Chrysler New Yorker. Manual - part 352

Climate Control (Automatic and Manual) system support
Door ajar switch status
Door Lock Inhibit (key in ignition or headlamps/park lamps on)
Electronic Odometer Support
Fog Lamp Control
Headlamp multiplexing control
Headlamp, Park & tail lamps with battery save feature
Headlamp Time Delay
Illuminated Entry with

fade to off

Interior lighting with battery save feature
Mechanical Instrument Cluster (fuel level, dim data, odometer & warning chime) support
Memory system
Overhead travel information system
Power door lock multiplexing control
Rear Window Defogger Control
Remote Keyless Entry with Panic Mode
Remote power decklid release
Rolling door lock control (customer programmable)
Sentry key immobilizer
Vehicle Theft Security System
Wiper Control (speed sensitive with return to park)

The BCM receives information over the PCI Bus from the PCM in order to support certain
features. The required information is as follows:

•

Engine RPM

•

Engine Temperature

•

Injector on Time and Distance Pulses

•

Vehicle Speed

•

Charging System Failure, Engine Temperature Limp-In, VTSS Arming Status

•

Engine Model

•

Check Engine

lamp status

The BCM provides the PCM with information on the A/C switch status, battery temperature which
is determined by the ambient temperature sensor and the

OK to Start

or VTSS status.

The 1999 300M has several customer programmable features which can be disabled or enabled
by the customer.

FEATURE

DEFAULT

PROGRAMMING METHOD

FEEDBACK

Rolling
Door
Locks

Enabled

Close all doors

BCM provides a sin-
gle chime to indicate
completion of the pro-
gramming

Place vehicle key in the ignition and
cycle between off and run four times
ending in the off position

Customer depresses the driver power
door lock switch to lock the doors

Body Controller will toggle the enable/
disable state of rolling locks

RKE —
Horn Chirp

Enabled

Continually press the lock button for a
minimum of 4 seconds to a maximum
of 10 seconds

None

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FEATURE

DEFAULT

PROGRAMMING METHOD

FEEDBACK

Within the 4-10 second range, press
the unlock button while continuing to
press the lock button

Release both buttons

Body Controller will toggle on/off state
of horn chirp feature

RKE — Rear
Release
Toggle

Press
Twice

Continually press the unlock button for
a minimum of 4 seconds to a maxi-
mum of 10 seconds

None

Within the 4-10 second range, press
the rear release button while continu-
ing to press the unlock button

Release both buttons

RKE will toggle state of one press/two
press rear release

RKE —
Program
New FOB
(Using an
already
pro-
grammed
FOB)

Not Appli-
cable

Turn vehicle ignition switch on.
With programmed FOB continually
press the unlock button for a minimum
of 4 seconds to a maximum of 10 sec-
onds

BCM will sound the
chime when program-
ming mode is started

Within the 4-10 second range, press
the panic button while continuing to
press the unlock button

BCM will sound a
second chime after
each FOB has been
learned, a 32 second
time out period has
elapsed, or the vehi-
cle ignition has been
turned off

Release both buttons

Press any button of FOB(S) to be
learned. (Note: RKE system erases all
FOBs when program mode is entered
so any existing FOBs must also be
programmed.

Turn off ignition or
wait for 32 seconds to
exit programming
mode

3.5

Chime System

The chime system is comprised of an audible chime located internal to the BCM; and is
dependent on various inputs to the BCM to operate. These inputs include key-in ignition switch,
exterior lamps, seat belt switch, and requests from the MIC to chime when some indicators are
turned on.

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3.6

Climate Control Systems

3.6.1

Automatic Temperature Control (ATC)

The body control module (BCM) provides automatic temperature control support both through PCI
bus communications and through processing inputs to determine control for actuators and the
blower motor. The BCM interfaces with the ATC control head over the PCI bus. Information on
button activation, blower setting, and temperature setting are supplied to the BCM. In turn, the
BCM supplies the ATC control head with mode information and indication lamp status. The BCM
controls blower motor speed by providing a varying duty cycle of a fixed frequency output (pulse
width modulation). There are 14 distinct blower speeds, plus a blower off signal. The body control
module also controls the HVAC mode, temperature (blend air), and recirculation doors. This
system is either fully automatic or fully manual control (no semi-automatic functions); however, the
temperature blend door control is always automatically controlled based on sensor reading and
comfort setting. The in-car sensor and the aspirator motor are now housed in the ATC control
head.

3.6.2

Manual Temperature Control

The body control module interfaces with the a/c-heater control head via hardwired circuits.
Information for the temperature setting is supplied to the body control module via a potentiometer.
The rear defogger switch, A/C switch and the mode setting is supplied via a resistive multiplexed
circuit. The system on/off status is supplied by a dedicated circuit. The BCM drives the A/C and
rear defogger indicator lamps via hardwire to the A/C-heater control head.

