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What is the difference between GMLAN and CAN 500K protocol used in ford vehicles?
Wiki User
∙ 15y ago
CAN protocol comprises only of PHYSICAL and DATA LINK LAYER when mapped with the ISO/OSI standards. Higher layers specific to the application can be built over this basic layer. But this is not mandated unless required.
GMLAN on the other hand uses CAN protocol. But it also mandates the use of TRANSPORT layer, NODE MANAGEMENT layer, NETWORK MANAGEMENT layer and INTERACTION layer on top of CAN protocol. It can be mapped to the ISO/OSI model completely.
500k CAN used in Ford vehicles will definitely have higher layers equivalent to those of GMLAN. Only the structure of higher layers might differ in the two protocol. Rest the same.
Wiki User
∙ 15y ago
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How do automotive control modules communicate?
Todays GM control modules communicate in several different ways. It depends on the module and the system. Some modules are capable of communicating in more than 1 way, depending on the information needed to be shared with a particular module. The different communication circuits are- Class II, high speed GMLAN, low speed GMLAN, serial data stream.- TechJK ----------------------------------------------------
Radio wiring diagram 2007 Chevy silverado?
Here is the info in your vehicle: Radio 12v red/white + radio harness Radio Ground black - radio harness Radio Ignition (GMLAN Serial Data) Radio Illumination yellow (dimmer) + radio harness Factory Amp Turn-on same as power antenna wire Power Antenna white + radio harness LF Speaker +/- tan - gray +,- radio harness or amplifier Notes: If equipped, the amplifier is under the rear of the center console. At the amplifier, the left subwoofer wires are dk. blue/white (+) - lt. green/black (-). The right subwoofer wires are dk. green (+) - lt. blue/black (-). RF Speaker +/- lt. green - dk. green +,- radio harness or amplifier LR Speaker +/- brown - yellow +,- radio harness or amplifier RR Speaker +/- dk. blue - lt. blue +,- radio harness or amplifier
What does u0101 lost communication with tcm mean?
DTC U0100-U0299 Circuit Description Modules connected to the high speed GMLAN serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. DTC Descriptors This diagnostic procedure supports the following DTCs: DTC U0100 Lost Communication With Engine Control Module (ECM) DTC U0101 Lost Communication With Transmission Control Module (TCM) DTC U0104 Lost Communication With Distance Sensing and Cruise Control (DSCC) Module DTC U0121 Lost Communication With Electronic Brake Control Module (EBCM) DTC U0141 Lost Communication With Instrument Panel Module (IPM) DTC U0181 Lost Communication With Dynamic Headlamp Leveling (DHL) Control Module This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom DTC Symptom Descriptor 00 No Additional Information Conditions for Running the DTC Voltage supplied to the modules is in the normal operating voltage range. The vehicle power mode requires serial data communication to occur. The DTC U0001 does not have a current status. Conditions for Setting the DTC A supervised periodic message that includes the transmitter module availability has not been received. Action Taken When the DTC Sets The module uses a default value for the missing parameter. Conditions for Clearing the DTC A current DTC clears when the malfunction is no longer present. A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. Diagnostic Aids A poor connection at the inoperative module may cause this code to set. An improperly powered module may cause this code to set. Step Action Yes No Schematic Reference: Data Link Connector (DLC) Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems 1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2 Go to Diagnostic System Check - Vehicle in Vehicle DTC Information 2 Did you record any DTC in the range of U2105-U2199? Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Go to Step 3 3 Important Use the DTC list in DTC Descriptors to determine which module is not communicating. Test the following circuits of the module that is not communicating for an open or a short to ground: The battery positive voltage input circuits The battery positive voltage output circuits The ignition voltage input circuits The ignition voltage output circuits The switched battery positive voltage circuits Refer to the following: Control Module References for the applicable schematic Circuit Testing in Wiring Systems Wiring Repairs in Wiring Systems Did you find and correct the condition? Go to Step 8 Go to Step 4 4 Turn OFF the ignition. Test the ground circuits of the module that is not communicating for an open. If the module is the body control module (BCM), test its class 2 serial data circuit for an open, also. Refer to the following: Control Module References for the applicable schematic Circuit Testing in Wiring Systems Wiring Repairs in Wiring Systems Did you find and correct the condition? Go to Step 8 Go to Step 5 5 Test the high speed GMLAN serial data circuits of the module that is not communicating for an open. Refer to Circuit Testing and GMLAN Wiring Repairs in Wiring Systems. Did you find and correct the condition? Go to Step 8 Go to Step 6 6 Inspect the harness connectors of the module that is not communicating for poor connections and terminal tension at the following circuits: The battery positive voltage input circuits The battery positive voltage output circuits The ignition voltage input circuits The ignition voltage output circuits The switched battery positive voltage supply circuits The ground circuits The high speed GMLAN serial data circuits Refer to the following: Control Module References for the applicable schematic Testing for Intermittent Conditions and Poor Connections in Wiring Systems Connector Repairs in Wiring Systems Did you find and correct the condition? Go to Step 8 Go to Step 7 7 Replace the module that is not communicating. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? Go to Step 8 -- 8 Use the scan tool in order to clear the DTCs. Does the scan tool still display other current DTCs? Go to Diagnostic System Check - Vehicle in Vehicle DTC Information --
