4A-1 Brake Control System and Diagnosis:
Brake Control System and Diagnosis
General Description
Hydraulic Brake System Description and
Operation
System Component Description
The hydraulic brake system consists of the following:
Hydraulic Brake Master Cylinder Fluid Reservoir:
Contains supply of brake fluid for the hydraulic brake
system.
Hydraulic Brake Master Cylinder:
Converts
mechanical input force into hydraulic output
pressure.
Hydraulic output pressure is distributed from the
master cylinder through two hydraulic circuits,
supplying diagonally-opposed wheel apply circuits.
Hydraulic Brake Pressure Balance Control System:
Regulates brake fluid pressure delivered to hydraulic
brake wheel circuits, in order to control the
distribution of braking force.
Pressure balance control on non-ABS equipped
vehicles, is achieved through a proportioning valve
assembly.
Pressure balance control on ABS equipped vehicles,
is achieved through dynamic rear proportioning
(DRP), which is a function of the ABS modulator.
Refer to “ABS Description and Operation: ” in
Antilock Brake System for specific information on the
operation of DRP.
Hydraulic Brake Pipes and Flexible Brake Hoses:
Carries brake fluid to and from hydraulic brake
system components.
Hydraulic Brake Wheel Apply Components:
Converts hydraulic input pressure into mechanical
output force.
System Operation
Mechanical force is converted into hydraulic pressure by
the master cylinder, regulated to meet braking system
demands by the pressure balance control system, and
delivered to the hydraulic brake wheel circuits by the
pipes and flexible hoses. The wheel apply components
then convert the hydraulic pressure back into
mechanical force which presses linings against rotating
brake system components.
Brake Assist System Description and
Operation
System Component Description
The brake assist system consists of the following:
Brake Pedal:
Receives, multiplies and transfers brake
system input force from driver.
Brake Pedal Pushrod:
Transfers multiplied input force
received from brake pedal to brake booster.
Vacuum Brake Booster:
Uses source vacuum to
decrease effort required by driver when applying
brake system input force.
When brake system input force is applied, air at
atmospheric pressure is admitted to the rear of both
vacuum diaphragms, providing a decrease in brake
pedal effort required. When input force is removed,
vacuum replaces atmospheric pressure within the
booster.
Vacuum Source:
Supplies force used by vacuum brake
booster to decrease brake pedal effort.
Vacuum Source Delivery System:
Enables delivery
and retention of source vacuum for vacuum brake
booster.
System Operation
Brake system input force is multiplied by the brake pedal
and transferred by the pedal pushrod to the hydraulic
brake master cylinder. Effort required to apply the brake
system is reduced by the vacuum brake booster.
Brake Warning System Description and
Operation
Brake Warning Indicator
The instrument panel cluster (IPC) illuminates the Red
Brake Warning indicator when one or more of the
following occurs.
• The body control module (BCM) detects that the park
brake is engaged.
• The IPC detects a low brake fluid condition. The IPC
receives a low brake fluid signal from the low brake
fluid switch in the master cylinder reservoir requesting
illumination.
• The electronic brake control module (EBCM) detects
an ABS malfunction which disables dynamic rear
proportioning (DRP). The IPC receives a GMLAN
message from the EBCM requesting illumination.
• The IPC performs the bulb check at the start of each
ignition cycle. The Red Brake Warning indicator
illuminates for approximately 3 seconds before turning
OFF.
• The IPC detects a loss of GMLAN communications
with the EBCM.
Содержание 2007 XL7
Страница 1: ...SERVICE MANUAL 99500S78J00 33E 2007 JC636...
Страница 4: ......
Страница 6: ......
Страница 12: ...00 5 Precautions...
Страница 110: ...1A 5 Engine General Information and Diagnosis Module Power Ground and MIL...
Страница 111: ...Engine General Information and Diagnosis 1A 6 5 Volt Reference...
Страница 112: ...1A 7 Engine General Information and Diagnosis Low Reference...
Страница 113: ...Engine General Information and Diagnosis 1A 8 Mass Air Flow and Engine Coolant Temperature Sensor...
Страница 114: ...1A 9 Engine General Information and Diagnosis Camshaft Position Sensors and Actuators...
Страница 115: ...Engine General Information and Diagnosis 1A 10 Heated Oxygen Sensors...
Страница 116: ...1A 11 Engine General Information and Diagnosis Throttle Actuator Control and Accelerator Pedal Position Sensor...
