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Acura CSX. Manual - part 511

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YES

Unit not communicating

22-94

Multiplex Integrated Control System

Troubleshooting - B-CAN System
Diagnosis Test Mode B

4. Select the system that has the problem from the

BODY ELECTRICAL menu, then select DTCs.

Go to step 5.

If the problem is related to one of the

following items, go to B-CAN System Diagnosis
Test Mode C (see page 22-95) if the system does
not stop or turn off. Go to Test Mode D (see page
22-96) if the system does not run or turn on.

• Exterior lights
• Turn signals
• Entry light control
• Interior lights
• Horn (security and panic)
• Wiper/washer

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

• Gauge control module
• Door-open and trunk-open indicators
• Chimes (key-in, seat belt, lights-on, and parking

brake)

• Security
• Keyless entry
• Key interlock
• Dash light brightness control
• Audio system
• Navigation (if equipped)
• HandsFreeLink (if equipped)

5. Record all DTCs, and sort them by DTC type.

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

• Battery voltage DTCs.
• Internal error DTCs.
• Loss of communication DTCs. Begin

troubleshooting with the lowest number first
(Example: if DTC B1008 and B1011 are retrieved,
begin by troubleshooting B1008).

• Signal error DTCs.

Do this diagnosis if any of the control units are not
communicating (Not Available is displayed in the HDS)
as found by the B-CAN System Diagnosis Test Mode A
(see page 22-93).

1. Using the HDS, select the system that has the

symptom from the BODY ELECTRICAL menu.

2. Select DTCs, and then check for loss of

communication DTCs.

Go to step 3.

Replace the MICU.

3. Do the input test for the unit not communicating

with the HDS.

MICU (see page 22-109)
Gauge control module (see page 22-271)
Immobilizer-keyless control unit (see page
22-330)
Climate control unit (see page 21-24)
HandsFreeLink control unit (see page 23-388)

Ar e any DT Cs indicated?

Ar e any loss of communication DT Cs indicated?

08/08/21 14:24:59 61SNR030_220_0096

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YES

22-95

Troubleshooting - B-CAN System Diagnosis Test Mode C

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

NOTE:

• If the component does not turn on, go to B-CAN

System Diagnosis Test Mode D (see page 22-96).

• 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 page 22-88).

• Always cycle the ignition switch within 3 seconds

when prompted in the DTC troubleshooting
procedures.

1. Check for DTCs by selecting the TEST MODE menu

from the HDS.

Go to B-CAN System Diagnosis Test Mode A

(see page 22-93).

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.

Go to step 4.

Go to step 6.

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

malfunctioning component.

Go to step 5.

Replace the control unit that controls the

device that will not turn OFF.

5. Check the relay, if applicable, then check for a short

in the wire between the relay and the component,
the relay and control unit, or the component and
control unit.

Replace the control unit that controls the

component that will not turn OFF.

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.

Replace the control unit that monitors the

switch.

Replace the switch or repair the wire

harness.

Ar e any DT Cs indicated?

Does the HDS indicate the switch is OF F ?

Is the output signal OF F ?

Ar e the r elay and the wir e har ness OK ?

Ar e the switch and wir e har ness OK ?

08/08/21 14:24:59 61SNR030_220_0097

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YES

22-96

Multiplex Integrated Control System

Troubleshooting - B-CAN System Diagnosis Test Mode D

Do this diagnosis if a component that is controlled by
the B-CAN system does not run or come on.

NOTE:

• If the component does not turn off or stop, go to B-

CAN System Diagnosis Test Mode C (see page 22-95).

• See the B-CAN system unit input/output index for a

list of input and output devices and the control units
that monitor the inputs and control the output devices
(see page 22-88).

• Always cycle the ignition switch within 3 seconds

when prompted in the DTC troubleshooting
procedures.

1. Check the fuse of the malfunctioning output device.

Go to step 2.

Replace the fuse and recheck.

2. Check for DTCs by selecting the TEST MODE menu

from the HDS.

Go to B-CAN System Diagnosis Test Mode A

(see page 22-93).

