ECU ACURA CSX 2006 Service Repair Manual

Loss of Communication DTC cross-reference chart
BUS OFF and Internal Error CodesDTC type Related Unit MICU Gauge ControlModuleClimate Control
Unit HandsFreeLink
Control Unit Immobilizer-
Keyless Control Unit
Transmitting Control Unit Message Receiving Unit/Loss of Communication DTC
MICU Gauge ControlModuleClimate Control
Unit Immobilizer-
Keyless Control Unit
22-76Multiplex Integrated Control System
General Troubleshooting Information (cont’d)
When an ECU on the CAN circuit is unable to communicate with other ECUs on the CAN circuit, one or more of the
control units will set a loss of communications DTC. Use this chart to find the control unit that is not communicating.
1. Find the Transmitting Control Unit that is in the same row as all of the loss of communication DTCs retrieved.
2. Do the input test for the transmitting control unit.
BUS OFF B1000 B1150 B1200 B1750 B1900
ECU (CPU) Error B1001
ECU (EEPROM)
Error B1002 B1152 B1202
ECU (Internal)
Error B1792
MICU RM B1188 HLSW B1155
WIPSW B1156 MICU B1157
DOORSW B1159
DRLOCKSW B1160 B1905
Gauge Control
Module VSP/NE B1011 B1205
A/T B1008 B1906
CDS (SRS) B1032 ECT B1206
ECM/PCM ENG B1168 A/T B1169
ABS or VSA
modulator-
control unit ABS or VSA B1170
TPMS Control
unit TPMS B1173
EPS Control unit EPS B1183
SRS SRS B1187
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Body Controller Area Network (B-CAN) and Fast Controller Area Network (F-CAN)
22-80 Multiplex Integrated Control System
System Description
GAUGE CONTROL MODULE (TACH)
CAN H CAN L
MICU
ECM/PCM
(F-CAN)
(B-CAN)UNDER-DASH FUSE/RELAY BOX
DATA LINK CONNECTOR
SRS UNIT
ABS MODULATOR-CONTROL UNIT*1
VSA MODULATOR-CONTROL UNIT*2
YAW RATE-LATERAL
ACCELERATION SENSOR*2
EPS CONTROL UNIT
TPMS CONTROL UNIT*3






 F-CAN
TRANSCEIVER
B-CAN
TRANSCEIVER
IMMOBILIZER-
KEYLESS CONTROL
UNITCLIMATE
CONTROL
UNIT
HANDSFREELINK
CONTROL UNIT*4
*1: ’06 07 Touring and Premium models
*2: ’07 TYPE S and ’08 09 models
*3: ’08 09 models
*4: ’09 model with navigation system
The body controller area network (B-CAN) and the fast controller area network (F-CAN) share information between
multiple electronic control units (ECUs). B-CAN communication moves at a slower speed (33.33 kbps) for convenience
related items and for other functions. F-CAN information moves at a faster speed (500 kbps) for ‘‘real time’’ functions
such as fuel and emissions data. To allow both systems to share information, the gauge control module translates
information from B-CAN to F-CAN and from F-CAN to B-CAN.
 The single wire method is used between the units not requiring the communication to move at a fast speed.
 Using a single wire method reduces the number of the wires used on the body controller area network.
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Gateway Function
Network ‘‘Loss of Communication’’ Error Checking Function
Except TYPE S Error Code List
Error code Type of communication line(s) error
TYPE S Error Code List Error code Type of communication line(s) error
22-81
(GATE WAY)CPU BAT
GND
FCAN BCAN
RTH
CAN H
5V
5V
CAN L
CAN H
CAN L
CAN H
Example: Error 1
The gauge control module acts as a gateway to allow both systems to share information, the gauge control module
translates information from B-CAN to F-CAN and from F-CAN to B-CAN.
The ECUs on the CAN circuit send messages to each other. If there is any malfunction on the network, the odo/trip
display on the gauge control module can indicate the error messages by entering the gauge self-diagnostic function
(see page 22-241).
 Error 1: There is a malfunction in the communication line between the gauge control module (tach) and the F-CAN.
 Error 2: There is a malfunction in the communication line between the gauge control module (tach) and the B-CAN.
