Honda CIVIC 10G 2016 Can Communications Page 1

Network Communications System Description
CAN (Controller Area Network) and the LIN (Local Interconnect Network)
The vehicle uses the CAN (Controller Area Network) and the LIN (Local Interconnect Network) as the in-vehicle LAN (Local Area
Network). These networks enable the control units to exchange the information over the CAN bus.
The CAN consists of the F-CAN network that enables the control units to exchange the signals regarding the power train/chassis and
the B-CAN network for the signals regarding the body. These networks are inter connected at the gauge control module (gateway).
The LIN is used for connecting the power window master switch, front passenger's power window switch
*1
, passenger's power
window switch
*2
, and the moonroof motor-control unit as well as for connecting the body control module and windshield wiper control
unit/motor ensuring a reliable communication suitable for the control system.
*1: 4/5-door
*2: 2-door
A
s a multi-communication system between several control units, the system also provides the K-LINE and L-LINE for transmitting the
diagnostic results from the HDS (Honda Diagnostic System) and the S-NET for transmitting the immobilizer signals.
Without Multipurpose Camera Unit
N
etwork Communications System Description 9577 http://techinfo.honda.com/rjanisis/pubs/sm/1/2/Contents/enu/61TBAD/...
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Contents Summary of Can Communications

  • Page 1Network Communications System Description CAN (Controller Area Network) and the LIN (Local Interconnect Network) The vehicle uses the CAN (Controller Area Network) and the LIN (Local Interconnect Network) as the in-vehicle LAN (Local Area Network). These networks enable the control units to exchange
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  • Page 3cardiagn.com CAN The CAN (controller area network) is a multi communication system that ISO has developed and standardized for the automobile. The CAN employs a multi-master system in which multiple control units connected to a bus communicate with each other. Communicating Method
  • Page 4In the CAN, each node normally sends the digital signals in the data frame format to the bus line. There are two communication methods between each control unit within the CAN. The first method sends the digital signal at a predetermined frequency and the second method sends the digital signal when
  • Page 5B-CAN The network between control units for body electrical system is called B-CAN and it employs low speed CAN with communication rate at 125 kbps. Connection of each control unit has control units with a terminating resistor installed for preventing signals from being reflected back at each end of
  • Page 6Power Saving Mode The body electrical system has control units which does not stop operating even if the vehicle is turned to the OFF (LOCK) mode in order to perform door lock and light control. These control units have a power saving mode to reduce the stand by power requirement. Network Communicat
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  • Page 8Communication Systems Circuit Diagram cardiagn.com
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  • Page 10Communication Systems Circuit Diagram cardiagn.com
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  • Page 12Communication Systems Circuit Diagram cardiagn.com
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  • Page 14Communication Systems Circuit Diagram cardiagn.com
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  • Page 16Communication Systems Circuit Diagram cardiagn.com
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  • Page 18Communication Systems Circuit Diagram cardiagn.com
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  • Page 20Communication Systems Circuit Diagram cardiagn.com
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  • Page 22Communication Systems Circuit Diagram cardiagn.com
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  • Page 24Communication Systems DTC Troubleshooting Index DTC Troubleshooting Index DTC Two Drive Cycle Detection Item MIL Detection U0029-00 ――― CAN Gateway F-CAN ch A Bus Off ――― U0047-00 ――― CAN Gateway F-CAN ch B Bus Off ――― U3000-49 ――― CAN Gateway Internal Failure ――― U3000-51 ――― CAN Gateway Programmin
  • Page 25Communication Systems DTC Troubleshooting Index DTC Troubleshooting Index DTC Two Drive Cycle Detection Item MIL Detection U0029-00 ――― CAN Gateway F-CAN ch A Bus Off ――― U0047-00 ――― CAN Gateway F-CAN ch B Bus Off ――― U3000-49 ――― CAN Gateway Internal Failure ――― U3000-51 ――― CAN Gateway Programmin
  • Page 26Multiplex Integrated Control System Description - Control/Function Overview The body control module is one of the F-CAN and the B-CAN components. The body control module controls many systems related to the body controller area and security system, and also works as a gateway to diagnose the other B
  • Page 27Multiplex Integrated Control System Description - Failsafe Function Hardware Failsafe Control When a CPU problem or an abnormal power supply voltage is detected, the body control module moves to the hardware failsafe mode, and each system output load is set to the pre-programmed failsafe value. Soft
  • Page 28Multiplex Integrated Control System Sleep and Wake-Up Mode Test 1. Shift to the sleep mode: Close all doors. Turn the vehicle to the OFF (LOCK) mode, then open and close the driver's door. If the body control module receives no signals from the inputs listed below, it will go into sleep mode in less
  • Page 29IG1 power supply IG2 power supply ACC power supply B-CAN data F-CAN data Driver's door lock switch (LOCK/UNLOCK) Front passenger's*1/passenger's*2 door lock switch (LOCK/UNLOCK) Driver's door switch (door open) Front passenger's*1/passenger's*2 door switch (door open) Left rear door switch (door ope
