light ACURA CSX 2006 Service Repair Manual

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Special Tools Required
YES
NO YES
NO
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?
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MICU
Item
YES
NO
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)
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 work properly in all switch posi t i ons?
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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)
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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
H2
H1 Q6
B-CAN
MICU
G401 PNK
K4 G2
UNDER-DASH FUSE/RELAY BOX
UNDER-HOOD FUSE/RELAY BOX
WHTBRN
No. 10 (7.5 A)
BLK F20
No. 2 (IG) (50 A)
ORNIG1
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-LINEQ8





 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
F28VBU
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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Cavity Wire Test conditionTest: Desired result Possible cause if desired result is
not obtained
Cavity Wire Test condition Test: Desired result Possible cause if desired result is
not obtained
22-111
5. With the connector still disconnected, do these input tests at the following connectors.
 If any test indicates a problem, find and correct the cause, then recheck the system.
 If all the input tests prove OK, go to step 6.






G2 ORN Under all conditions Measure the voltage to ground:
There should be battery voltage.Blown No. 23 (10 A) fuse in the
under-hood fuse/relay box
An open in the wire
K4 PNK Under all conditions Attach to ground: The ceiling light should come
on.Blown No. 22 (7.5 A) fuse in the
under-hood fuse/relay box
Blown bulb(s)
Faulty ceiling light
An open in the wire
6. Reconnect the connectors to the under-dash fuse/relay box, and do these input tests at the following connectors.  If any test indicates a problem, find and correct the cause, then recheck the system.
 If all the input tests prove OK, the MICU must be faulty; replace the under-dash fuse/relay box.








E6 BLK Under all conditions Measure the voltage to ground:
There should be less than 0.5 V.Poor ground (G602)
An open in the wire
E33 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.Poor ground (G601)
An open in the wire
F20 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.Poor ground (G401)
An open in the wire
T34 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.Poor ground (G501)
An open in the wire
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22-112Keyless/Power Door Locks/Security System
Component Location Index
NAVIGATION UNIT or
AUDIO UNIT
IMMOBILIZER-KEYLESS
CONTORL UNIT
(With built-in receiver)
SECURITY INDICATOR GAUGE CONTORL MODULE
(SPEEDO)
HEADLIGHT
HOOD SWITCH
MICU
(Built into the under-
dash fuse/relay box)
HORN
TRANSMITTER
LOCK BUTTON TRUNK BUTTON
UNLOCK BUTTON
IGNITION KEY PANIC BUTTONSymptom Troubleshooting,
page 22-126
Replacement, page 22-332
Replacement, page 22-174
Adjustment, page 22-173
Bulb Replacement, page 22-177
Test, page 22-141
Input Test, page 22-131
Test/Replacement, page 22-146
Test/Replacement, page 22-142
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22-113
LEFT REAR DOOR LOCK
ACTUATOR/
KNOB SWITCHDRIVER’S DOOR KEY CYLINDER SWITCH
DRIVER’S DOOR LOCK SWITCH
(Built into the power
window master switch) DRIVER’S DOOR LOCK
ACTUATOR/
KNOB SWITCH TRUNK LID RELEASE ACTUATOR/
LATCH SWITCH
LEFT REAR DOOR SWITCH IGNITION KEY SWITCH
DRIVER’S DOOR
SWITCH
RIGHT REAR DOOR LOCK
ACTUATOR/KNOB SWITCHFRONT PASSENGER’S
DOOR SWITCHFRONT PASSENGER’S DOOR
LOCK ACTUATOR/KNOB SWITCH
FRONT PASSENGER’S
DOOR LOCK SWITCH
RIGHT REAR DOOR SWITCH
LICENSE PLATE LIGHTS
INNER TAILLIGHTTAILLIGHTActuator Test,
page 22-137
Knob Switch Test,
page 22-138 Test, page 22-140
Replacement, page 20-9
Test, page 22-139 Acutuator Test,page 22-137
Knob Switch Test, page 22-138 Actuator Test, page 22-141
Latch Switch Test, page 22-200
Test, page 22-207
Actuator Test, page 22-137
Knob Switch Test, page 22-138 Actuator Test, page 22-137
Knob Switch Test, page 22-138
Test, page 22-139
Replacement, page 22-139
Replacement, page 22-180
Replacement,page 22-179
Replacement, page 22-179
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Security Alarm System
22-114Keyless/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 i
nputs 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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22-116Keyless/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
BLK10LOCK
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
WHTT23
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-
LOCKUN-
LOCK
UN-
LOCK
DRIVER’S
DOOR LOCK
SWITCH DRIVER’S
DOOR KEY
CYLINDER
SWITCHDRIVER’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
BBACKUPWHT
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