 Error 3: There is a malfunction in the communication line between the gauge control module (tach) and the gauge control module (speedo) (UART line).
Error 1 F-CAN communication
Error 2 B-CAN communication
Error 3 UART communication
Error 12 F-CAN and B-CAN communication
Error 13 F-CAN and UART communication
Error 23 B-CAN and UART communication
Error 123 F-CAN, B-CAN and UART communication
Error 1 F-CAN communication
Error 2 B-CAN communication
Error 12 F-CAN and B-CAN communication
(cont’d)
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MICU Control Functions Index
SystemFunction
22-82Multiplex Integrated Control System
System Description (cont’d)
The MICU (built into the under-dash fuse/relay box) is one of the B-CAN components. The MICU controls many
systems related to the body controller area and security system, and also works as a gateway to the diagnose the
other B-CAN connected ECUs with the HDS.
Refer to the each system circuit diagram in detail.
Multiplex Control Sends the switch input signal information to the MICU and outputs the information. The MICU controls the ECUs electric load and communication based upon the information
received the B-CAN.
On-Board Diagnosis The MICU has a gateway function which sends the results of the MICU internal diagnosis and the B-CAN connected ECUs diagnosis to the HDS.
Self-Diagnosis Test mode 1 diagnoses the communication line between the MICU and B-CAN connected unit. Test mode 2 checks the switch inputs connected to the MICU.
Interior Light(s) The MICU controls the interior lights ON, OFF and dimming based upon the information of the related switches and/or the B-CAN related information.
Sleep Function The MICU has a sleep function, which it enters during the power down mode.
The MICU also controls the function of these circuits:  Entry lights control (map lights and ceiling light)
 Exterior lights control (including the daytime running lights control)
Horn
 Interlock system
 Key-in reminder
 Keyless entry
 Lights-on reminder
 Power door locks
 Power window key-off timer
 Seat belt reminder
 Security alarm
 Turn signal/hazard flasher
 Wiper/washer
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Self-diagnostic Function
22-83
GAUGE CONTROL MODULE
CAN H CAN L B-CAN
B-CAN (33.33 kbps)
F-CAN (500 kbps)
SRS UNIT MICU
ECM/PCM
ABS MODULATOR-
CONTROL UNIT* IMMOBILIZER-
KEYLESS
CONTROL UNIT
K-LINE
DATA LINK
CONNECTOR HDS CLIMATE CONTROL
UNIT
TMPS CONTROL
UNIT* EPS CONTROL
UNIT
NAVIGATION
UNIT
VSA MODULATOR-
CONTROL UNIT*
HANDSFREELINK
CONTROL UNIT*
AUDIO UNIT
YAWRATE-LATERAL
ACCELERATION
SENSOR*
*1: ’06-08 Touring and Premium models
*2: ’07 TYPES and ’08-09 models
*3: ’08-09 models
*4: ’09 model with navigation system
1
3 2
4
2
By connecting the HDS to the data link connector (DLC), the HDS can retrieve the diagnostic results from the MICU via
a diagnostic line called K-LINE. The K-LINE is distinguished from the CAN line, and connected to the CAN related ECUs.
The MICU is a gateway between the HDS and B-CAN related ECUs, and sends B-CAN diagnostic results to the HDS.
When doing a function test with the HDS, the HDS sends an output signal through the K-LINE to the MICU. The MICU
either relays the request to another ECU, or commands the function its self.
(cont’d)
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Security Alarm System
Key-in Reminder
Key Interlock (A/T)
Answer Back Response Operation
Wiper/Washer
Collision Detection Signal (CDS)
InputOutput
Input Output
Input Output
Input Output
Input Output
Input Output
22-87
The MICU controls the lighting system and horn based upon B-CAN signals and input signals from the each switch.
