Infiniti Q45 (FY33). Manual — part 323
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SEL366V
Electrical Components Inspection
ASCD STEERING SWITCH
Check continuity between terminals by pushing each button.
Button
Terminal
q
1
q
3
q
2
q
4
q
5
SET/COAST
q
q
RESUME/ACCEL
q
q
CANCEL
q
E
q
q
E
q
MAIN
q
q
CEL488
ASCD BRAKE SWITCH AND STOP LAMP SWITCH
Condition
Continuity
ASCD brake
switch
Stop lamp switch
When brake pedal is depressed
No
Yes
When brake pedal is released
Yes
No
Check each switch after adjusting brake pedal — refer to BR
section, “BRAKE PEDAL AND BRACKET”.
CEL333-B
PARK/NEUTRAL POSITION SWITCH
Check continuity between terminals by setting selector lever to
each position.
Selector lever position
Terminal
q
3
q
7
q
9
“N”
q
q
“P”
q
q
Others
CEL490
DIODE
I
Check continuity using an ohmmeter.
I
Diode is functioning properly if test results are as shown in the
figure at left.
NOTE: Specifications may vary depending on the type of
tester. Before performing this inspection, be sure to
refer to the instruction manual for your tester.
Terminals
Continuity
q
1
q
2
Yes
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EL-283
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ASCD Wire Adjustment
CEL434
CAUTION:
I
Be careful not to twist ASCD wire when removing it.
I
Do not tense ASCD wire excessively during adjustment.
Adjust the tension of ASCD wire in the following manner.
1.
Loosen lock nut and adjusting nut.
2.
Make sure that accelerator wire is properly adjusted. (Refer to
FE section, “ACCELERATOR CONTROL SYSTEM”.)
3.
Tighten adjusting nut until throttle drum just starts to move.
4.
Loosen adjusting nut again 1/2 to 1 turn.
5.
Tighten lock nut.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EL-284
Overall Description
OUTLINE
The In-Vehicle Multiplexing System, IVMS (LAN system), consists of a BCM (Body Control Module) and five
LCUs (Local Control Units). Some switches and electrical loads are connected to each LCU. Some electrical
systems are directly connected to the BCM. Control of each LCU, (which is provided by a switch and electri-
cal load), is accomplished by the BCM, via multiplex data lines (A-1, A-2 or A-3) connected between them.
BCM (Body Control Module)
The BCM, which is a master unit of the IVMS (LAN), consists of microprocessor, memory and communication
LSI sections and has communication and control functions. It receives data signals from the LCUs and sends
electrical load data signals to them.
LCU (Local Control Unit)
The LCUs, which are slave units of the BCM, have only a communication function and consist of communi-
cation LSI and input-output interface circuits. They receive data signals from the BCM, control the ON/OFF
operations of electrical loads and the sleep operation, as well as send switch signals to the BCM.
CONTROLLED SYSTEMS
The IVMS controls several body-electrical systems. The systems included in the IVMS are as follows:
I
Power window
I
Power door lock
I
Multi-remote control system
I
Vehicle security system
I
Interior illumination control system
I
Step lamp
I
Illumination (Power window switch illumination)
I
Auto drive positioner
I
Auto light (Refer to “HEADLAMP”, EL-79.)
I
Door open warning (Refer to “WARNING LAMPS”, EL-156.)
I
Ignition key warning (Refer to “WARNING CHIME”, EL-173.)
I
Light warning (Refer to “WARNING CHIME”, EL-173.)
I
Seat belt warning (Refer to “WARNING CHIME”, EL-174.)
I
Wiper amp. (Refer to “WIPER AND WASHER”, EL-183.)
I
Rear window defogger timer (Refer to “REAR WINDOW DEFOGGER”, EL-204.)
I
Trouble-diagnosing system
— with CONSULT-II
— ON BOARD
Also, IVMS has the “sleep/wake-up control” function. IVMS puts itself (the whole IVMS system) to sleep under
certain conditions to prevent unnecessary power consumption. Then, when a certain input is detected, the
system wakes itself up. For more detailed information, refer to “Sleep/Wake-up Control”.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
IVMS (LAN)
EL-285
![](/vehicles/zatt/fitanyou/tushi/shan.png)
Component Parts Location
SEL934U
IVMS (LAN)
EL-286
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