminary Procedure Disconnect the battery. Refer toBattery Negative Cable Disconnection and Connection. 1 Underhood...
Auxiliary Body Control Module Scan Tool Information Body Control Modules      Table 1: Auxiliary Body Control Module Table 2: Auxiliary Body Control Module Scan Tool OutputControls Auxiliary Body Control Module Parameter System State Expected Value Description Operating Conditions:...
Data Link Communications Description and Operation - part 2      Modulesconnected to the GMLAN low speed buss can be part of a virtualnetwork as described in GMLAN High Speed Circuit Description above.The modules on the GMLAN low speed serial data buss are connectedto the buss using several...
Data Link Communications Description and Operation      Circuit Description The communication among control modules is performed throughthe high speed GMLAN serial data circuits and the low speed GMLANserial data circuit. The modules that need real time communicationare attached to...
Body Control System Description and Operation Body Control Modules      The body control system consists of the body control module(BCM), communications, and various input and outputs. Some inputs,outputs and messages require other modules to interact with theBCM. The BCM also has discrete input...
Body Control Module Programming and Setup Body Control Modules      Introduction A new body control module (BCM) must be programmed with the latest operating softwareand vehicle calibrations. Ensure that the following conditions exist in order to preparefor BCM programming: The battery is...
Auxiliary Body Control Module Programming and Setup Body Control Modules      Introduction A new auxiliary body control module (XBCM) must be programmedwith the latest operating software and vehicle calibrations. Ensurethat the following conditions exist in order to prepare for BCMprogramming: The...
Body Control Module Scan Tool Information Body Control Modules - part 2      p> Body Control Module Scan Tool Output Controls Scan Tool Output-Control Additional Menu Selections Description Accy/RAP Relay — This output control is used to command the Accy/RAP relay Onand Off. Backup...
Body Control Module Scan Tool Information Body Control Modules      Table 1: Body Control Module Scan Tool Data Parameters Table 2: Body Control Module Scan Tool Output Controls Body Control Module Scan Tool Data Parameters Parameter System State Expected Value Definition...
Charging System Description and Operation - part 3      Itstargeted APM set-point voltage is12.9–13.2-volts. The BCM will exit this modeonce the criteria are met for Normal Mode. Plant Assembly Mode The BCM will increase charging voltage for the first500-miles of operation in an...
Charging System Description and Operation - part 2      Battery Current Sensor The battery current sensor is a serviceable component that isconnected to the negative battery cable at the battery. The batterycurrent sensor is a 3-wire hall effect current sensor. The batterycurrent...
Charging System Description and Operation      12-Volt Battery The following information is for the 12-Volt batteryonly. For information about charging the high voltage drive motorbatteries, refer toJump Assist Description and Operation. Electrical Power...
Drive Motor Generator Battery Control Module Programming and Setup Alternator Generator      The following service procedures require either a programmingor a setup event be performed for a complete repair. The batteryenergy control module-(BECM) is located inside the drivemotor generator battery assembly, and can be...
Drive Motor Generator Power Inverter Module Programming and Setup Alternator Generator      The following service procedures require either a programmingor a setup event performed for a complete repair. PIM Replacement If the drive motor generator power inverter controlmodule-(PIM) assembly is replaced, the...
Charging System Description and Operation - part 4      The calculated battery current is less than 1-ampere and greaterthan ?7-amperes, and the generator field duty cycle is less than 99-percent. Its targetedgenerator output voltage is 12.9-V. The BCM will exit this mode once the...
Charging System Description and Operation - part 3      Battery Sulfation ModeCharge ModeFuel Economy ModeHeadlamp ModeStart Up ModeVoltage Reduction Mode The engine control module (ECM) controls the generator through the generator turnON signal circuit. The ECM monitors the...
Charging System Description and Operation - part 2      The rectifiedvoltage has been converted into a direct current (DC) for use by the vehicles electricalsystemto maintain electrical loads and the battery charge. The voltage regulator integralto the generator controls the output...
Charging System Description and Operation      Electrical Power Management Overview The electrical power management system is designed to monitor and control the chargingsystem and send diagnostic messages to alert the driver of possible problems withthe battery and...
Drive Motor Generator Control Module Description and Operation Alternator Generator - part 4      An external 12V DC batterycharger is required during the Jump Assist mode because theaccessory DC power control module and vehicle controllers may drawas much as 80-Amps of current from the vehicles12-volt DC system....
Drive Motor Generator Control Module Description and Operation Alternator Generator - part 3      Each motor control module iscontained within the power inverter module. Also contained withinthe power inverter module is the hybrid powertrain control modulemicro-processor. Operating Functions Each motor control module...
Drive Motor Generator Control Module Description and Operation Alternator Generator - part 2      Hybrid Powertrain Control Module Location The hybrid powertrain control module is a non-serviceable,flash-programmable micro-processor contained within the powerinverter module assembly. Operating Functions The hybrid...
Drive Motor Generator Control Module Description and Operation Alternator Generator      Overview The drive motor generator power inverter module assemblyconverts high voltage direct current-(DC) electricalenergy to 3-phase alternating current-(AC)electrical energy. The accessory DC power control module...
Drive Motor Generator Battery Control Module Scan Tool Information HV Battery Control - part 2      table >Scan Tool Output Controls Output Control Description Battery Pack Fan Speed The Battery Pack Fan Speed represents the RPM of the hybrid battery vent fan. TheHybrid Batt Pack Fan Commanded value represents the...
Drive Motor Generator Battery Control Module Scan Tool Information HV Battery Control      Table 1: Scan Tool Data Parameters Table 2: Scan Tool Output Controls The Drive Motor Generator Battery Control Module Scan Tool Data List contains allHybrid Battery related parameters that are available on the...