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04dakota
Dodge Dakota
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6/15/2004
15:16:39
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 Subject: ForYourInformation
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Message:
CENTRAL TIMER MODULE
DESCRIPTION
Fig. 1 Central Timer Module
1 - CENTRAL TIMER MODULE
2 - COWL SIDE INNER PANEL
3 - SCREW (3)
4 - HEADLAMP AND DASH HARNESS CONNECTOR
5 - INSTRUMENT PANEL AND BODY WIRE HARNESS
CONNECTORS
8E - 2 ELECTRONIC CONTROL MODULES AN
ELECTRONIC CONTROL MODULES (Continued)
Two versions of the Central Timer Module (CTM)
are available on this vehicle. (Fig. 1). Whichever version
of the CTM the vehicle is equipped with, it is
concealed behind the trim on the left cowl side inner
panel below the instrument panel. The base models
are not equipped with the optional power lock system,
the Remote Keyless Entry (RKE) system, the
Vehicle Theft Security System (VTSS), or the remote
radio controls. The high-line version of the CTM are
used on vehicles that are equipped with one or more
of those options.
The CTM utilizes circuitry, and information carried
on the Programmable Communications Interface
(PCI) data bus network, along with many hard wired
inputs to monitor many sensor and switch inputs
throughout the vehicle. In response to those inputs,
the programming of the CTM allow it to supply the
vehicle occupants with audible and visual information,
and to control and integrate many electronic
functions and features of the vehicle through both
hard wired outputs and the transmission of electronic
message outputs to other electronic modules in
the vehicle over the PCI data bus.
The features that the CTM supports or controls
include the following:
² Automatic Door Lock
² Battery Protection
² Central Locking
² Chimes
² Door Lock Inhibit
² Enhanced Accident Response
² Exterior Light Features
² Interior Light Features
² Intermittent Wipe Control
² Panic Mode
² Power Lock Control
² Programmable Features
² Remote Keyless Entry
² Remote Radio Switch Interface
² Speed Sensitive Intermittent Wipe Control
² Vehicle Theft Security System
Hard wired circuitry connects the CTM to the electrical
system of the vehicle. Refer to the appropriate
wiring information.
All versions of the CTM for this model are serviced
only as a complete unit. Many of the features in the
vehicle controlled or supported by the CTM are programmable
using the DRBIIIt scan tool. If any of the
CTM hardware components are damaged or faulty,
the entire CTM unit must be replaced. The hard
wired inputs or outputs of all CTM versions can be
diagnosed using conventional diagnostic tools and
methods. For diagnosis of the CTM or the PCI data
bus, the use of a DRBIIIt scan tool is required. Refer
to the appropriate diagnostic information.
OPERATION
The Central Timer Module (CTM) monitors many
hard wired switch and sensor inputs as well as those
resources it shares with other modules in the vehicle
through its communication over the Programmable
Communications Interface (PCI) data bus network.
The programming and all of the inputs allow the
CTM to determine the tasks it needs to perform and
their priorities, as well as both the standard and
optional features that it should provide. The CTM
then performs those tasks and provides those features
through both PCI data bus communication with
other modules and through hard wired outputs
through a number of driver circuits, relays, and
actuators. These outputs allow the CTM the ability
to control numerous accessory systems.
The CTM operates on battery voltage received
through two fuses in the Junction Block (JB) on two
non-switched fused B(+) circuits, a fused ignition
switch output (run-start) circuit, and a fused ignition
switch output (run-acc) circuit. This arrangement
allows the CTM to provide some features regardless
of the ignition switch position. The CTM is grounded
to the chassis. Two of these ground circuits are on
the left inner cowl panel near the CTM, while the
third is near the Airbag Control Module (ACM).
The CTM monitors its own internal circuitry as
well as many of its input and output circuits, and
will store Diagnostic Trouble Codes (DTC) in memory
for any failure it detects. These DTCs can be
retrieved and diagnosed using a DRBIIIt scan tool.
Refer to the appropriate diagnostic information.
