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2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H22004 BRAKESwww.4x4us.netwww.4x4us.netAnti-Lock Brake System - Hummer H2SPECIFICATIONSFASTENER TIGHTENING SPECIFICATIONSFastener Tightening SpecificationsSpecificationMetricEnglish5 N.m39 lb in25 N.m18 lb ft9 N.m7 lb ft25 N.m18 lb ft17 N.m12 lb ft10 N.m89 lb in25 N.m18 lb ft25 N.m18 lb ft14 N.m124 lb inApplicationEBCM to BPMV Torx BoltsEHCU Bracket to Frame BoltsEHCU to BracketFront Brake Lines to BPMVFront Wheel Speed Sensor Mounting BoltLongitudinal Accelerometer ScrewMaster Cylinder Brake Lines to BPMVRear Brake Line to BPMVRear Wheel Speed Sensor Mounting BoltSCHEMATIC AND ROUTING DIAGRAMSABS SCHEMATIC ICONSABS Schematic IconsIconIcon DefinitionIMPORTANT:Twisted-pair wires provide aneffective shield that helps protectsensitive electronic componentsfrom electrical interference. If thewires were covered with shielding,install new shielding.In order to prevent electricalinterference from degrading theperformance of the connectedcomponents, you must maintain theproper specification when makingany repairs to the twisted-pair wiresshown :zwww.4x4us.netThe wires must be twisted aminimum of 9www.4x4us.netturns per 31 cm(12 in) as measured anywherealong the length of the wires.HelpmelearnJanuary-01-08 12:06:3312:06:22 PMPage 1 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2www.4x4us.netzThe outside diameterof thewww.4x4us.nettwisted wires must not exceed6.0 mm (0.25 in).ABS uary-01-08 12:06:22 PMPage 2 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2www.4x4us.netwww.4x4us.netFig. 1: EBCM Power, Ground, DLC, Indicator Lamps, and Traction Control SwitchCourtesy of GENERAL MOTORS 01-08 12:06:22 PMPage 3 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2www.4x4us.netwww.4x4us.netFig. 2: Stoplamp Switch and Longitudinal Accelerometer InputsCourtesy of GENERAL MOTORS 01-08 12:06:22 PMPage 4 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2www.4x4us.netwww.4x4us.netFig. 3: Wheel Speed Sensor InputsCourtesy of GENERAL MOTORS CORP.COMPONENT LOCATORABS COMPONENT 01-08 12:06:22 PMPage 5 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2www.4x4us.netwww.4x4us.netFig. 4: ABS Component ViewsCourtesy of GENERAL MOTORS CORP.Callouts For Fig. 4CalloutComponent Name1Longitudinal Accelerometer2Wheel Speed Sensor (WSS) - LR (RR Similar)3Rear Axle Assembly4Chassis Harness5Electronic Brake Control Module (EBCM)6Chassis Harness7Wheel Speed Sensor (WSS) Connector - LF (RF Similar)8Front Console9www.4x4us.netTraction Control Switch10Tow/Haul Switchwww.4x4us.netHelpmelearnJanuary-01-08 12:06:22 PMPage 6 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H211Selectable Ride Switchwww.4x4us.netwww.4x4us.netABS CONNECTOR END VIEWSElectronic Brake Control Module Terminal Identification (EBCM)orConnector Part InformationPinwww.4x4us.netWire Color1BN12191495z 30-Way F GT 150 Series (BK)www.4x4us.netCircuit No.Function882Right Rear Wheel Speed Sensor SignalzHelpmelearnJanuary-01-08 12:06:22 PMPage 7 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer 42234028512554208883087388488511222087Right Rear Wheel Speed Sensor Low Referencewww.4x4us.netNot UsedRight Front Wheel Speed Sensor SignalRight Front Wheel Speed Sensor Low ReferenceCHMSL Supply Voltage/Stop Lamp Supply VoltageNot UsedIgnition 1 VoltageBrake Fluid Level Sensor SignalLNG Rate SignalTraction Control Preference Switch SignalGroundBattery Positive VoltageBattery Positive VoltageGroundTraction Control Preference Switch IndicatorNot UsedLNG Rate Low ReferenceNot UsedLeft Front Wheel Speed Sensor SignalLeft Front Wheel Speed Sensor Low ReferenceLeft Rear Wheel Speed Sensor SignalLeft Rear Wheel Speed Sensor Low ReferenceNot UsedABS/TCS Class 2 Serial DataNot UsedLNG Rate Sensor 5 Volt ReferenceLongitudinal Terminal Identification January-01-08 12:06:22 PMPage 8 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2www.4x4us.netConnector Part InformationPinWire 3270z 3-Way F Bosch SLD (BK)Circuit No.Function2088LNG Rate Low Reference716LNG Rate Signal2087LNG Rate Sensor 5 Volt Referencewww.4x4us.netzTraction Terminal Identification