  • Page 30Multiplex Integrated Control System Sleep and Wake-Up Mode Test 1. Shift to the sleep mode: Close all doors and tailgate. Turn the vehicle to the OFF (LOCK) mode, then open and close the driver's door. If the body control module receives no signals from the inputs listed below, it will go into sleep
  • Page 31IG1 power supply IG2 power supply ACC power supply B-CAN data F-CAN data Driver's door lock switch (LOCK/UNLOCK) Front passenger's door lock switch (LOCK/UNLOCK) Driver's door switch (door open) Front passenger's door switch (door open) Left rear door switch (door open) Right rear door switch (door
  • Page 32Road Departure Mitigation Circuit Diagram Without keyless access system cardiagn.com Without keyless access system
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  • Page 36Road Departure Mitigation Circuit Diagram cardiagn.com
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  • Page 38Road Departure Mitigation Circuit Diagram Without keyless access system cardiagn.com Without keyless access system
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  • Page 42Road Departure Mitigation Component Location Index cardiagn.com
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  • Page 44Road Departure Mitigation Component Location Index cardiagn.com M/T
  • Page 45CVT cardiagn.com
  • Page 46Road Departure Mitigation Symptom Troubleshooting - RDM indicator (on the MID) does not come on cardiagn.com RDM indicator (on the MID) does not come on 1. Gauge control module operation check: ‐1. Turn the vehicle to the ON mode. ‐2. Check the following indicators in the gauge control module: Malfu
  • Page 47‐2. Turn the vehicle to the ON mode. ‐3. Measure the voltage between test points 1 and 2. Test condition Vehicle ON mode Gauge control module connector A (32P): disconnected Test point 1 Gauge control module connector A (32P) No. 17 Test point 2 Body ground Is there battery voltage? YES Replace the
  • Page 48Road Departure Mitigation Symptom Troubleshooting - RDM indicator (on the MID) does not go off cardiagn.com
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  • Page 50RDM indicator (on the MID) does not go off 1. DTCs check: ‐1. Check for DTCs with the HDS. DTC Description DTC Are any DTCs indicated? YES Go to the indicated DTC's troubleshooting.■ NO Go to step 2. 2. CAN gateway system DTC check: ‐1. Turn the vehicle to the ON mode. ‐2. Check for DTCs with the HD
  • Page 51Fuse No. B5 (10 A) Location Under-dash fuse/relay box Is the fuse OK? YES The fuse is OK. Reinstall the fuse, then go to step 5. NO 2/4-door: Replace the fuse. Turn the vehicle to the ON mode, then the OFF (LOCK) mode. If the fuse blows again, repair the short to ground on the No. B17 (5 A)*1, No. B
  • Page 52‐2. Check for continuity between test points 1 and 2. 2/4-door: Test condition Vehicle OFF (LOCK) mode Multipurpose camera unit 20P connector: disconnected Test point 1 Multipurpose camera unit 20P connector No. 14 Test point 2 Body ground 5-door: Test condition Vehicle OFF (LOCK) mode Millimeter wa
  • Page 53Gauge control module connector A (32P): disconnected Test point 1 CAN gateway 12P connector (female terminals) No. 3: Test point 2 Gauge control module connector A (32P) No. 19 Test point 1 CAN gateway 12P connector (female terminals) No. 9: Test point 2 Gauge control module connector A (32P) No. 20
  • Page 54Is there continuity? YES Check for loose terminals and poor connections in the multipurpose camera unit 20P connector (2/4-door) or millimeter wave radar 8P connector (5-door). Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, repla
  • Page 55Road Departure Mitigation System Description - Overview The Road Departure Mitigation (RDM) System uses image information from the multipurpose camera to recognize the lane markings on the road. The multipurpose camera unit monitors the lane markings and detects risks of the vehicle moving out of it
  • Page 56System The Road Departure Mitigation (RDM) System works as long as an approaching lane marking Operation is recognizable (lane markings may not be recognizable under some conditions such as bad Conditions weather, backlit, and on snowy roads). Operation vehicle 45 - 90 mph (72 - 145 km/h) speed Obje
  • Page 57Road Departure Mitigation System Description - System Diagram The system diagram of the RDM system is shown below. For locations of each component on vehicle, refer to Component Location Index: EPS motor/control unit Gauge control module Multipurpose camera unit PCM SRS unit VSA modulator-control un
  • Page 58Originating Unit Signal Name Vehicle speed signal cardiagn.com
  • Page 59Originating Unit Signal Name SRS unit Yaw rate sensor signal Yaw rate sensor failure information VSA modulator-control unit Master cylinder pressure signal VSA system actuation information VSA system failure information Wheel speed sensor signals Multipurpose Camera Unit Transmitting Signal: Destina
  • Page 60Road Departure Mitigation System Description - System Diagram The system diagram of the RDM system is shown below. For locations of each component on vehicle, refer to Component Location Index: EPS motor/control unit Gauge control module Millimeter wave radar Multipurpose camera unit PCM SRS unit VS
  • Page 61Originating Unit Signal Name Gauge control module Customization signal Gauge control module failure information Turn signal lights operating status Wiper operating status PCM Accelerator pedal position (APP) sensor signal Brake pedal position switch signal PCM failure information Vehicle speed signa
  • Page 62CAN Gateway Removal and Installation 1. Driver's Dashboard Lower Cover - Remove 2. CAN Gateway - Remove 1. Disconnect the connector (A). 2. Remove the CAN gateway (B). cardiagn.com 3. All Removed Parts - Install 1. Install the parts in the reverse order of removal. 4. CAN Gateway - Update NOTE: When
  • Page 63CAN Gateway Update Special Tool Required Image Description/Tool Number MVCI unit with the latest control module (CM) update software installed cardiagn.com 1. CAN Gateway - Update NOTE: Check any official service website for more information about updating the MVCI and control units.