Acura CSX. Manual — part 512
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MICU
Item
YES
NO
22-98
Multiplex Integrated Control System
Driver’s door lock switch (UNLOCK)
Driver’s door lock switch (LOCK)
Driver’s door lock knob switch (UNLOCK)
Driver’s door lock knob switch (LOCK)
Driver’s door key cylinder switch (UNLOCK)
Driver’s door key cylinder switch (LOCK)
Front passenger’s door lock switch (UNLOCK)
Front passenger’s door lock switch (LOCK)
Front passenger’s door lock knob switch
(UNLOCK)
Left rear door lock knob switch (UNLOCK)
Right rear door lock knob switch (UNLOCK)
Driver’s door switch (OPEN)
Front passenger’s door switch (OPEN)
Left rear door switch (OPEN)
Right rear door switch (OPEN)
Trunk lid latch switch (OPEN)
Audio switch
Windshield wiper HI/LO switch
Windshield wiper INT/LO switch
Windshield wiper MIST switch
Windshield washer switch (ON)
Windshield wiper intermittent dwell time
controller
Windshield wiper motor park switch
Turn signal switch (LEFT)
Turn signal switch (RIGHT)
Hazard warning switch (ON)
Headlight switch (ON)
Headlight switch (OFF)
Lighting switch (ON)
Dimmer switch (ON)
Passing switch (ON)
Fog light switch (ON)
Hood switch (OPEN)
A/C pressure switch/thermal protector
Transmission range switch (P)
Ignition key cylinder switch
Brake switch (ON)
: A second key is necessary to check the key
cylinder inputs.
Be sure to rotate the key cylinder switch two
times to each position (lock and lock, unlock
and unlock) to ensure the door lock knob
switch is in the appropriate position.
Go to function and input test for the system
related to the failure.
Repair the open, short, or replace the faulty
switch.
Does the ceiling light wor k pr oper ly in all switch
positions?
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SNR9A00J00050600000FEAT00
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, immobilizer-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)
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*90
SNR9A00J00050600000EAAT20
22-100
Multiplex Integrated Control System
Circuit Diagram
K5
G3
Q1
Q9
D2
LT BLU
RED
No. 22 (7.5 A)
BLK
G501
T34
G602
E6
BLK
SG
G601
E33
BLK
PG
H2
H1
Q6
B-CAN
MICU
G401
PNK
K4
G2
UNDER-DASH FUSE/RELAY BOX
UNDER-HOOD FUSE/RELAY BOX
WHT
BRN
No. 10 (7.5 A)
BLK
F20
No. 2 (IG) (50 A)
ORN
IG1
BAT
BLU
WHT
No. 23 (10 A)
BATTERY
IGNITION SWITCH
No. 1 (BAT) (100 A)
MICU
SERVICE
CHECK
CONNECTOR
IG1 HOT in ON (II)
and START (III)
CEILING
LIGHT
H1
D4
D2
LT BLU
K-LINE
Q8
•
•
•
•
•
•
AUDIO UNIT*6
NAVIGATION
UNIT*5
DATA LINK
CONNECTOR
IMMOBILIZER-
KEYLESS
CONTROL UNIT
SRS UNIT
TPMS CONTROL
UNIT*3
• ABS
MODULATOR-
CONTROL UNIT *1
EPS CONTROL
UNIT
• VSA
MODULATOR-
CONTROL UNIT *2
IG1
LT BLU
LT BLU
F14
F28
VBU
16
G501
BLK
1
18
PNK
No. 35 (7.5 A)
FUSE
(UNDER-DASH
FUSE/
RELAY BOX)
No. 23 (10 A)
FUSE
(UNDER-DASH
FUSE/
RELAY BOX)
15
PUR
WHT
HANDSFREELINK
CONTROL UNIT
*4
(B-CAN)
PNK
PNK
(B-CAN)
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*90
−
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22-101
•
•
•
•
•
•
•
•
124
19
1
RED
WHT
CAN L
F-CAN TRANSCEIVER
CAN H
LT GRN
3
G504
BLK
5
32
PNK
(B-CAN)
(B-CAN)
BRN/YEL
BRN
LG
G101
BLK
7
2
IG1
YEL
VBU
B-CAN
1
4
PNK
16
BLK
G504
WHT
21
PNK
GAUGE CONTROL MODULE (TACH)
BRN
WHT
17
18
MAIN CIRCUIT
B-CAN
TRANSCEIVER
LCD DISPLAY
(DTC CODE DISPLAY)
IMMOBILIZER-KEYLESS
CONTROL UNIT
CLIMATE
CONTROL UNIT
No. 36 (10 A) FUSE
(UNDER-DASH
FUSE/RELAY BOX)
ABS MODULATOR-CONTROL UNIT*1
VSA MODURATOR-CONTROL UNIT*2
YAW RATE-LATERAL ACCELERATION
SENSOR*2
DATA LINK CONNECTOR
SRS UNIT
ECM/PCM
TPMS CONTROL UNIT*3
EPS CONTROL UNIT
WHT
: CAN line
No. 2 (15 A) FUSE
(UNDER-DASH
FUSE/RELAY BOX)
: Other communication line
*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
*5: With navigation system
*6: Without navigation system
BLK*2
PNK
PNK
08/08/21 14:25:01 61SNR030_220_0103
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