3.6.3

HVAC Blend, Mode, and Recirculation Door Operation

The trouble codes that indicate a stall failure or a feedback signal failure work together to show
what is wrong with the HVAC system. The stall trouble codes mean that the body control module
cannot force an actuator to the end of the HVAC unit door. Internal problems in the body control
module will set other short- related codes. Having only stall trouble codes indicates that there is
a problem with an open or short circuit in the wiring, a bad actuator, a bad HVAC unit door or
connecting linkage. It is important that the operation of the HVAC door be checked if an actuator
is removed. This can be checked by rotating each unit door shaft to confirm that the door will stop
at both ends of travel. The actuator itself has no stops. It must have the HVAC unit door to stop
travel to pass a stall test.

A feedback signal failure can occur on the blend or mode door. The body control module monitors
the feedback signal to check the position of the actuator. The body control module not only checks
the level of the signal but also how much the voltage changes.

A feedback failure can occur if there is a short or open circuit in the wiring, a bad actuator, a bad
body control module, a bad HVAC unit door or connecting linkage. The easiest way to diagnose
this is to use the DRB to actuate the blend or mode door. Note that the feedback voltage of the
actuator should smoothly change as the actuator is moved. A sudden change in the feedback
voltage to a 5.0-volt or a 0.0-volt level indicates the actuator is bad. A fixed feedback voltage that
is less than 5.0 volts or greater than 0.0 volts without a stall failure, or a short failure indicates that
the actuator, the HVAC unit door, or a connecting mechanical linkage is jammed thereby
preventing movement. A feedback signal voltage that stays on 5.0 volts or 0.0 volts indicates a
wiring or body control module problem. The feedback voltage should always be less than 5.0 volts
and greater than 0.0 volts.

The feedback trouble code can also occur from lack of actuator travel. This can be checked by
confirming that the feedback signal smoothly changes when the actuator is moved with the DRB.
If the signal is OK, the door travel is not correct. The actuator must be removed and the HVAC unit
door mechanically checked for proper operation. Typical problems that prevent door movement
include screws dropped in the HVAC unit or warped doors. Replace any part that is found
defective.

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3.6.4

Rear Window Defogger

When the BCM receives a rear defogger request from the climate control head (either ATC or
manual) the BCM will activate the rear window defogger relay for 15 minutes. If the BCM receives
another rear defogger request while the relay is still activated, the relay will be de-activated. If the
relay is allowed to time out (full 15 minutes), further requests during the same ignition on period
will cause the BCM to activate the relay for 7.5 minutes.

3.7

Exterior Lighting System

3.7.1

Exterior Lighting Battery Saver

The BCM monitors the status of and controls the park lamp, head lamp and fog lamp relay’s. If
any exterior lamps are left on after the ignition is turned off, the BCM will turn the headlamps and
fog lamps off after 10 minutes, the park lamps will remain on.

3.7.2

Headlamp Delay

The headlamp time delay operates when the ignition switch is turned off while the headlamps are
still on, and the headlamps are then turned off within 45 seconds after the ignition is off. This will
provide a 90-second time delay before turning off the headlamps.

3.7.3

Headlamp Switch

The headlight switch on 300M vehicles use a multiplexed (MUX) circuit to the BCM. The BCM will
then control the park lamp, head lamp and fog lamp relay’s based on this input.

3.7.4

Fog Lamp Control

The body control module controls the operation of the fog lamp relay which controls the fog lamps.
The fog lamps can only be on if the park or low beam headlamps are on. If the high beams are
turned on, the fog lamps will remain on.

3.8

Interior Lighting

3.8.1

Courtesy Lamp Control

The body controller has direct control over the majority of the vehicle’s courtesy lamps. The body
computer will illuminate the courtesy lamps under any of the following conditions:
1) Any door is ajar.
2) The courtesy lamp switch on the instrument panel is closed.
3) A Remote Keyless entry unlock message is received. If the interior lamps are left on after the
ignition is turned off, the BCM will turn them off after 1 hour or until either the dome lamp switch
or door ajar switch changes state.

3.8.2

Illuminated Entry

Illuminated entry will be initiated when the customer enters the vehicle by unlocking the doors with
the key fob, or with the key if the vehicle is equipped with vehicle theft alarm. Upon exiting the
vehicle, if the lock button is pressed with a door open, illuminated entry will cancel when the door
closes. If the doors are closed and the ignition switch is turned on, the illuminated entry also
cancels.

3.9

Mechanical Instrument Cluster

The instrument cluster displays four gauges, a vacuum fluorescent (VF) odometer, a VF PRNDL
and up to (18) indicators. One reset button is used to switch the display from trip to total. Holding

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