Chrysler 1997 Stratus Convertible RHD Service Manual page 510

8W - 33 - 4
DESCRIPTION AND OPERATION
CRUISE (VEHICLE SPEED CONTROL)
ENGAGED LAMP . . . . . . . . . . . . . . . . . . . . . . . 4
DESCRIPTION AND OPERATION
VEHICLE SPEED CONTROL
The vehicle speed control system is powered by the
Powertrain Control Module (PCM). The vehicle speed
control switches, located in the steering wheel, use
resistors internal to the switch to send a signal to
the PCM indicating what the operator is requesting.
The V37 circuit, from cavity 41 of the PCM supplies
power for the switch. Circuit Z2 is the ground for the
switch. The Z2 circuit terminates at the instrument
panel left side cowl.
The V37 and Z2 circuits are spliced internal to the
clockspring to provide power and ground for the two
switches.
When the system is turned ON, the vehicle is mov-
ing forward, vehicle speed is above 35 mph (50kph),
and the SET switch is pressed, the PCM looks at the
vehicle speed.
With this information, the PCM sends a signal to
the vehicle speed control servo, on the V36 circuit,
and the servo applies vacuum to hold the desired
speed. Circuit V36 connects to cavity 78 of the PCM.
When the operator selects the COAST feature in
the system, the PCM measures the resistance on the
V37 circuit and uses this information to apply volt-
age on the V35 circuit, which is the vent side of the
vehicle speed control servo. Circuit V35 connects to
cavity 80 of the PCM.
8W - 33 VEHICLE SPEED CONTROL
8W-33 VEHICLE SPEED CONTROL
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INDEX
HELPFUL INFORMATION . . . . . . . . . . . . . . . . . . . 4
VEHICLE SPEED CONTROL . . . . . . . . . . . . . . . . 4
Grounding for the vehicle speed control servo is
supplied on the Z2 circuit. Circuit Z2 terminates at
the left strut tower. An additional input to the servo
is provided by the stop lamp switch on the V30 cir-
cuit. When the operator presses on the brakes the
ground path for the V30 circuit is broken. This break
in the ground path causes the vehicle speed control
servo to vent and disengage the system.
Circuits V32 and K29 are used as inputs to the
PCM to indicate when the operator is applying the
brakes, as vehicle speed control is canceled when this
happens. Circuit V32 connects to cavity 5 of the
PCM. Circuit K29 connects to cavity 62 of the PCM.
CRUISE (VEHICLE SPEED CONTROL) ENGAGED
LAMP
The CRUISE lamp is used to indicate to the oper-
ator when the vehicle speed control is engaged. The
signal to illuminate the lamp is carried over the CCD
Bus from the Body Control Module (BCM).
The BCM receives information on vehicle speed
control engagement from the PCM over the CCD
Bus. This lamp also is illuminated, for a few seconds,
when the ignition switch is moved from the OFF to
the RUN position as a bulb check. The bulb check
operation is controlled by the PCM.
HELPFUL INFORMATION
• Refer to Group 8H for diagnosis procedures
JX
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