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XJ                                                                      VEHICLE SPEED CONTROL SYSTEM             8H - 1



                         VEHICLE SPEED CONTROL SYSTEM
                                                        CONTENTS

                                                         page

GENERAL INFORMATION
 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1

GENERAL INFORMATION                                                 • Two separate speed control switch modules are
                                                                  mounted on the steering wheel to the left and right
INTRODUCTION                                                      side of the driver’s airbag module. Switch features
   This group covers both Left-Hand Drive (LHD) and               are:
Right-Hand Drive (RHD) versions of this model.                         a. Within the two switch modules, five momen-
Whenever feasible, the RHD versions of affected                     tary contact switches, supporting seven different
vehicle components have been constructed as mirror-                 speed control functions are used.
image of the LHD versions. While most of the illus-                    b. The outputs from these switches are filtered
trations used in this group represent only the LHD                  into one input. The MSA determines which output
version, the diagnostic and service procedures out-                 has been applied through resistive multiplexing.
lined can generally be applied to either version.                   The input circuit voltage is measured by the MSA
Exceptions to this rule have been clearly identified as             to determine which switch function has been
LHD or RHD, if a special illustration or procedure                  selected.
was/is required.                                                       c. A speed control indicator lamp, located on the
   The speed control system used with the 2.5L diesel               instrument panel cluster is energized by the MSA
engine is basically identical to the system used with               via the CCD Bus. This occurs when speed control
gasoline powered engines. Features unique to the                    system power has been turned ON, and the engine
diesel engine will be covered in this section.                      is running.
   • Models equipped with the 2.5L diesel engine do                    d. The two switch modules are labeled: ON/OFF,
not use a vacuum reservoir to retain engine vacuum                  SET, RESUME/ACCEL, CANCEL and COAST.
for speed control operation. There are no vaccum-op-                Refer to the owner’s manual for more information
erated speed control servos used in vehicles with the               on speed control switch functions and setting pro-
2.5L diesel engine.                                                 cedures. The individual switches cannot be
   • The range of the speed control system operation                repaired. If one individual switch fails, the switch
is restricted to speeds between 56 km/h (35 MPH) to                 module must be replaced.
145 km/h (90 MPH).
   • Inputs to the MSA that allow speed control oper-
ation are from the vehicle speed sensor and the
Speed Control Switch.
Exj 8 ha

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Exj 8 ha

  • 1. XJ VEHICLE SPEED CONTROL SYSTEM 8H - 1 VEHICLE SPEED CONTROL SYSTEM CONTENTS page GENERAL INFORMATION INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1 GENERAL INFORMATION • Two separate speed control switch modules are mounted on the steering wheel to the left and right INTRODUCTION side of the driver’s airbag module. Switch features This group covers both Left-Hand Drive (LHD) and are: Right-Hand Drive (RHD) versions of this model. a. Within the two switch modules, five momen- Whenever feasible, the RHD versions of affected tary contact switches, supporting seven different vehicle components have been constructed as mirror- speed control functions are used. image of the LHD versions. While most of the illus- b. The outputs from these switches are filtered trations used in this group represent only the LHD into one input. The MSA determines which output version, the diagnostic and service procedures out- has been applied through resistive multiplexing. lined can generally be applied to either version. The input circuit voltage is measured by the MSA Exceptions to this rule have been clearly identified as to determine which switch function has been LHD or RHD, if a special illustration or procedure selected. was/is required. c. A speed control indicator lamp, located on the The speed control system used with the 2.5L diesel instrument panel cluster is energized by the MSA engine is basically identical to the system used with via the CCD Bus. This occurs when speed control gasoline powered engines. Features unique to the system power has been turned ON, and the engine diesel engine will be covered in this section. is running. • Models equipped with the 2.5L diesel engine do d. The two switch modules are labeled: ON/OFF, not use a vacuum reservoir to retain engine vacuum SET, RESUME/ACCEL, CANCEL and COAST. for speed control operation. There are no vaccum-op- Refer to the owner’s manual for more information erated speed control servos used in vehicles with the on speed control switch functions and setting pro- 2.5L diesel engine. cedures. The individual switches cannot be • The range of the speed control system operation repaired. If one individual switch fails, the switch is restricted to speeds between 56 km/h (35 MPH) to module must be replaced. 145 km/h (90 MPH). • Inputs to the MSA that allow speed control oper- ation are from the vehicle speed sensor and the Speed Control Switch.