Acura CSX. Manual — part 516
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Security Alarm System
22-114
Keyless/Power Door Locks/Security System
System Description
The security alarm system is armed automatically after the doors, hood, and trunk are closed and locked. For the
system to arm, the ignition switch must be to LOCK (0), the key must be removed from the ignition switch, and the
MICU must receive signals that the doors, hood, and trunk are closed and locked. The alarm can be disarmed at any
time by unlocking the driver’s door with the key or pressing the UNLOCK button on the transmitter.
When everything is closed and locked, the only inputs that are grounded, and have 0 V, are the driver’s door lock knob
switch (LOCK position), and the audio unit or navigation unit (if equipped). In other words, all of the other switches are
open, and have about 10 to 12 V, including the key cylinder switches. The security indicator in the gauge control
module (speedo) begins to flash immediately after the vehicle is completely closed and locked, and 15 seconds later,
the security system arms. If the security indicator does not flash, the system is not arming. A beep sounds and parking
lights flash to confirm the security alarm system is armed if the LOCK button is pressed a second time within
5 seconds.
If one of the switches is misadjusted or shorted internally, or there is a short in the circuit, the security system will not
arm. As long as the control unit continues to receive a ground signal (0 V), it senses that the vehicle is not closed and
locked, and the system will not arm. A switch that is slightly misadjusted can cause the alarm to sound for no apparent
reason. In this case, a significant change in outside air temperature, the vibration of a passing truck, or someone
bumping into the vehicle could cause the alarm to sound. There is no glass breakage or motion detector feature.
If anything is opened or improperly unlocked after the system is armed, the control unit receives a ground signal from
that switch, and the 10 to 12 V reference drops to 0 V. If the audio unit or navigation unit (if equipped) is disconnected,
the input loses its ground, and the input voltage goes to 10 to 12 V. The system sounds the alarm when any of these
occur:
• A door or the trunk is forced open.
• A door is unlocked without using the key or the transmitter.
• The hood is opened.
• The audio unit or navigation unit (if equipped) is disconnected.
• The transmitter PANIC button is pressed.
When the system sounds the alarm, the horn sounds and the exterior lights flash for 2 minutes. The alarm can be
stopped at any time by unlocking the driver’s door with the key or by pressing any button on the transmitter.
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Panic Mode
Keyless Entry System
22-115
The panic mode sounds the alarm in order to attract attention. When the PANIC button on the transmitter is pressed
and held for 2 seconds, the horn sounds and the exterior lights flash for about 20 seconds.
The panic mode can be cancelled at anytime by pressing any button on the transmitter or by turning the ignition
switch to ON (II). The panic mode will not function if the ignition switch is to ON (II).
The keyless entry system is integrated with the multiplex integrated control system. The multiplex integrated control
unit (MICU) receives LOCK, UNLOCK and PANIC signals from the immobilizer-keyless control unit (keyless receiver).
The keyless entry system allows you to lock and unlock the vehicle with the transmitter.
When the switch for the ceiling light is in the center (DOOR) position, it will come on when the UNLOCK button is
pressed. If a door is not opened, the light will go off in about 30 seconds, and the doors will relock. If the doors are
locked with the transmitter within 30 seconds, the light will go off immediately.
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+
22-116
Keyless/Power Door Locks/Security System
Circuit Diagram
Q1
G2
G21
D2
ORN
GRN
BRN
G503
G501
G504
G504
IG1 HOT in ON (II) and START (III)
8
T22
LT BLU
BLK
10
LOCK
LOCK
YEL
T30
1
6
PUR
T29
BLK
2
11
BLK
T27
GRY
19
17
T28
BLU
LOCK
LOCK
KEY
MICU
No. 25 (20 A)
ORN
IG1
5
BLK
No. 23 (10 A)
T24
LT GRN
6
UNDER-DASH FUSE/RELAY BOX
WHT
T23
7
LOCK
PNK
T32
9
8
BRN
T31
No. 10 (7.5 A)
BLU
IGNITION SWITCH
IG1
BAT
BLU
WHT
No. 4 (P/W) (40 A)
BATTERY
No. 1 (BAT) (100 A)
No. 2 (IG) (50 A)
UNDER-HOOD FUSE/RELAY BOX
UN-
LOCK
UN-
LOCK
UN-
LOCK
DRIVER’S
DOOR LOCK
SWITCH
DRIVER’S
DOOR KEY
CYLINDER
SWITCH
DRIVER’S
DOOR LOCK
KNOB SWITCH
DOOR
LOCK
KNOB
DOOR
LOCK
KNOB
FRONT
PASSENGER’S
DOOR LOCK
KNOB SWITCH
FRONT
PASSENGER’S
DOOR LOCK
SWITCH
UN-
LOCK
UN-
LOCK
LIGHT
(LED)
LIGHT
(LED)
H1
K2
D4
B BACK UP
WHT
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22-117
UART
UART
MAIN CIRCUIT
PNK
PNK
20*1
21
LT GRN*1
T34
E6
G501
BLK
SG
BLK
G602
PG
F20
E33
G601
BLK
BLK
G401
YEL
BLU
BLU
BLU
B-CAN
M10
E21
E31
BLU
E1
E14
YEL
4
3
1
2
N7
YEL
M8
4
BLU
3
N13
1
BLU
2
YEL
A
MICU
1
Q6
4
PNK
WHT
IMMOBILIZER-KEYLESS
CONTROL UNIT
DRIVER’S
DOOR LOCK
ACTUATOR
FRONT
PASSENGER’S
DOOR LOCK
ACTUATOR
LEFT REAR DOOR
LOCK ACTUATOR
RIGHT REAR DOOR
LOCK ACTUATOR
SECURITY
INDICATOR
(LED)
B-CAN
TRANSCEIVER
GAUGE CONTROL
MODULE (TACH)
GAUGE CONTROL
MODULE (SPEEDO)
: CAN line
2*2
7*1
1*2
GRY*2
*1: Except TYPE S model
*2: TYPE S model
: Other communication line
UNDER-DASH FUSE/RELAY BOX
UNLOCK
(DR)
UNLOCK
LOCK
TRANSMITTER
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