G6 L4-2.4L (2007)
Information Bus: Description and Operation
DATA LINK COMMUNICATIONS DESCRIPTION AND OPERATION
CIRCUIT DESCRIPTION
The communication among control modules is performed through the GMLAN high speed serial data circuit and the GMLAN low speed serial data
circuit. The modules that need real time communication are attached to the high speed GMLAN network. The body control module (BCM) is the
gateway between the networks. The purpose of the gateway is to translate serial data messages between the GMLAN high speed buss and the GMLAN
low speed buss. The gateway will interact with each network according to that network's transmission protocol. Refer to Body Control System
Description and Operation for more information about the gateway.
GMLAN HIGH SPEED CIRCUIT DESCRIPTION
The data link connector (DLC) allows a scan tool to communicate with the high speed GMLAN serial data circuit. The serial data is transmitted on
two twisted wires that allow speed up to 500 Kb/s. The twisted pair is terminated with two 120 ohms resistors, one is internal to the powertrain
control module (PCM) or engine control module (ECM) depending on regular production option (RPO) and the other is internal to the body control
module (BCM). The BCM is considered the DLC termination point of the link and the engine management controller is the other end of the link. The
resistors are used to reduce noise on the High Speed GMLAN buss during normal vehicle operation. The high speed GMLAN is a differential bus.
The high speed GMLAN serial data bus (+) and high speed GMLAN serial data (-) are driven to opposite extremes from a rest or idle level. The idle
level, which is approximately 2.5 volts, is considered recessive transmitted data and is interpreted as a logic 1. Driving the lines to their extremes,
adds one volt to the high speed GMLAN serial data bus (+) and subtracts one volt from the high speed GMLAN serial data bus (-) wire. This
dominant state is interpreted as a logic 0. GMLAN network management supports selective start up and is based on virtual networks. A virtual
network is a collection of signals started in response to a vehicle event. The starting of a virtual network signifies that a particular aspect of the
vehicles functionality has been requested. A virtual network is supported by virtual devices, which represents a collection of signals owned by a single
physical device. So, any physical device can have one or more virtual devices. The signal supervision is the process of determining whether an
expected signal is being received or not. Failsofting is the ability to substitute a signal with a default value or a default algorithm, in the absence of a
valid signal. Some messages are also interpreted as a heartbeat of a virtual device. If such a signal is lost, the application will set a no communication
code against the respective virtual device. This code is mapped on the Tech 2 screen as a code against the physical device.
NOTE: a loss of serial data DTC does not represent a failure of the module that the code is set in.
GMLAN LOW SPEED CIRCUIT DESCRIPTION
The data link connector (DLC) allows a scan tool to communicate with the low speed GMLAN serial data circuit. The serial data is transmitted over a
single wire to the appropriate control modules. The transmission speed for GMLAN low speed is up to 83.33 Kb/s. Under normal vehicle operating
conditions, the speed of the buss is 33.33 Kb/s. This protocol produces a simple pules train sent out over the GMLAN low speed serial data bus.
When a module pulls the buss high, 5 volts, this creates a dominant logic state or 0 on the buss. When the buss is pulled low 0 volts, it is translated as
a recessive logic state or 1. To wake the control modules connected to the GMLAN low speed serial data buss, a high voltage wake up pulse is sent
out over the buss, the voltage level of the pules is +10 volts. Modules connected to the GMLAN low speed buss can be part of a virtual network as
described in the previous paragraph. The modules on the GMLAN low speed serial data buss are connected to the buss in a parallel configuration.
DATA LINK CONNECTOR (DLC)
The data link connector (DLC) is a standardized 16-cavity connector. Connector design and location is dictated by an industry wide standard, and is
required to provide the following:
-
Pin 1 GMLAN low speed communications terminal
-
Pin 4 Scan tool power ground terminal
-
Pin 5 Common signal ground terminal
-
Pin 6 High speed GMLAN serial data bus (+) terminal
-
Pin 14 High speed GMLAN serial data bus (-) terminal
-
Pin 16 Scan tool power, battery positive voltage terminal
SERIAL DATA REFERENCE
The scan tool communicates over the various busses on the vehicle. When a scan tool is installed on a vehicle, the scan tool will try to communicate
with every module that could be optioned into the vehicle. If an option is not installed on the vehicle, the scan tool will display No Comm for that
options control module. In order to avert misdiagnoses of No Communication with a specific module, refer to Data Link References for a list of
modules, the busses they communicate with, and the RPO codes for a specific module.
