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Acura TSX / Honda Accord CL. Manual - part 145

Fig. 14: Climate Control Unit Table

TROUBLESHOOTING

B-CAN SYSTEM DIAGNOSIS TEST MODE A

1. Make sure the system is related to B-CAN:

Gauge control module

Exterior lights

Turn signals

Entry light control

Interior lights

Safety indicators

Rear window defogger

Horns (security and panic)

Chimes (key, seatbelt and lights ON)

Power windows

Moonroof timer

Wiper/washer

Security

Keyless entry

Power door locks

Climate control

Key interlock

Dash light brightness

Is the symptom related to the B-CAN system?

YES: Go to step 2.

NOTE:

Perform this diagnosis first if the symptom is related to the B-CAN system.

Always cycle the ignition switch within 3 seconds when prompted in the
DTC troubleshooting procedures in this section.

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

NO: Go to the system troubleshooting for the system with the symptom.

2. Connect the Honda Diagnostic System (HDS).

3. From BODY ELECTRICAL MENU, select connected units UNIT INFORMATION, and then select

CONNECTED UNIT.

MICU

Door multiplex control unit

Gauge control module

Combination switch control unit

Relay control module

Climate control unit

Are all control units communicating with the HDS?

YES: Go to step 4.

NO: If any of them are not communicating, go to B-CAN System Diagnosis Test Mode B. If
all units are not communicating, go to DTC B1000 troubleshooting (see DTC B1000:
COMMUNICATION BUS LINE ERROR ).

4. Select the system that has the problem from the BODY ELECTRICAL MENU, then select DTCs.

Are any DTCs indicated?

YES: Go to step 5.

NO: If the problem is related to one the following items, go to B-CAN System Diagnosis
Test Mode C:

Exterior lights

Turn signals

Entry light control

Interior lights

Rear window defogger (climate control)

Horns (security and panic)

Power windows

Moonroof timer

Wiper/washer

Power door locks

NOTE:

If the unit is communicating with the scan tool, DETECT will be
displayed.

If the unit is not communicating, "NOT AVAILABLE" will be
displayed.

NOTE:

In the problem is related to one of the following items, go
to the troubleshooting for that individual system:

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

Gauge control module

Safety indicators

Chimes (key, seat belt and lights ON)

Security

Keyless entry

Climate control

Key interlock

Dash light brightness

Audio System

Navigation

5. Record all DTCs and sort them by DTC type using the DTC troubleshooting Index.

6. Troubleshoot the DTC(s) in the following order:

Battery voltage DTCs.

Internal error DTCs.

Loss of communicator DTCs. Begin troubleshooting with the lowest number first (Example: if
DTC B1006 and B1058 are retrieved, begin by troubleshooting B1006).

Signal error DTCs.

B-CAN SYSTEM DIAGNOSIS TEST MODE B

1. Using the Honda Diagnostic System (HDS), select the system that has the symptom from the BODY

ELECTRICAL MENU.

2. Select DTCs, and then check for loss of communication DTCs (use the DTC Troubleshooting Index to

find the DTC type).

Are loss of communication DTCs indicated?

YES: Go to step 3.

NO: Replace the MICU.

3. Perform the input test for the unit not communicating with the HDS.

MULTIPLEX INTEGRATED CONTROL UNIT INPUT TEST

GAUGE CONTROL MODULE INPUT TEST

DOOR MULTIPLEX CONTROL UNIT INPUT TEST

COMBINATION SWITCH CONTROL UNIT INPUT TEST

RELAY CONTROL MODULE INPUT TEST

NOTE:

Perform this diagnosis if any of the control units are not communicating
(NONE displayed in the HDS.) as found by the B-CAN system Diagnosis
Test Mode A.

Always cycle the ignition switch within 3 seconds when prompted in the
DTC troubleshooting procedures in this section.

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

DTC B1205: CLIMATE CONTROL UNIT LOST COMMUNICATION WITH THE
GAUGE CONTROL MODULE (VSP/NE MESSAGES); DTC B1206: CLIMATE
CONTROL UNIT LOST COMMUNICATION WITH THE GAUGE CONTROL MODULE
(ECT MESSAGES); DTC B1207: CLIMATE CONTROL UNIT LOST COMMUNICATION
WITH THE GAUGE CONTROL MODULE (ILLUMI MESSAGES)

B-CAN SYSTEM DIAGNOSIS TEST MODE C

1. Check for DTCs by selecting the TEST MODE MENU from the Honda Diagnostic System (HDS).

Are any DTCs indicated?

YES: Go to B-CAN System Diagnosis Test Mode A.

NO: Go to step 2.

2. Turn OFF the switch that controls the malfunctioning component.

3. Select DATA LIST from the TEST MODE MENU, and check the input of the switch that controls the

component.

Does the tester indicate the switch is OFF?

YES: Go to step 4.

NO: Go to step 6 .

4. In the DATA LIST of, check the output signal of the malfunctioning component.

Is the output signal OFF?

YES: Go to step 5.

NO: Replace the control unit that controls the device that will not turn OFF (see B-CAN
SYSTEM SWITCH DEVICE INDEX ).

5. Check the relay if applicable, then check for a short in the wire between the relay and the component,

relay and control unit or the component and control unit.

Are the relay and the wire harness OK?

YES: Replace the control unit that controls the component that will not turn OFF.

NO: Replace the relay or repair the wire harness.

6. Check the switch, then check for a short in the wire between the switch and the control unit that monitors

the switch.

Is the switch and wire harness OK?

NOTE:

Perform this diagnosis if a component that is controlled by the B-CAN
system does not stop or does not turn off.

If the component does not turn ON, go to B-CAN System Diagnosis Test
Mode D.

See the B-CAN system unit input/output index for a list of input and output
devices and the control units that monitor the input and controls the
output devices (see B-CAN SYSTEM SWITCH DEVICE INDEX ).

Always cycle the ignition switch within 3 seconds when prompted in the
DTC troubleshooting procedures in this section.

2004 Acura TSX

2004 ACCESSORIES & EQUIPMENT Multiplex Integrated Control System - TSX

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