Страница 117: ...Engine General Information and Diagnosis 1A 12 Ignition Coils...
Страница 118: ...1A 13 Engine General Information and Diagnosis Knock Sensors and Crank Sensor...
Страница 119: ...Engine General Information and Diagnosis 1A 14 Fuel Injectors and Fuel Pump...
Страница 120: ...1A 15 Engine General Information and Diagnosis Evaporative Emissions and Fuel Tank Pressure Sensor...
Страница 121: ...Engine General Information and Diagnosis 1A 16 Controlled Monitored Systems...
Страница 747: ...Engine Cooling System 1F 4 Engine Cooling Schematics...
Страница 874: ...1I 2 Starting System Starting...
Страница 875: ...Starting System 1I 3 Charging...
Страница 900: ...1J 7 Charging System Starting...
Страница 901: ...Charging System 1J 8 Charging...
Страница 1098: ...2D 34 Wheels and Tires...
Страница 1158: ...3C 2 Transfer Transfer Case Control...
Страница 1216: ...3D 29 Propeller Shafts...
Страница 1221: ...Brake Control System and Diagnosis 4A 2 Schematic and Routing Diagram...
Страница 1222: ...4A 3 Brake Control System and Diagnosis Hydraulic Brake Schematics...
Страница 1226: ...4A 7 Brake Control System and Diagnosis Park Brake Assembly 1 Park Brake Switch 3 Floor Panel 2 Park Brake Handle...
Страница 1286: ...4B 14 Front Brakes Front Brake Caliper Replacement...
Страница 1289: ...Front Brakes 4B 17 Front Disc Brake Hardware Replacement...
Страница 1316: ...4C 14 Rear Brakes Rear Brake Caliper Replacement...
Страница 1355: ...ABS 4E 5 Serial Data Traction Switch and Instrument Panel...
Страница 1356: ...4E 6 ABS Wheel Speed Sensor...
Страница 1357: ...ABS 4E 7 Yaw Rate and Lateral Accelerator Sensor and Steering Angle Sensor...
Страница 1363: ...ABS 4E 13 Near the Brake Booster 1 Brake Fluid Level Switch 3 Electronic Brake Control Module EBCM 2 LF Strut Tower...
Страница 1366: ...4E 16 ABS Rear ABS Sensors 1 Rear Cradle 3 Wheel Speed Sensor WSS RR 2 Wheel Speed Sensor WSS LR...
Страница 1406: ...4E 56 ABS...
Страница 1421: ...Automatic Transmission 5A 11 Park Engine Running...
Страница 1424: ...5A 14 Automatic Transmission Reverse...
Страница 1427: ...Automatic Transmission 5A 17 Reverse Inhibit...
Страница 1430: ...5A 20 Automatic Transmission Neutral Engine Running...
Страница 1433: ...Automatic Transmission 5A 23 Drive and M Range First Gear...
Страница 1436: ...5A 26 Automatic Transmission M Range First Gear Engine Braking...
Страница 1439: ...Automatic Transmission 5A 29 Drive and M Range Second Gear...
Страница 1442: ...5A 32 Automatic Transmission Drive and M Range Third Gear...
Страница 1445: ...Automatic Transmission 5A 35 Drive Range Fourth Gear...
Страница 1448: ...5A 38 Automatic Transmission Drive Range Fifth Gear TCC Released...
Страница 1451: ...Automatic Transmission 5A 41 Drive Range Fifth Gear TCC Applied...
Страница 1453: ...Automatic Transmission 5A 43 Drive Range Emergency Fifth Gear...
Страница 1455: ...Automatic Transmission 5A 45 Power and Ground...
Страница 1456: ...5A 46 Automatic Transmission ISS OSS and TFT Sensors...
Страница 1457: ...Automatic Transmission 5A 47 Shift and Pressure Solenoids...
Страница 1458: ...5A 48 Automatic Transmission Shift Lock Control Schematics...
Страница 1812: ...6C 30 Power Assisted Steering System...
Страница 1821: ...Heating Ventilation and Air Conditioning 7A 7 Module Power Ground Serial Data and Front Blower Controls...
Страница 1822: ...7A 8 Heating Ventilation and Air Conditioning Air Temperature Sensors Ambient Light Sensor...
Страница 1823: ...Heating Ventilation and Air Conditioning 7A 9 Mode Recirculation and Temperature Actuators...