MICU IG1 power supply Ignition key switch
Audio switch
Driver’s door switch
Front passenger’s door switch
Left rear door switch
Right rear door switch
Trunk lid latch switch
Driver’s door key cylinder switch (UNLOCK)
Driver’s door lock knob switch (UNLOCK)
Front passenger’s door lock knob switch (UNLOCK)
Left rear door lock knob switch (UNLOCK)
Right rear door lock knob switch (UNLOCK)
Hood switch Horn
Headlights
Parking lights
Side marker lights
License plate lights
Taillights
B-CAN Keyless LOCK signal Door lock signal
The MICU controls the door lock actuators based upon ignition key switch, the driver’s door switch, and driver’s door lock knob switch signals. MICU Ignition key switch Driver’s door switch
Driver’s door lock knob switch Door lock actuator (LOCK/UNLOCK)
Driver’s door lock actuator (UNLOCK)
The MICU controls the key interlock solenoid based upon IG1, transmission range switch, and park-pin switch signals. MICU Ignition switch ACC Transmission range switch (P position)
Park-pin switch Key interlock solenoid
The MICU controls the lighting system and horn based upon B-CAN signals. B-CAN Answer back signals (headlight low, horn, parking lights) Horn Headlights
Parking lights
Side marker lights
License plate lights
Taillights
The MICU controls the wiper motor and the washer motor based upon IG1 and wiper/washer switch signals. MICU IG1 power supply Wiperswitch(INTandLO)
Wiper switch (LO and HI)
Wiper switch (MIST)
Washer switch
Wiper intermittent speed Wiper motor
Washer motor
The MICU controls the door lock actuators based upon IG1 and B-CAN signals. MICU IG1 power supply Door lock (LOCK/UNLOCK)
B-CAN SRS signal (front, side and rear) Impact sensors
(cont’d)
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HDS Inputs and Commands
Input:System Menu Data List Data List Indication
22-88Multiplex Integrated Control System
System Description (cont’d)
Certain inputs happen so quickly that the HDS cannot update fast enough. Hold the switch that is being tested while monitoring the Data List.
This should give the HDS time to update the signal on the Data List.
Because the HDS software is updated to support the release for newer vehicles it is not uncommon to see system function tests that are not
supported.
Make sure that the most current software is loaded.
Gauges Cruise Control Main Switch OFF/ON Cruise Control Set Switch OFF/ON
Cruise Control Resume Switch OFF/ON
Washer Fluid Level Switch OFF/ON
VSA/TCS Off Switch OFF/ON
Gauge Select/Reset Switch OFF/ON
Parking Brake Switch OFF/ON
Brake Fluid Level Switch OFF/ON
Illumination Volume Plus Switch OFF/ON
Illumination Volume Minus Switch OFF/ON
Km/h mph Select Switch OFF/ON
Fuel Sending Unit Input 1 deg
Fuel Sending Unit Input 2 VOLTAGE
VSA/TCS Active Indicator OFF/ON
VSA/TCS Indicator (Warning) OFF/ON
ABS Indicator OFF/ON
Cruise Control Main Switch Indicator OFF/ON
MIL Indicator OFF/ON
Washer Fluid Level Indicator OFF/ON
DRL Indicator OFF/ON
Low Oil Pressure Indicator OFF/ON
Charging System Indicator OFF/ON
Cruise Main Switch ON Indicator OFF/ON
Maintenance Minder Indicator OFF/ON
High Beam Indicator OFF/ON
Parking Light ON Indicator OFF/ON
Low Fuel Warning Indicator OFF/ON
Security Indicator OFF/ON
Fog Light Indicator OFF/ON
Seat Belt Indicator OFF/ON
Speed Indicator (km/h) 0 249 km/h, over 250 km/h, Fail
Speed Indicator (mph) 0 154 mph, over 155 mph, Fail
Low Tire Pressure Indicator OFF/ON
TPMS Indicator OFF/ON
A/TGearPositionSwitch(R) OFF/ON
A/TGearPositionSwitch(P) OFF/ON
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System MenuData List Data List Indication
22-91
SecurityIgnition Key Cylinder Switch OFF/ON
Driver’s Door Switch OFF/ON
Front Passenger’s Door Switch OFF/ON
Driver’s Rear Door Switch OFF/ON
Passenger’s Rear Door Switch OFF/ON
Trunk Lid/Tailgate Switch OFF/ON
Front Passenger’s Door Lock Sw. (LOCK) OFF/ON
Front Passenger’s Door Lock Sw. (UNLOCK) OFF/ON
Front Passenger’s Door Lock Knob Sw. (UNLOCK) OFF/ON