Go to step 3.

3. Turn ON the switch that controls the

malfunctioning component.

4. Select DATA LIST from the TEST MODE menu, and

check output signal for the malfunctioning
component.

Go to step 5.

Go to step 9.

5. Check the relay and ground, then check for an open

or a short in the circuit for the malfunctioning
component.

Go to step 6.

Replace the relay or repair the wire circuit.

6. Do the function test for the malfunctioning

component.

Go to step 7.

Replace the component.

7. With the malfunctioning output device connected,

connect a voltmeter between the malfunctioning
output device and body ground on the wire that the
control unit uses to control the output device circuit.

8. Select MISC. TEST from the TEST MODE menu,

and do the forced operation test of the
malfunctioning component.

Inspect the ground for the component. If OK,

replace the component.

Replace the control unit that controls the

malfunctioning component.

9. Select DATA LIST from the TEST MODE menu, and

make sure the switch signal input for the
malfunctioning system indicates a change when
operated.

Replace the control unit that controls the

malfunctioning component.

Go to step 10.

10. Check the switch and its ground (if applicable), then

check for an open or a short in the wire between
the switch and the control unit that monitors it.

Replace the control unit that monitors the

switch.

Replace the switch or repair the wire

harness.

Is the f use OK ?

Ar e any DT Cs indicated ?

Is ther e an output signal?

Ar e the r elay and cir cuit OK ?

Does the output device pass the f unction test?

Is ther e a change in voltage ( 12 V to 0 V or
0 V to 12 V )?

Does the switch input indicate ON when the switch
is ON?

Is the switch and the wir e har ness OK ?

08/08/21 14:24:59 61SNR030_220_0098

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Special Tools Required

YES

Test Mode 1

Test Mode 2

22-97

Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2
(without the HDS)

A
(07WAZ-001010A)

MPCS (MCIC) service connector 07WAZ-001010A

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 HDS is not
available.

1. Check the No. 23 (10 A) fuse in the under-hood

fuse/relay box and No. 10 (7.5 A) fuse in the under-
dash fuse/relay box.

Go to step 2.

Find and repair the cause of the blown fuse.

2. Remove the left kick panel (see page 20-66).

3. Turn the ignition switch to ON (II), and move the

ceiling light switch to the middle (door) position.

4. Connect the MPCS service connector (A) to the

MCIC socket (B) in the under-dash fuse/relay box.

5. Wait 5 seconds, and watch the ceiling light. When

the ceiling light flashes quickly once, and then goes
off the system is in Test Mode 1.

6. Check for B-CAN DTCs indicated by the gauge

control module (tach) odometer/trip meter display
while still in Test Mode 1. Push the SEL/RESET
switch button to display the next code. After you
get to the last code, the display shows END. If no
DTCs are stored, the display will read NO.

Go to step 7.

Go to step 10.

7. Record all DTCs and sort them.

8. Troubleshoot the DTCs in this order:

• Battery voltage DTCs
• Internal error DTCs
• Loss of communication DTCs (begin with the

lowest number first; for example, if B1008 and
B1011 are retrieved, troubleshoot B1008 first)

• Signal error DTCs

9. Clear the DTCs by pressing and holding the SEL/

RESET switch button for about 10 seconds. You will
hear a beep to confirm the codes have been cleared.
Operate the devices that failed, and recheck for
codes.

10. Remove the MPCS service connector from the

under-dash fuse/relay box socket for
5

10 seconds, then re-insert it to enter Mode 2.

When the system enters Mode 2, the ceiling light
will flash two times quickly and then go off.

NOTE: If the MPCS service connector is
disconnected for too short or too long of a time, or
the ignition switch is turned to LOCK (0), the
system will return to Test Mode 1.

11. The following tables list the circuits that can be

checked in Test Mode 2. Operate the switch that is
most closely related to the problem. If the circuit is
OK, the ceiling light will blink once. If the circuit is
faulty, there will be no indication.

Ar e the f uses OK ?

Ar e any DT Cs indicated?

08/08/21 14:24:59 61SNR030_220_0099

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