Страница 1824: ...7A 10 Heating Ventilation and Air Conditioning Rear HVAC Controls and Actuators...
Страница 1825: ...Heating Ventilation and Air Conditioning 7A 11 A C Compressor Controls...
Страница 1989: ...Seat Belts 8A 3 Seat Belt Schematics...
Страница 2018: ...8B 6 Air Bag System SIR Schematics...
Страница 2019: ...Air Bag System 8B 7 Power Ground Roll Over Sensor and PPS...
Страница 2020: ...8B 8 Air Bag System Modules and Sensors...
Страница 2021: ...Air Bag System 8B 9 Pretensioners and Front End Sensor...
Страница 2072: ...8B 60 Air Bag System Inflatable Restraint Instrument Panel Module Replacement...
Страница 2119: ...Wiring Systems 9A 11 Capacitor Battery Variable Battery Resistor Variable Resistor OLD Symbol NEW Symbol Description...
Страница 2120: ...9A 12 Wiring Systems Position Sensor I O Resistors I O Switches Diode Heating Element OLD Symbol NEW Symbol Description...
Страница 2121: ...Wiring Systems 9A 13 Motor Solenoid Coil Antenna Twisted Wires OLD Symbol NEW Symbol Description...
Страница 2124: ...9A 16 Wiring Systems B BUS 1 of 2...
Страница 2125: ...Wiring Systems 9A 17 B BUS 2 of 2...
Страница 2126: ...9A 18 Wiring Systems ABS ABS MTR AUX PWR AWD ECMBAT PWR OUTLET REAR APO REAR HVAC and TCM BAT Fuses...
Страница 2127: ...Wiring Systems 9A 19 BATT MAIN 1 CAN VENT CLSTR HVAC BLOWER INFO INT LTS ONSTAR REAR DEFOG and RVC Fuses...
Страница 2128: ...9A 20 Wiring Systems AMP BCM CHMSL DIMR HVAC RFA and RDO Fuse...
Страница 2129: ...Wiring Systems 9A 21 AOS MODULE BATT MAIN 2 HTD SEATS L GATE LT TRN SIG PWR MIRS RT TRN SIG and SIR Fuses and...
Страница 2130: ...9A 22 Wiring Systems POWER SEATS Circuit Breaker...
Страница 2131: ...Wiring Systems 9A 23 BATT MAIN 3 DR LCK RRWPR RSE KEY CAPTR and S ROOF Fuses and POWER WNDW...
Страница 2132: ...9A 24 Wiring Systems IGN SWITCH Fuse and Ignition Switch...
Страница 2133: ...Wiring Systems 9A 25 PWR TRN BUS ETC ECM EVEN COILS INJ AND ODDCOILS INJ Fuses...
Страница 2134: ...9A 26 Wiring Systems PWR TRN BUS EMM DEV1 EMM DEV2...
Страница 2135: ...Wiring Systems 9A 27 RUN CRANK BUS MAF PCM IGN SIR DISPLAY and TRANS Fuses...
Страница 2136: ...9A 28 Wiring Systems DRL DRL2 FOG LP LH HIGH BEAM LH LOW BEAM RH HIGH BEAM and RH LOW BEAM Fuses...
Страница 2137: ...Wiring Systems 9A 29 LH PRK LP RH PRK LP and RH PRK LP TRLR Fuses...
Страница 2138: ...9A 30 Wiring Systems HORN LH TRLR STOP TURN RH TRLR STOP TURN and STOP LP Fuses...
Страница 2139: ...Wiring Systems 9A 31 Power Moding Schematics...
Страница 2140: ...9A 32 Wiring Systems Power Moding...
Страница 2141: ...Wiring Systems 9A 33 Ignition Lock Schematics...
Страница 2142: ...9A 34 Wiring Systems Ground Distribution Schematics...
Страница 2143: ...Wiring Systems 9A 35 G101...
Страница 2144: ...9A 36 Wiring Systems G103 G105 G107 G108 and G109...
Страница 2145: ...Wiring Systems 9A 37 G201...
Страница 2146: ...9A 38 Wiring Systems G203 and G205...
Страница 2147: ...Wiring Systems 9A 39 G301...
Страница 2148: ...9A 40 Wiring Systems G311...
Страница 2149: ...Wiring Systems 9A 41 G401...
Страница 2150: ...9A 42 Wiring Systems G403...
