Acura CSX. Manual — part 507

Climate Control Unit

DTC

Description

DTC type

Page

HandsFreeLink Control Unit

DTC

Description

DTC type

Page

Immobilizer-Keyless Control Unit

DTC

Description

DTC type

Page

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 malfunction

Signal error

(see page 21-46)

B1241

Blower motor circuit malfunction

Signal error

(see page 21-47)

B2983

Recirculation control motor, linkage, door malfunction

Signal 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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＊０１

ＳＮＲ９Ａ００Ｊ０００５０６０００００ＣＡＡＴ１０

−

−

−

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
UNIT

CLIMATE
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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０２

０３

−

−

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

F CAN

B CAN

RTH

CAN H

5 V

5 V

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

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MICU Control Functions Index

System

Function

22-82

Multiplex Integrated Control System

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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