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Has it ever worked? Possibility no positive supply or ground at data link connector. Need to locate a wiring diagram for your connector. Try google.if you don't have a diagram.
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Your best bet , take it to a qualified repair shop that has a diagnostic scanner that can check for DTC'S - diagnostic trouble code's an input's from the fob's an messaging from the passenger door module to the BCM. Does the power window & power locks work for the passenger door ? If so , it's not a fuse .
The keyless entry system has the following main components:
• The transmitters
• The passenger door module (PDM)
The PDM communicates with the body control module (BCM) through the keyless entry serial data circuit. When you press a button on a transmitter, the transmitter sends a signal to the PDM. The PDM sends a request to the BCM and the BCM performs the appropriate function.
Diagnostic System Check - Remote Keyless Entry
The numbers below refer to the step numbers on the diagnostic table.
Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed. Any other body control module DTCs displayed by the scan tool do not apply to Remote Keyless Entry and should be diagnosed in the applicable section.
Install a scan tool.
Does the scan tool power up?
YES - Go to Step 2
NO - Go to Scan Tool Does Not Power Up in Data Link Communications
2
Turn ON the ignition, with the engine OFF.
Attempt to establish communication with the following control modules.
• body control module
• passenger door module
Does the scan tool communicate with all of the listed control modules?
It could be the coolant level sensor. Is there any internal damage to reservior. Is there a loose or dirty wire connection on the side or bottom of the reservior. Is this reservoir located on passenger side near firewall?
With all of the electrical problems your having , your best bet would be to take it to a ASE certified repair shop ! Because the first place to start is hooking a professional grade scan tool to see if all the modules on the vehicle are communicating with the scan tool an each other ! I don't know the existent of your knowledge of your vehicle ! Your vehicle has at lest ten computers onboard an they all communicate on a serial data communication network , Class2
The data link connector (DLC) allows a scan tool to communicate with the class 2 serial data line. This serial data line is the means by which the microprocessor-controlled modules in the vehicle communicate with each other. Once the scan tool is connected to the class 2 serial data line through the DLC, the scan tool can be used to monitor each module for diagnostic purposes and to check for diagnostic trouble codes (DTCs). Class 2 serial data is transmitted on a single wire at an average of 10.4 kbps. This value is an average, class 2 uses a variable pulse width modulation to carry data and depending on the message it may operate faster or slower. The bus will float at a nominal 7.0 volts during normal operation. Each module can pull this lower during the transmission. The bus is not at battery positive voltage or ground potential during normal operation. When the ignition switch is in RUN, each module communicating on the class 2 serial data line sends a state of health (SOH) message every 2 seconds to ensure that the module is operating properly. When a module stops communicating on the class 2 serial data line, for example if the module loses power or ground, the SOH message it normally sends on the data line every 2 seconds disappears. Other modules on the class 2 serial data line, which expect to receive that SOH message, detect its absence; those modules in turn set an internal DTC associated with the loss of SOH of the non-communicating module. The DTC is unique to the module which is not communicating, for example, when the inflatable restraint sensing and diagnostic module (SDM) SOH message disappears, several modules set DTC U1088. Note that a loss of serial data DTC does not normally represent a failure of the module that set it.
. The ignition on you caddy has a safety system known as Electronic Park Lock (EPL)/Ignition Lock Cylinder Control Actuator for floor shift or Linear Shift Assembly: If the vehicle is equipped with a column mounted gear shift, it has a linear shift assembly on the steering column. The linear shift assembly has a cable that runs from the linear shift assembly to the ignition lock cylinder case. The purpose of this cable is to prevent the ignition key from being turned to the OFF position when the transmission is in gear and the vehicle may still be moving. The linear shift assembly cable contains a pin that is spring loaded to mechanically prevent the ignition key cylinder from being turned to the lock position when the vehicle transmission is not in the PARK position. If vehicle power is lost, and/or the transmission is not in the PARK position the operator will not be able to turn the ignition key to the lock position and will not be able to remove the ignition key from the column.
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the dash integration module (DIM). The PMM receives 2 signals from the ignition switch.
To determine the correct power mode the PMM uses the following circuits
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Accessory voltage
The IPC calculates the mileage based on the vehicle speed signal circuit from the powertrain control module (PCM). The odometer will display ERROR if an internal IPC memory malfunction is detected or there is a class 2 communication fault. The odometer displays either miles or kilometers as requested by the activation of the English/metric button on the driver information center (DIC). The associated indicator (km or MI) illuminates.
You probably have A class 2 serial data communication malfunction. All the Modules on your vehicle talk, share information on the data network an if something brings it down ,shorts it out, the vehicle will not start .
The data link connector (DLC) allows a scan tool to communicate with the class 2 serial data line. The DLC is a standardized 16 way connector located below the instrument panel and close to the steering column. Both the connector design and location are dictated by industry wide agreements. All DLCs are required to provide a power supply, hot at all times, to terminal 16. This circuit is used to power the scan tool. All DLCs supply a power ground at terminal 4 and a signal ground at terminal 5. The class 2 serial data circuit is provided at terminal 2 of the DLC.
