2006 ACURA CSX ignition

Climate Control UnitDTC Description DTC typePage
HandsFreeLink Control Unit DTC Description DTC typePage
Immobilizer-Keyless Control Unit DTC Description DTC typePage
22-79
B1200 Communication bus line error (BUS-OFF) Loss of
communication (see page 22-107)
B1202 Climate control unit internal error ( EEPROM error)Internal error (see page 21-28)
B1205 Climate control unit lost communication with the gauge control module (VSP/NE message) Loss of
communication(see page 21-28)
B1206 Climate control unit lost communication with the gauge control module (ECT message) Loss of
communication(see page 21-28)
B1207 Climate control unit lost communication with the gauge control module (ILLUMI message) Loss of
communication(see page 21-28)
B1220 Recirculation control motor circuit short Signal error (see page 21-29)
B1225 In-car temperature sensor circuit open Signal error (see page 21-31)
B1226 In-car temperature sensor circuit short Signal error (see page 21-32)
B1227 Outside air temperature sensor circuit open Signal error (see page 21-33)
B1228 Outside air temperature sensor circuit short Signal error (see page 21-34)
B1229 Sunlight sensor circuit open Signal error (see page 21-35)
B1230 Sunlight sensor circuit short Signal error (see page 21-36)
B1231 Evaporator temperature sensor circuit open Signal error (see page 21-37)
B1232 Evaporator temperature sensor circuit short Signal error (see page 21-39)
B1233 Air mix control motor circuit open Signal error (see page 21-40)
B1234 Air mix control motor circuit short Signal error (see page 21-41)
B1235 Air mix control motor stuck Signal error (see page 21-42)
B1239 Mode control motor circuit open or short Signal error (see page 21-44)
B1240 Mode control motor, linkage, door malfunctionSignal error (see page 21-46)
B1241 Blower motor circuit malfunction Signal error (see page 21-47)
B2983 Recirculation control motor, linkage, door malfunctionSignal error (see page 21-51)
B2986 Recirculation control motor circuit open Signal error (see page 21-52)
B1750 Communication bus line error (BUS-OFF) Loss of
communication (see page 22-107)
B1775 Microphone input/output short to power/open Signal error (see page 23-376)
B1776 Microphone input/output short to ground/open Signal error (see page 23-377)
B1779 HFL switch (HFL talk/HFL back buttons) circuit open/short Signal error (see page 23-379)
B1780 HFL switch (HFL talk/HFL back buttons) circuit short Signal error (see page 23-381)
B1792 HandsFreeLink control unit internal error Internal error (see page 23-382)
B1900 Communication bus line error (BUS-OFF) Loss of
communication (see page 22-108)
B1905 Immobilizer-keyless control unit lost communication with the MICU (DRLOCKSW message) Loss of
communication(see page 22-317)
B1906 Immobilizer-keyless control unit lost communication with the gauge control module (A/T message) Loss of
communication(see page 22-318)
B1925 Ignition key switch signal error Signal error (see page 22-319)
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DYNOMITE -2009-

Wake-up and Sleep Function
Fail-safe Function
Hardware Fail-safe Control
Software Fail-safe Control
Fail-safe function
22-84Multiplex Integrated Control System
System Description (cont’d)
The multiplex integrated control system has wake-up and sleep functions to decrease parasitic draw on the battery
when the ignition switch in LOCK (0).
 In the sleep mode, the MICU stops functioning (communication and CPU control) when it is not necessary for the system to operate.
 As soon as any operation is requested (for example, a door is unlocked), the related control unit in the sleep mode
immediately wakes up and begins to function.
 When the ignition switch is turned to LOCK (0), and the driver’s door is opened, then closed, there is a delay of about 40 seconds before the control unit goes from the wake-up mode to the sleep mode.
 The sleep mode will not function if any door is opened or if a key is in the ignition.
 The draw is reduced from 200 mA to less than 35 mA when in the sleep mode.
NOTE: Sleep and Wake-up Mode Test (see page 22-99).
To prevent improper operation, the MICU has a fail-safe function. In the fail-safe mode, the output signal is fixed when
any part of the system malfunctions (for example, a faulty control unit or communication line).
Each control unit has a hardware fail-safe function that fixes the output signal when there is a CPU malfunction, and a
software fail-safe function that ignores the signal from a malfunctioning control unit , which allows the system to
operate normally.
When a CPU problem or a abnormal power supply voltage is detected, the MICU moves to the hardware fail-safe
mode, and each system output load is set to the pre-programmed fail-safe value.
When any of the data from the B-CAN circuit cannot be received within a specified time, or an unusual combination of
the data is recognized, the MICU moves to the software fail-safe mode. The data that cannot be received is forced to a
pre-programmed value.
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DYNOMITE -2009-