Control SwitchHelpmelearnJanuary-01-08 12:06:22 PMPage 9 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2www.4x4us.netConnector Part InformationPinWire 195z 6-Way F Metri-Pack 150 Series (BK)Circuit No.Function2206Traction Control Preference Switch Signalwww.4x4us.net1851Ground2554Traction Control Preference Switch IndicatorzHelpmelearnJanuary-01-08 12:06:22 PMPage 10 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2DPU/WHwww.4x4us.netEBN/WHFPK1382230639LED Dimming Signal/LED Dimming Supplywww.4x4us.netInstrument Panel Lamps Dimming ControlIgnition 1 VoltageWheel Terminal Identification Speed Sensor (WSS) - LFConnector Part InformationPin www.4x4us.netWire ColorAL-BU12052641z 2-Way F Metri-Pack 150 Series (BK)Circuit No.Functionwww.4x4us.net830Left Front Wheel Speed Sensor SignalzHelpmelearnJanuary-01-08 12:06:22 PMPage 11 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2BYEwww.4x4us.net873Left Front Wheel Speed Sensor Low Referencewww.4x4us.netWheel Terminal Identification Speed Sensor (WSS) - LR12162193z 2-Way F Metri-Pack 150.2 Series Sealed Pull To Seat (BK)PinWire ColorCircuit No.FunctionABK884Left Rear Wheel Speed Sensor SignalBRD885Left Rear Wheel Speed Sensor Low Referencewww.4x4us.netwww.4x4us.netWheel Terminal Identification Speed Sensor (WSS) - RFConnector Part InformationzHelpmelearnJanuary-01-08 12:06:22 PMPage 12 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2www.4x4us.netConnector Part InformationPinABWire ColorD-GNTNwww.4x4us.net12052641z 2-Way F Metri-Pack 150 Series (BK)Circuit No.Function872Right Front Wheel Speed Sensor Signal833Right Front Wheel Speed Sensor Low ReferencezWheel Terminal Identification Speed Sensor (WSS) - 08 12:06:23 PMPage 13 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2www.4x4us.netConnector Part InformationPinABWire ColorBNWHwww.4x4us.net12162193z 2-Way F Metri-Pack 150.2 Series Sealed Pull To Seat (BK)Circuit No.Function882Right Rear Wheel Speed Sensor Signal883Right Rear Wheel Speed Sensor Low ReferencezDIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTICSTARTING POINT - ANTI-LOCK BRAKE -01-08 12:06:23 PMPage 14 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2Begin the system diagnosis with Diagnostic System Check - ABS . The Diagnostic System Check will providewww.4x4us.netwww.4x4us.netthe followinginformation:zzzThe identification of the control modules which command the systemThe ability of the control modules to communicate through the serial data circuitThe identification of any stored diagnostic trouble codes (DTCs) and their statusThe use of the Diagnostic System Check will identify the correct procedure for diagnosing the system andwhere the procedure is located.DIAGNOSTIC SYSTEM CHECK - ABSCircuit DescriptionThe ABS Diagnostic System Check is an organized approach to identify problems associated with the EBCM.This check must be the starting point for any EBCM complaint, and will direct you to the next logical step indiagnosing the complaint. The EBCM is a very reliable component and is not likely the cause of themalfunction. Most system complaints are linked to faulty wiring, connectors, and occasionally to components.Understanding the ABS system and using the tables correctly will reduce diagnostic time and preventunnecessary parts replacement.Test DescriptionThe numbers below refer to the step numbers on the diagnostic table.2: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to atotal malfunction of the class 2 serial data circuit. The specified procedure will determine the particularcondition.4: The presence of DTCs which begin with "U" indicate some other module is not communicating. Thespecified procedure will compile all the available information before tests are performed.Diagnostic System Check - ABSStepActionInstall a scan tool.1 Does the scan tool power up?YesGo to Step 221. Turn ON the ignition, withthe engine OFF.2. Attempt to establishcommunications with thefollowing control modules.z Electronic brakecontrol modulewww.4x4us.net(EBCM)z Powertrain controlNoGo to Scan Tool Does NotPower Up in Data 01-08 12:06:23 PMPage 15 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2module (PCM)www.4x4us.netDoes the scan tool communicatewith all control modules?Select the display DTCs functionon the scan tool for the followingcontrol modules:z3zGo to Step 3Go to Scan Tool Does Notwww.4x4us.netCommunicatewith Class 2Device in Data LinkCommunicationsElectronic brake controlmodule (EBCM)Powertrain control module(PCM)4Does the scan tool display anyDTCs?Does the scan tool display anyDTCs which begin with a "U"?5Does the scan tool display DTCswhich begin with a "B"?6Does the scan tool display DTCswhich begin with a "P"?Go to Symptoms - Anti-lockBrake SystemGo to Step 4Go to Diagnostic TroubleCode (DTC) List in DataLink CommunicationsGo to Step 5Go to Diagnostic TroubleCode (DTC) List in BodyControl SystemGo to Step 6Go to Diagnostic TroubleCode (DTC) List in Engine Go to Diagnostic Trouble Code(DTC) ListElectricalSCAN TOOL OUTPUT CONTROLSScan Tool Output ControlsScan Tool OutputAdditional MenuControlSelection(s)Automated BleedProcedureABS Warning LampLF Inlet ValveSolenoid TestSolenoidLF Outlet ValveSolenoid TestSolenoidLR Inlet ValveSolenoid TestSolenoidLR Outlet ValveSolenoid TestSolenoidRF InletValvewww.4x4us.netSolenoid TestSolenoidDescriptionUsed in order to bleed ABS hydraulics. Refer to ABSAutomated Bleed Procedure .Commands the ABS indicator ON and OFF.Commands the solenoid ON and OFF.Commands the solenoid ON and OFF.Commands the solenoid ON and OFF.Commands the solenoid ON and OFF.Commands the solenoid ON and OFF. www.4x4us.netHelpmelearnJanuary-01-08 12:06:23 PMPage 16 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2RF Outlet Valvewww.4x4us.netSolenoidRR Inlet ValveSolenoidRR Outlet ValveSolenoidSolenoid TestCommands the solenoid ON and OFF. www.4x4us.netSolenoid TestCommands the solenoid ON and OFF.Solenoid TestCommands the solenoid ON and OFF.SCAN TOOL DATA LISTThe EBCM Scan Tool Data Lists contain all the anti-lock brake system related parameters that are available onthe scan tool. The parameters on the list are arranged in alphabetical order. The "Column" data list shows thelocation of the parameter on the scan tool displayed menu selections.Use the EBCM Scan Tool Data Lists as directed by a diagnostic table or in order to supplement the diagnosticprocedures. Begin all the diagnostic procedures with the ABS Diagnostic Starting Point. Use the EBCM ScanTool Data Lists only after the following is determined:zThere is no published DTC procedure nor published symptom procedure for the customer concern.ORzThe DTC or symptom diagnostic procedure indicated by the diagnostic system check does not resolve thecustomer concern.The Typical Data Values are obtained from a properly operating vehicle under the conditions specified in thefirst row of the Scan Tool Data List table. Comparison of the parameter values from the suspect vehicle with theTypical Data Values may reveal the source of the customer concern.EBCM Scan Tool Data ListScan Tool ParameterData ListUnits DisplayedTypical Data ValueIgnition is ON, engine OFF, and vehicle is stationaryABS ActiveABSYes/NoNoBrake Fluid LevelABSOK/LowOKBrake SwitchABSApplied/ReleasedReleasedDRP ActiveABSYes/NoNoDRP DisabledABSYes/NoNoFront TCS Isolation SolenoidTCSActive/InactiveInactiveFront TCS Prime SolenoidTCSActive/InactiveInactiveIgnition Voltage SignalABSVoltsB Left Front Wheel SpeedABSkm/h or mph0Left Rear Wheel SpeedABSkm/h or mph0LF Inlet Valve .4x4us.netLF Outlet Valve SolenoidABSActive/InactiveInactiveLongitudinal AccelerometerTCSVolts0HelpmelearnJanuary-01-08 12:06:23 PMPage 17 2005 Mitchell Repair Information Company, LLC.

2004 Hummer H22004 BRAKES Anti-Lock Brake System - Hummer H2Loose Surface Mode (TC2)www.4x4us.netLR Inlet Valve SolenoidLR Outlet Valve SolenoidPump Motor Relay CommandRear TCS Isolation SolenoidRear TCS Prime SolenoidRF Inlet Valve SolenoidRF Outlet Valve SolenoidRight Front Wheel SpeedRR Inlet Valve SolenoidRR Outlet Valve SolenoidRight Rear Wheel SpeedSolenoid Valve Relay CommandTCS sabled/EnabledActive/InactiveActive/Ina

Fig. 1: EBCM Power, Ground, DLC, Indicator Lamps, and Traction Control Switch Courtesy of GENERAL MOTORS CORP. 2004 Hummer H2 2004 BRAKES Anti-Lock Brake System - Hummer H2