Honda Odyssey 2004. Manual — part 478
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01
S0X4A00J46636234501KBAT00
YES
NO
YES
NO
YES
NO
22-240
22-240
Immobilizer System
Troubleshooting (cont’d)
Immobilizer Receiver Unit
Replacement
B
A
C
D
6. Check for continuity between the No. 4 terminal
and body ground.
Go to step 7.
Repair open in the BRN/BLK or BRN/YEL
(’02-03 models) wire between the immobilizer
receiver unit and G101.
7. Check for continuity between the No. 2 terminal
and the PCM.
• (’99-00 models) connector A No. 25 terminal
• (’01 model) connector E No. 31 terminal
• (’02-04 models) connector E No. 2 terminal
Go to step 8.
Repair open in the RED wire between the
immobilizer receiver unit and PCM.
8. Check for continuity between the No. 3 terminal
and PCM.
• (’99-00 models) connector A No. 13 terminal
• (’01 model) connector E No. 30 terminal
• (’02-04 models) connector E No. 12 terminal
Replace the immobilizer receiver unit.
Repair open in the BLU wire between the
immobilizer receiver unit and PCM.
1. Remove the driver’s dashboard lower cover (see
page 20-69).
2. Remove the steering column covers (see page 17-
25).
3. Disconnect the 5P and 7P connectors (A) from the
immobilizer receiver unit (B).
4. Remove the screws (C) and the immobilizer
receiver unit from the ignition key cylinder (D).
5. Install in the reverse order of removal.
6. After replacement, check the immobilizer system.
NOTE: The PCM does not need to be
reprogrammed if only the receiver has been
replaced.
Is ther e continuity?
Is ther e continuity?
Is ther e continuity?
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22-241
Multiplex Control System
Component Location Index
PASSENGER’S MULTIPLEX CONTROL UNIT
IGNITION KEY LIGHT
DOOR MULTIPLEX CONTROL UNIT
DRIVER’S MULTIPLEX CONTROL UNIT
MULTIPLEX CONTROL INSPECTION CONNECTOR
(Has built-in beeper)
Test, page 22-145
(Built into the power window master
switch)
(Near the brake pedal)
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22-242
Multiplex Control System
Circuit Diagram (Power, Ground, Communication Lines)
(Fuse/relay box socket)
(Fuse/relay box socket)
* A19 : ’99 02 and ’03 04 (EX, EXL) models
: ’03 04 (LX) models
A13
IGNITION SWITCH
B1
B9
A2
A15
WHT/BLU
WHT/BLU
No.51 (40A)
BLK
No.15 (20A)
BLK
A12
G503
BLK
B22
B11
G501
BLK
A2
GRN/WHT
A12
BLK
G401
BEEPER
A22
YEL
6
7
No.13
(7.5A)
No.47 (20A)
No.54 (40A)
YEL
A1
WHT/YEL
G551
BLK
*
BRN
A12
WHT/YEL
(10A)
A8
BLK
G581
3
1
A15
BLU/WHT
PNK
A24
WHT/YEL
BLK
A24
G401
WHT/YEL
BLK
BLK
BLK
3
1
A13
A14
A1
WHT/BLK
No.9
BATTERY
No.42 (50A)
UNDER HOOD FUSE/RELAY BOX
IG1
BAT
No.41 (120A)
WHT
BLK/YEL
DRIVER’S
UNDER DASH
FUSE/RELAY BOX
PASSENGER’S
UNDER DASH
FUSE/RELAY
BOX
IGNITION
KEY LIGHT
(LED)
DOOR
MULTIPLEX
CONTROL UNIT
DRIVER’S
MULTIPLEX
CONTROL UNIT
PASSENGER’S
MULTIPLEX
CONTROL UNIT
POWER
WINDOW
RELAY
PASSENGER’S
UNDER DASH
FUSE/RELAY BOX
MULTIPLEX
CONTROL
INSPECTION
CONNECTOR
IGNITION
KEY
SWITCH
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Multiplex Communication
Wake-up and Sleep
Fail-safe
22-243
System Descriptions
The multiplex control system has four internal
functions:
• Multiplexing (send multiple signals over shared
wires)
• Wake up/sleep modes (runs at full power only on
demand to reduce battery draw)
• Fail-safe (fixes or ignores faulty signals)
• Self-diagnosis (Mode 1 for the system, Mode 2 for
input lines)
The system controls the function of the following
circuits
• Engine Oil Pressure Indicator
• Seat Belt Reminder
• Lights-on Reminder
• Key-in Reminder
• Key Light Timer
• Dash Lights Brightness Control
• Entry Light Control (EX and EXL models)
• Automatic Lights-off (EX and EXL models)
• Power Window (including key-off timer operation)
• Wiper/Washers (including speed sensitive
intermittent wiper)
• Keyless/Power Door Locks
• Interlock
• Factory Security Alarm System (’01-04 EX and ’02-04
EXL models)
To reduce the number of wire harnesses, digital signals
are sent via shared multiplex communication lines
rather than sending normal electrical signals through
individual wires.
• The input signals from each switch are converted to
digital signals at the central processing unit (CPU).
The digital signals are sent from the transmitter unit
to the receiver unit as serial signals.
• The transmitted signal is converted to a switch signal
at the receiver unit, and it operates the related
component.
• There are exclusive communication lines between
each of the multiplex control units:
– Door
Driver’s (between the door and the driver’s
multiplex control units) Wire color: BRN
– Driver’s
Passenger’s (between the driver’s and
the passenger’s multiplex control units) Wire color:
PNK
The control units always communicate via these lines
when the system is operating, and they stop
communicating when the system is OFF.
The multiplex control system has ‘‘wake-up’’ and
‘‘sleep’’ functions to decrease parasitic draw on the
battery when the ignition switch is OFF.
• In the sleep mode, the multiplex control unit stops the
functions (communication and CPU control) when it
is not necessary for the system to operate.
• As soon as any operation is requested (for example,
door is unlocked), the related control unit in the sleep
mode immediately wakes up and begins to function.
This control unit also sends a wake-up signal to the
other control units via the communication lines.
• When the ignition switch is turned OFF, and driver’s
or front passenger’s door is opened then closed,
there is about a 10 second delay before the control
units go from the wake-up mode to the sleep mode.
• If any door is open, the sleep mode will not function.
• If a key is in the ignition switch, the sleep mode will
not function.
• If one of the key cylinder switch inputs is shorted, the
sleep mode will not function.
To prevent improper operation, the multiplex control
system has a fail-safe function. In the fail-safe mode,
the output signal is stopped when any part of the
system malfunctions (for example, a faulty control unit
or communication line).
Each control unit has a hardware fail-safe function that
stops the output signal when there is any CPU
malfunction, and a software fail-safe function that
ignores the signal from the malfunctioning control unit
and allows part of the system with no defect to operate
normally.
03/07/29 10:24:31 61S0X050_220_0245
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