You probably need to take this to a ASE certified repair shop or the a GM dealership ! Because if you are asking here you probably don't know about this stuff, an you sure don't have a factory scan tool to see which modules have DTC'S - diagnostic trouble codes stored .
You
Print The data link connector is a dedicated diagnostic scan tool connector. It is located in the engine compartment against the fire wall. It links the engine controller to the Diagnostic Readout Box (DRBII) scan tool or the Mopar Diagnostic System (MDS), or any other Chrysler-compatible diagnostic scan tool. Here's a link to the codes.Tyler,join the A.Z.site at top right corner,it's free,then you can use there repair guides like me.
Data Link Connector (DLC)
The data link connector (DLC) contains the following serial data links:
• Class II
• Entertainment and Comfort (E&C)
The DLC also provides a power source for the scan tool as follows:
• Unswitched voltage (B+) at DLC terminal 16 (circuit 1450)
• Ground at terminal 4 (circuit 1450) and terminal 5 (circuit 1550)
Class II Serial Data Link
The class II serial data link allows the following modules to communicate data with each other:
• Body control module (BCM)
• Electronic brake traction control module (EBTCM)
• Heater-A/C control (if equipped with RPO CJ2)
• Instrument panel cluster (IPC)
• Powertrain control module (PCM)
• Inflatable Restraint Sensing and Diagnostic Module (SDM).
The Class II serial data link allows a Scan Tool scan tool to communicate with the above modules for diagnostic and testing purposes. The Class II serial data link is located at the DLC connector terminal 2. Terminal 2 consists of the following circuits:
• Circuit 1036
• Circuit 1037
• Circuit 1128
• Circuit 1049
• Circuit 1122
• Circuit 1132
Entertainment and Comfort (E&C) Serial Data Link
The entertainment and comfort (E&C) serial data link allows a scan tool to communicate with the radio or the mobile telephone handset the remote CD player (if equipped). This communication is for diagnostic and testing purposes. The E&C serial data link is located at the DLC connector terminal 14, circuit 835.
PIN #9 goes to the air bag module .
Do you know how to do electrical testing using a wiring diagram and a DVOM - digital volt ohmmeter ? Do you know how complex the electronic's are on your vehicle are . Could be something simple but then again may not be . Hooking up a professional type scan tool that can check for DTC'S in all the modules on the vehicle would be the first step in diagnosing this ! Do you know what a electronic control module is ? Your vehicle can set hundreds of code's an they don't all turn on the check engine light . Moving the ignition switch to the CRANK position sends a 12 V signal to the PCM Ignition Crank Sense. The PCM verifies that the transmission is in the PARK or NEUTRAL position. The PCM then grounds the control circuit of the START relay. When the START relay is energized it allows voltage to the starter solenoid S terminal.Do you know what Data Link Communications are ?
The data link connector (DLC) allows a scan tool to communicate with the class 2 serial data line. The serial data line is the means by which the microprocessor-controlled modules in the vehicle communicate with each other. Once the scan tool is connected to the class 2 serial data line through the DLC, the scan tool can be used to monitor each module for diagnostic purposes and to check for diagnostic trouble codes (DTCs). Class 2 serial data is transmitted on a single wire at an average of 10.4 kbps. This value is an average; class 2 uses a variable pulse width modulation to carry data and depending on the message it may operate faster or slower. The bus will float at a nominal 7 volts during normal operation. Each module can pull this lower during the transmission. The bus is not at battery positive voltage or ground potential during normal operation. When the ignition switch is in RUN, each module communicating on the class 2 serial data line sends a state of health (SOH) message every 2 seconds to ensure that the module is operating properly. When a module stops communicating on the class 2 serial data line, for example, if the module loses power or ground, the SOH message it normally sends on the data line every 2 seconds disappears. Other modules on the class 2 serial data line, which expect to receive that SOH message, detect its absence; those modules in turn set an internal DTC associated with the loss of SOH of the non-communicating module. The DTC is unique to the module which is not communicating; for example, when the inflatable restraint sensing and diagnostic module (SDM) SOH message disappears, several modules set DTC U1088. Note that a loss of serial data DTC does not normally represent a failure of the module that set it.
Your best bet would be to have a qualified repairs shop check it out .
PLEASE DON'T FORGET TO RATE!!!!
Data Link Connector
OBD II Systems use a standardized test connector called the Data Link Connector (DLC). It is located beneath the instrument panel somewhere between the left end of the instrument panel and 12 inches (300 mm) past the vehicle centerline.
The DLC is located out of the sight of vehicle passengers, but should be easily viewable by a technician from a kneeling position outside the vehicle. The DLC is rectangular in design, capable of accommodating up to 16 terminals and has keying features to allow for easy connection. The DCL and Scan Tool connector have latching features that ensure the Scan Tool connector will remain mated when properly connected. Some common uses of the Scan Tool are:
To identify and clear any stored diagnostic trouble codes
To read the serial data stream information (e.g., PID data)
To perform Enhanced Diagnostic Tests (bi-directional Scan Tool)
The data link connector is a dedicated diagnostic scan tool connector. It is located in the engine compartment against the fire wall. It links the engine controller to the Diagnostic Readout Box (DRBII) scan tool or the Mopar Diagnostic System (MDS), or any other Chrysler-compatible diagnostic scan tool.
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