HARD WIRED INPUTS
The hard wired inputs to the CTM include the following:
² Cargo lamp switch sense
² Courtesy lamp switch sense
² Cylinder lock switch sense - high line with VTSS
only
² Driver door ajar switch sense
² Driver door switch mux - high line with power
locks only
² Fog lamp switch sense
² Front washer pump/motor control
² Front wiper park switch sense
² Fused B(+) (two circuits)
² Fused ignition switch output (run-acc)
² Fused ignition switch output (run-start)
² Ground (three circuits)
² Headlamp switch off sense
² High beam switch output
² Interior lamp defeat
² Intermittent front wiper mode sense
² Intermittent front wiper switch signal
² Key-in ignition switch sense
AN ELECTRONIC CONTROL MODULES 8E - 3
CENTRAL TIMER MODULE (Continued)
² Low beam switch output
² Park brake switch sense
² Park lamp switch sense
² Passenger door ajar switch sense
² Passenger door switch mux - high line with
power locks only
² PCI bus circuit
² Radio control mux - high-line with remote radio
switches only
² Washer switch sense
² Wiper park switch sense
² Wiper switch mode sense
² Wiper switch mode signal
HARD WIRED OUTPUTS
The hard wired outputs of the CTM include the following:
² Cargo lamp driver
² Courtesy lamp driver
² Door lock relay output - high-line with power
locks only
² Door unlock relay output - high-line with power
locks only
² Driver door unlock relay output
² Fog lamp relay control - with fog lamps only
² Front washer pump/motor control
² Front wiper park switch sense
² Front wiper relay control
² Glove box lamp driver
² High beam indicator driver
² Horn relay control - high-line with power locks
only
² Interior lamp driver
² Left high beam driver
² Left low beam driver
² Park lamp relay control
² Right high beam driver
² Right low beam driver
² VTSS indicator driver - high-line with VTSS
only
MESSAGING
The CTM uses the following messages received
from other modules over the PCI data bus:
² Airbag Deploy (ACM)
² Beep request (CMTC)
² Charging System Failure (PCM)
² Chime request (EMIC)
² Engine RPM (PCM)
² OK to Arm VTSS (PCM)
² Security indicator request (SKIM)
² System Voltage (PCM)
² Valid/Invalid Key (SKIM)
² Vehicle Distance (PCM)
² Vehicle Speed (PCM)
² Voltage Fault (PCM)
The CTM provides the following messages to other
electronic modules over the PCI data bus:
² Door Ajar Status (EMIC)
² Park Brake Status (CAB, EMIC, TCM)
² Radio Mode (Radio)
² Radio Preset Scan (Radio)
² Radio Seek Down (Radio)
² Radio Seek Up (Radio)
² Radio Volume Down (Radio)
² Radio Volume Up (Radio)
² Ignition Staus
² VTSS Status
² Country Code
DIAGNOSIS AND TESTING - CENTRAL TIMER
MODULE
The hard wired inputs to and outputs from the
Central Timer Module (CTM) may be diagnosed and
tested using conventional diagnostic tools and methods.
Refer to the appropriate wiring information.
However, conventional diagnostic methods may not
prove conclusive in the diagnosis of the CTM. In
order to obtain conclusive testing of the CTM, the
Programmable Communications Interface (PCI) data
bus network and all of the modules that provide
inputs to or receive outputs from the CTM must also
be checked. The most reliable, efficient, and accurate
means to diagnose the CTM, the PCI data bus network,
and the modules that provide inputs to, or
receive outputs from, the CTM requires the use of a
DRBIIIt scan tool. Refer to the appropriate diagnostic
information.
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRUMENT
PANEL COMPONENT DIAGNOSIS OR SERVICE.
DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
8E - 4 ELECTRONIC CONTROL MODULES AN
CENTRAL TIMER MODULE (Continued)
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRUMENT
PANEL COMPONENT DIAGNOSIS OR SERVICE.
DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
NOTE: Before replacing a Central Timer Module
(CTM), use a DRBIIIT scan tool to retrieve the current
settings for the CTM programmable features.
Refer to the appropriate diagnostic information.
These settings should be duplicated in the replacement
CTM using the DRBIIIT scan tool before
returning the vehicle to service.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the trim from the left cowl inner panel.
(Refer to 23 - BODY/INTERIOR/COWL TRIM
COVER - REMOVAL).
(3) Disconnect the wiring harness connectors from
the CTM. (Fig. 2).
(4) Remove the screws that secure the CTM to the
left cowl inner panel.
(5) Remove the CTM from the left cowl inner
panel.
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRUMENT
PANEL COMPONENT DIAGNOSIS OR SERVICE.
DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
NOTE: Before replacing a Central Timer Module
(CTM), use a DRBIIIT scan tool to retrieve the current
settings for the CTM programmable features.
Refer to the appropriate diagnostic information.
These settings should be duplicated in the replacement
high-line/premium CTM using the DRBIIIT
scan tool before returning the vehicle to service.
(1) Position the CTM onto the left cowl inner panel
(Fig. 2).
(2) Install and tighten the screws that secure the
CTM to the left cowl inner panel. Tighten the screws
to 2 N·m (20 in. lbs.).
(3) Reconnect the wiring harness connectors to the
CTM.
(4) Reinstall the trim onto the left cowl side inner
panel. (Refer to 23 - BODY/INTERIOR/COWL TRIM
COVER - INSTALLATION).
(5) Reconnect the battery negative cable.
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