Страница 2151: ...Wiring Systems 9A 43 Trailer Connector Provision Schematics...
Страница 2152: ...9A 44 Wiring Systems Trailer Wiring...
Страница 2153: ...Wiring Systems 9A 45 Harness Routing Views Forward Lamp Harness 1 C109 4 G101 2 C110 5 C101 3 C108...
Страница 2154: ...9A 46 Wiring Systems Body Harness Engine Compartment 1 C102 2 C101...
Страница 2155: ...Wiring Systems 9A 47 Battery Cable Harness 1 C102 3 G103 2 Battery Current Sensor...
Страница 2156: ...9A 48 Wiring Systems Engine Harness Front 1 S110 5 S105 2 S109 6 S100 3 S108 7 G107 4 S107 8 C106...
Страница 2157: ...Wiring Systems 9A 49 Engine Harness Top of Engine 1 S115 3 S106 2 S114...
Страница 2158: ...9A 50 Wiring Systems Fuel Injector and Transmission Harness 1 C105 3 S101 2 S104...
Страница 2160: ...9A 52 Wiring Systems Console Harness 1 S301 3 C202 2 S300 4 C305...
Страница 2162: ...9A 54 Wiring Systems Headliner and Sunroof Harness 1 C415 3 C417 U3U 2 C412 UUC...
Страница 2165: ...Wiring Systems 9A 57 Liftgate Harness 1 C900 4 C906 2 C901 5 S908 3 S902 6 Rear WIndow Wiper Motor Connector...
Страница 2236: ...9A 128 Wiring Systems Front of the Engine Compartment 1 Fuse Block Underhood 3 Cooling Fan Left 2 Battery 4 Cooling Fan Right...
Страница 2238: ...9A 130 Wiring Systems G112 1 Rear Exhaust Manifold 2 G112...
Страница 2239: ...Wiring Systems 9A 131 G107 and G105 1 G107 3 G105 2 Front Cylinder Head 4 Starter...
Страница 2240: ...9A 132 Wiring Systems Engine Harness Rear 1 G108 2 G109...
Страница 2325: ...Lighting Systems 9B 4 Headlights Daytime Running Lights DRL Schematics...
Страница 2326: ...9B 5 Lighting Systems Fog Lights Schematics...
Страница 2327: ...Lighting Systems 9B 6 Exterior Lights Schematics...
Страница 2328: ...9B 7 Lighting Systems Left Park Lamps...
Страница 2329: ...Lighting Systems 9B 8 License Lamps Right Park Lamps...
Страница 2330: ...9B 9 Lighting Systems Turn Signal Lamps...
Страница 2331: ...Lighting Systems 9B 10 Stop Lamps...
Страница 2332: ...9B 11 Lighting Systems Backup Lamps...
Страница 2333: ...Lighting Systems 9B 12 Trailer Tow Connector...
Страница 2334: ...9B 13 Lighting Systems Interior Lights Schematics...
Страница 2335: ...Lighting Systems 9B 14 Interior Lights Dimming Schematics...
Страница 2348: ...9B 27 Lighting Systems Pedal Assemblies 1 Brake Pedal Position Sensor 2 Accelerator Pedal Position APP Sensor...
Страница 2439: ...Instrumentation Driver Info Horn 9C 8 Indicators...
Страница 2440: ...9C 9 Instrumentation Driver Info Horn Gages...
Страница 2441: ...Instrumentation Driver Info Horn 9C 10 Driver Information System Schematics...
Страница 2442: ...9C 11 Instrumentation Driver Info Horn Audible Warnings Schematics...
Страница 2443: ...Instrumentation Driver Info Horn 9C 12 Cigar Lighter Power Outlet Schematics...
Страница 2444: ...9C 13 Instrumentation Driver Info Horn Horn Schematics...
Страница 2449: ...Instrumentation Driver Info Horn 9C 18 Horn Component Views Horn Location 1 Horn...
Страница 2513: ...Wipers Washers 9D 2 Front Wiper Washer...
Страница 2514: ...9D 3 Wipers Washers Rear Wiper Washer...
Страница 2554: ...9E 6 Glass Windows Mirrors Moveable Window Schematics...
Страница 2555: ...Glass Windows Mirrors 9E 7 Defogger Schematics...
Страница 2556: ...9E 8 Glass Windows Mirrors Inside Rearview Mirror Schematics...
Страница 2557: ...Glass Windows Mirrors 9E 9 Outside Rearview Mirror Schematics...
