2006 ACURA CSX Service Repair Manual

roof winter tires water pump maintenance schedule USB port parking brake

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ACURA CSX 2006 Service Repair Manual (#)
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NOUnit not communicating
22-9422-94Multiplex Integrated Control System
Troubleshooting - B-CAN System
Diagnosis Test Mode

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NOUnit not communicating
22-9422-94Multiplex Integrated Control System
Troubleshooting - B-CAN System
Diagnosis Test Mode A (cont’d)
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
Keyinterlock
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. Begintroubleshooting with the lowest number first
(Example: if DTC B1008 and B1011 are retrieved,
begin by troubleshooting B 1008).
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)
Are any DTCs indicated?
Ar e any l oss of communi cat i on DT Cs i nd i cat ed ?
08/08/21 14:24:59 61SNR030_220_0096
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ACURA CSX 2006 Service Repair Manual (#)
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22-95
Troubleshooting - B-CAN System Diagnosis Test Mode C
Do this diagnos

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ACURA CSX 2006 Service Repair Manual (#)
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22-96
Multiplex Integrated Co

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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.
IsthefuseOK?
Ar e any DT Cs i nd i cat ed ?
Is t her e an out put si gnal ?Ar e t he r el ay and ci r cui t OK ? Does t he out put d ev i ce pass t he f unct i on t est ?
I s t her e a change i n v ol t age ( 12 V t o 0 V or0V to12V)?
Does the switch input indicate ON when the switchis ON?
I s t he sw i t ch and t he w i r e har ness OK ?
08/08/21 14:24:59 61SNR030_220_0098
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ACURA CSX 2006 Service Repair Manual µ

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Test Mode 1
Test Mode 2
22-97
Troubleshooting - B-CAN System Diagnosis Test Mode 1 and

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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)B
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 ce iling 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 thelowest number first; for example, if B1008 and
B1011 are retrieved, troubleshoot B 1008 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.
(cont’d)
Ar e t he f uses OK ? Are any DTCs indicated?
08/08/21 14:24:59 61SNR030_220_0099
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ACURA CSX 2006 Service Repair Manual µ
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Item
YES
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22-98Multiplex Integrated Control System
Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2
(without the HDS) (cont’d)
Driver’s door lock switch (UNLOCK)

Page 2046 of 2893

ACURA CSX 2006 Service Repair Manual (#)
22-99
Sleep and Wake-up Mode Test
1. Shift to the sleep mode:Turn the ignition switch to LOCK (0), and remove the key. If the MICU receives no signal

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22-99
Sleep and Wake-up Mode Test
1. Shift to the sleep mode:Turn the ignition switch to LOCK (0), and remove the key. If the MICU receives no signals from the inputs listed
below, it will go into sleep mode in less than 40 seconds.
Driver’s door lock switch (LOCK or UNLOCK)
Driver’s door key cylinder switch (LOCK or UNLOCK)
Front passenger’s door lock switch (LOCK or UNLOCK)
Trunk lid latch switch (Trunk lid closed)
Hazard warning switch (OFF)
2. Confirm the sleep mode: Measure the frequency on the B-CAN communication line (PNK wire); there should be 0 Hz when the system is in
the sleep mode. Check the parasitic draw at the battery while shifting into the sleep mode; the amperage should
change from about 200 mA to less than 35 mA.
3. Shift to the wake up mode: When the ignition switch is turned to ON (II), the MICU, gauge control module, immob ilizer-keyless control unit,
and ECM/PCM wake up at the same time without ‘‘talking’’ to each other through the communication lines. When
any switch in the multiplex integrated control system is turned on, it wakes up its related control unit which, in
turn, wakes up the other units. After confirming the sleep mode, look in the following table for the switch most
related to the problem. Operate that switch and see if its control unit wakes up.
NOTE: If any control unit is faulty and will not wake up, several circuits in the system will malfunction at the same
time. In the table below, the control unit is followed by a list of the switches and input signals that can wake it up.
Door switches (door open)
Driver’s door lock switch (LOCK or UNLOCK)
Driver’s door lock knob switch (LOCK or UNLOCK)
Driver’s door key cylinder switch (LOCK or UNLOCK)
Front passenger’s door lock switch (LOCK or UNLOCK)
Front passenger’s door lock knob switch (LOCK or UNLOCK)
Left rear door lock knob switch
Right rear door lock knob switch
Trunk lid latch switch (Trunk lid open)
Hood switch (with security) (hood open)
Hazard warning switch (ON)
Combination light switch (Parking, Headlight, Dimmer, Passing ON)
Ignition key switch (key inserted)
08/08/21 14:25:00 61SNR030_220_0101
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Page 2047 of 2893

ACURA CSX 2006 Service Repair Manual Î(#)
22-100Multiplex Integrated Control System
Circuit Diagram
K5
G3 Q1 Q9
D2
LT BLU RED
No. 22 (7.5 A)
BLK
G501 T34
G602E6
BLK SG
G601E33
BLK
PG
H

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ACURA CSX 2006 Service Repair Manual Î
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19
1
RED
WHT CAN L
F-CAN TRANSCEIVER
CAN H
LT GRN
3
G504BLK
5
32
PNK
(B-CAN) (B-CAN) BRN/YELBRNLG
G101 BLK
7 2
IG1
YEL
VBU
B-CAN 1
4
PNK
16
BLK
G504 WHT
2

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