Question about Land Rover Cars & Trucks
I am using SDD to troubleshoot a CAN communication issue and the steps it is suggesting involve the BCM module.....It says to check BCM module 2 and 5.....Any ideas? Update: the DTC I,m getting is U0140.....which is a communications issue and SDD is directing me to the CJB....thanks for any help that could be given..... Update, I checked the workshop manual and found that the BCM is also the Central Junction Box (CJB) in the vehicle.....Now the question is where are module 2 and 5 that SDD refers to? Don Hicks
Unfortunately I believe that will require a trip to the dealer, and a hefty price tag to go with it. Most dealers refuse to let anyone else handle their security systems. And most keys have the alarm keypad built in making it even more dealer specific. I wish I could give better news.
Posted on Mar 27, 2009
I have a 2005 Range Rover HSE. The Navigation, Radio & Cd stop working. I took the truck to a Range dealer. I was told. I need to change the Bluethooth module. There is a leak, it got wet. Was there any recall for the leaking problem. What is the solution. They Charge me 1300.00 to fix it.
Posted on Apr 03, 2011
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Class 2 serial data received from other control modules connected to the class 2 serial data link.
The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link. The control module capable of performing the required function will respond to the BCM message.
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.
Body Control Module (BCM)
The body control module (BCM) contains the logic of the theft deterrent system. The BCM provides the 5-volt reference to operate the Passlock?"¢ sensor. The BCM also measures the voltage of the off/run/crank voltage. The voltage measured will indicate whether the Passlock?"¢ sensor has been activated and whether the resistance value from the sensor is a valid value or the tamper value. If voltage measured is in the valid range, the BCM compares this voltage to a previously learned voltage code. If the voltage codes match, the BCM sends a serial data message containing a password to the engine control module (ECM). If the voltage codes do not match, or the voltage is in the tamper range, or there is a circuit fault, the BCM will not send the correct password to the ECM, and the vehicle will not start.
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