Driver’s Rear Door Lock Knob Switch (UNLOCK) OFF/ON
Passenger’s Rear Door Lock Knob Sw. (UNLOCK) OFF/ON
Trunk Key Cylinder (UNLOCK) OFF/ON
Radio Switch OFF/ON
Hazard Switch OFF/ON
Hood Switch OFF/ON
Driver’s Door Key Cylinder Switch (LOCK) OFF/ON
Driver’s Door Key Cylinder Switch (UNLOCK) OFF/ON
Driver’s Door Look Switch (LOCK) OFF/ON
Driver’s Door Look Switch (UNLOCK) OFF/ON
Driver’s Door Look Knob Switch (LOCK) OFF/ON
Driver’s Door Look Knob Switch (UNLOCK) OFF/ON
Door LOCK Command OFF/ON
Door UNLOCK Command OFF/ON
Driver’s Door UNLOCK Command OFF/ON
Security Hazard Signal Command OFF/ON
Headlight Command OFF/ON
Headlight High Beam Command OFF/ON
Parking Light Command OFF/ON
(cont’d)
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•••
Function Test:
System Menu Data List Indication Data List and Operation Time
22-92Multiplex Integrated Control System
System Description (cont’d)
Door Locks
LOCK all doors Outputs LOCK signal 1 time (0.6 sec) to all doors
UNLOCK driver’s side door Outputs UNLOCK signal 1 time (0.6 sec) to driver’s
door
UNLOCK all doors Outputs UNLOCK signal 1 time (0.6 sec) to all doors
Lighting Interior Light Command Illuminates for 30 seconds.
LEFT Turn Signal Command Blinks for 5 seconds.
RIGHT Turn Signal Command Blinks for 5 seconds.
Hazard flasher Blinks turn signal (left and right) for 15 seconds.
Headlight Command Operates headlight (low) for 15 seconds.
Headlight HIGH Beam Command Operates headlight (high) for 15 seconds.
Fog Light Operates fog light relay for 15 seconds.
Parking Light Command Operates small lights for 15 seconds.
Keyless Trunk Lid/Tailgate Release Command Unlock trunk
Security Horn Command Operates horn for 1 second.
Wipers Windshield Wiper Motor LOW Command Operates windshield wiper motor for 5 seconds (low
speed).
Windshield Wiper Motor HIGH Command Operates windshield wiper motor for 5 seconds (high
speed).
Windshield Washer Command Operates windshield washer motor for 5 seconds.
Gauges Self Diagnostic Test
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YES
NO
YES
NO
22-93
Troubleshooting - B-CAN System Diagnosis Test Mode A
A
Check the ECM/PCM for DTCs and troubleshoot ECM/
PCM (see page 11-3) or F-CAN loss of communication
errors first, then do this diagnosis if the symptom is
relatedtotheB-CANsystem.
NOTE: If the HDS is not available, do the Test Mode 1 and Test Mode 2 (see page 22-97).
 Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting
procedures.
1. Compare the symptom with this list of B-CAN related systems:
 Gauge control module
 Exterior lights
 Turn signals
 Entry light control
 Interior lights
 Door-open and trunk-open indicators
 Horns (security and panic)
 Chimes (key-in, seat belt, lights-on, and parking brake)
 Power window/moonroof timer
 Wiper/washer
Security
 Keyless entry
 Power door locks
Keyinterlock
 Dash light brightness control
Go to step 2.
Go to the system troubleshooting for the
system with the symptom. 2. Connect the HDS to the data link connector (A),
then turn the ignition switch to ON (II).
3. From the BODY ELECTRICAL menu, select UNIT INFORMATION, and then select CONNECTED UNIT
listed to see if the following control units are
communicating with the HDS.
MICU
 Gauge control module
 Immobilizer-keyless control unit
 Climate control unit
 HandsFreeLink control unit
NOTE:  If one or more of the units are not communicating with the HDS, DETECT will be
displayed.
 If the unit is not communicating or the vehicle is not equipped, ‘‘Not Available’’ will be displayed.
Go to step 4.
If any of the control units are not
communicating, go to B-CAN System Diagnosis
Test Mode B (see page 22-94). If all units are not
communicating or only the MICU is communicating,
go to DTC B1000 troubleshooting (see page 22-102).
(cont’d)
Is the symptom related to the B-CAN system? Ar e al l cont r ol uni t s communi cat i ng w i t h t he H DS?
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