Power Supply Voltage Monitoring Function
Entry Lights Control System
Lighting System (Headlights, Parking Lights, Fog Lights, Side Marker Lights, License Plate
Lights, and Taillights)
Daytime Running Lights
Turn Signal/Hazard Warning Lights
Door Lock Response Operation
Power Window Key-off Operation
InputOutput
Input Output
Input Output
Input Output
Input Output
Input Output
Input Output
22-85
The MICU monitors the power supply voltage (back-up voltage). If the voltage goes below 10 V, the MICU sends a MICU message and will not
store DTCs.
MICU Battery voltage MICU : MICU internal circuit
The MICU controls the ceiling light ON/OFF and dimming based upon input signals from each switch. MICU IG1 power supply Ignition key switch
Driver’s door switch
Front passenger’s door switch
Left rear door switch
Right rear door switch
Driver’s door lock knob switch (LOCK) Interior light
B-CAN Keyless LOCK signal
The MICU contains the relay circuits for the headlight high/low beams and taillights, and controls the lighting system ON/OFF based upon input
signals from the combination light switch. MICU Headlight OFF switch Headlight ON switch
Fog light switch
Dimmer switch
Combination light switch (parking lights, side marker lights,
license plate lights, and taillights)
Passing switch Headlights (low beam)
Headlights (high beam)
Parking lights
Fog lights
Side marker lights
License plate lights
Taillights
The MICU controls the exterior lights as a daytime running lights based upon input signals from each switch. MICU Headlight OFF switch Headlight ON switch
Dimmer switch
Combination light switch (parking lights, side marker lights,
license plate lights, and taillights)
Passing switch Headlights (low beam)
Headlights (high beam)
Parking lights
Slide marker lights
License plate lights
Taillights
B-CAN Transmission range switch (P position)
The MICU controls the turn signal/hazard warning lights based upon input signals from the turn signal and hazard warning switches. MICU IG1 power supply Turn signal switch (left/right)
Hazard warning switch Turn signal lights (left/right)
The MICU controls the door lock actuators based upon B-CAN signals. B-CAN Door lock signals Door lock actuator (LOCK/UNLOCK) Driver’s door lock actuator (UNLOCK)
Trunk lid release actuator
The MICU controls the power windows key-off operation based upon input signals from each switch. MICU IG1 power supply Ignition key switch
Driver’s door switch
Front passenger’s door switch Power window key-off timer
(cont’d)
08/08/21 14:24:09 61SNR030_220_0087
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DYNOMITE -2009-

Power Door Locks (Vehicle Speed Sense)
Power Door Locks (Normally LOCK/UNLOCK Operation)
Keyless Entry System
Keyless PANIC
InputOutput
Input Output
Input Output
Input Output
22-86Multiplex Integrated Control System
System Description (cont’d)
The MICU controls the door lock actuators based upon B-CAN signals and input signals from each switch.
MICU IG1 power supply Driver’s door switch
Front passenger’s door switch
Left rear door switch
Right rear door switch
Trunk lid latch switch
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)
Transmission range switch (P position) Door lock (LOCK)
B-CAN Vehicle speed pulse Engine RPM
The MICU controls the door lock actuators based upon input signals from each switch. MICU IG1 power supply Ignition key 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 lock knob switch (LOCK)
Driver’s door lock switch (LOCK/UNLOCK)
Driver’s door key cylinder switch (UNLOCK)
Front passenger’s door lock switch (LOCK/UNLOCK) Door lock actuators (LOCK/UNLOCK)
The MICU controls the door lock actuators based upon B-CAN signals and input signals from each switch. MICU IG1 power supply Ignition key 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 lock knob switch (LOCK/UNLOCK)
Driver’s door lock switch (LOCK/UNLOCK)
Driver’s door key cylinder switch (UNLOCK)
Front passenger’s door lock switch (LOCK/UNLOCK)
Transmission range switch (P position) Door lock actuator (LOCK/UNLOCK)
Driver’s door lock actuator (UNLOCK)
Trunk lid release actuator
B-CAN Keyless LOCK signal
The MICU controls the keyless PANIC based upon B-CAN signals. B-CAN Keyless PANIC signal (action, headlight low, parking light and horn) Headlights (low beam)
Parking lights
Side marker lights
License plate lights
Taillights
Horn
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DYNOMITE -2009-

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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DYNOMITE -2009-

System MenuData List Data List Indication
22-89
LightingDriver’s Door Switch OFF/ON
Hazard Switch OFF/ON
Headlight Switch (OFF) OFF/ON
Headlight Switch (PARKING) OFF/ON
Headlight Switch (HEADLIGHT) OFF/ON
Headlight Switch (High Beam) OFF/ON
Headlight Switch (PASSING) OFF/ON
Turn Signal Switch (LEFT) OFF/ON
Turn Signal Switch (RIGHT) OFF/ON
Fog Light Switch OFF/ON
Ignition Key Cylinder Light Command OFF/ON
Interior Light Command OFF/ON
Left Turn Signal Command OFF/ON
Right Turn Signal Command OFF/ON
Headlight Command OFF/ON
Headlight High Beam Command OFF/ON
Parking Light Command OFF/ON
Fog Light Command OFF/ON
DRL Command OFF/ON
Door Locks 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
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
Driver’s Door Key Cylinder Switch (LOCK) OFF/ON
Driver’s Door Key Cylinder Switch (UNLOCK) OFF/ON
Driver’s Door Lock Switch (LOCK) OFF/ON
Driver’s Door Lock Switch (UNLOCK) OFF/ON
Driver’s Door Lock Knob Switch (LOCK) OFF/ON
Driver’s Door Lock Knob Switch (UNLOCK) OFF/ON
Door LOCK Command OFF/ON
Door UNLOCK Command OFF/ON
Driver’s Door UNLOCK Command OFF/ON
(cont’d)
08/08/21 14:24:58 61SNR030_220_0091
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DYNOMITE -2009-

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)
08/08/21 14:24:58 61SNR030_220_0093
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DYNOMITE -2009-


(#')
µ
µ
µ
µ
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?
08/08/21 14:24:59 61SNR030_220_0095
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DYNOMITE -2009-