Страница 2565: ...Glass Windows Mirrors 9E 17 Rear Window Defogger 1 Rear Defogger Grid 2 Liftgate...
Страница 2566: ...9E 18 Glass Windows Mirrors RR Door 1 Window Switch RR 3 Window Motor RR 2 Door Latch RR...
Страница 2567: ...Glass Windows Mirrors 9E 19 LR Door 1 Door Latch LR 3 Window Motor LR 2 Window Switch LR...
Страница 2570: ...9E 22 Glass Windows Mirrors Mirror Component Views Top of the Windshield 1 Inside Rearview Mirror ISRVM 2 Hood...
Страница 2627: ...Security and Locks 9F 6 Schematic and Routing Diagram Door Lock Indicator Schematics...
Страница 2628: ...9F 7 Security and Locks Door Lock Motors and Relays...
Страница 2629: ...Security and Locks 9F 8 Door Latches and Switches...
Страница 2630: ...9F 9 Security and Locks Release Systems Schematics...
Страница 2631: ...Security and Locks 9F 10 Remote Function Schematics...
Страница 2632: ...9F 11 Security and Locks Theft Deterrent System Schematics...
Страница 2633: ...Security and Locks 9F 12 Theft Deterrent...
Страница 2640: ...9F 19 Security and Locks LR Door 1 Door Latch LR 3 Window Motor LR 2 Window Switch LR...
Страница 2641: ...Security and Locks 9F 20 RR Door 1 Window Switch RR 3 Window Motor RR 2 Door Latch RR...
Страница 2643: ...Security and Locks 9F 22 Liftgate Latch Location 1 Liftgate Latch...
Страница 2689: ...Seats 9G 3 Driver Seat Schematics...
Страница 2690: ...9G 4 Seats Heated Cooled Seat Schematics...
Страница 2813: ...Sun Roof T Top Convertible Top 9I 3 Sunroof Schematics...
Страница 2955: ...Body Structure 9K 63 Body Side Opening Underbody...
Страница 2988: ...9O 7 Cellular Entertainment Navigation Audio Radio UC1...
Страница 2989: ...Cellular Entertainment Navigation Audio 9O 8 Radio U65...
Страница 2990: ...9O 9 Cellular Entertainment Navigation Audio Speaker U65...
Страница 2991: ...Cellular Entertainment Navigation Audio 9O 10 Digital Radio Receiver U2K...
Страница 2992: ...9O 11 Cellular Entertainment Navigation Audio Steering Wheel Controls...
Страница 2993: ...Cellular Entertainment Navigation Audio 9O 12 Power Ground and Video Signal...
Страница 2994: ...9O 13 Cellular Entertainment Navigation Audio Audio Signals...
Страница 2995: ...Cellular Entertainment Navigation Audio 9O 14 Steering Wheel Secondary Configurable Control Schematics...
Страница 2996: ...9O 15 Cellular Entertainment Navigation Audio Remote Radio Steering Wheel Controls UK3...
Страница 3007: ...Cellular Entertainment Navigation Audio 9O 26 Below the LR Window 1 Digital Radio Receiver U2K 3 LR Wheel Panel 2 Rear Floor...
Страница 3061: ...Cruise Control System 10A 3 Cruise Control Schematics...
Страница 3064: ...10A 6 Cruise Control System Pedal Assemblies 1 Brake Pedal Position Sensor 2 Accelerator Pedal Position APP Sensor...
Страница 3081: ...Data Communications 10B 5 Low Speed GMLAN...
Страница 3082: ...10B 6 Data Communications High Speed GMLAN...
Страница 3083: ...Data Communications 10B 7 Body Control System Schematics...
Страница 3084: ...10B 8 Data Communications Power and Ground Starting and Charging...
Страница 3085: ...Data Communications 10B 9 Exterior LIghts Radio Data Communications ABS Automatic Transmission and Ignition Lock...
Страница 3086: ...10B 10 Data Communications Shift Lock Headlights Cruise Wiper and I P...
Страница 3087: ...Data Communications 10B 11 Interior Lights Door Locks Exterior Lights Release Systems Movable Windows and Horns...
Страница 3121: ...Immobilizer Control System 10C 2 Vehicle Theft Deterrent...
Страница 3150: ...10D 13 Tire Pressure Monitoring System...
Страница 3159: ...Prepared by 1st Ed Dec 2006 3154...