Nissan Quest E52. Instruction — part 927
PCS
SYSTEM
PCS-5
< SYSTEM DESCRIPTION >
[IPDM E/R]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
SYSTEM
RELAY CONTROL SYSTEM
RELAY CONTROL SYSTEM : System Description
INFOID:0000000009652846
SYSTEM DIAGRAM
DESCRIPTION
IPDM E/R activates the internal control circuit to perform the relay ON-OFF control according to the input sig-
nals from various sensors and the request signals received from control units via CAN communication.
CAUTION:
To prevent damage to the parts, IPDM E/R integrated relays cannot be removed.
JMMIA0834GB
PCS-6
< SYSTEM DESCRIPTION >
[IPDM E/R]
SYSTEM
*: BCM controls the starter relay.
RELAY CONTROL SYSTEM : Fail-safe
INFOID:0000000009978055
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With ECM
Control relay
Input/output
Transmit unit
Control part
Reference page
Headlamp low relay
Low beam request signal
BCM (CAN)
Headlamp (LO)
•
(Xenon
type)
•
(Halo-
gen type)
Headlamp high relay
High beam request signal
BCM (CAN)
Headlamp (HI)
Front fog lamp relay
Front fog light request signal
BCM (CAN)
Front fog lamp
•
(Xenon
type)
•
(Halo-
gen type)
Tail lamp relay
Position light request signal
BCM (CAN)
• Parking lamp
• license plate lamp
• Tail lamp
• Side marker lamp
•
(Xenon
type)
•
(Halo-
gen type)
Illumination
• Front wiper relay
• Front wiper high relay
Front wiper request signal
BCM (CAN)
Front wiper motor
Front wiper stop position sig-
nal
Front wiper motor
Horn relay
• Theft warning horn request
signal
• Horn reminder signal
BCM (CAN)
• Horn (high)
• Horn (low)
• Starter relay*
• Starter control relay
Starter control relay signal
BCM (CAN)
Starter motor
Starter relay control signal
TCM
Starter motor relay cut off sig-
nal
ECM (CAN)
A/C relay
A/C compressor request sig-
nal
ECM (CAN)
A/C compressor
(magnet clutch)
•
(Auto-
matic air condi-
tioning)
•
(Manu-
al air condition-
ing)
• Cooling fan relay-1
• Cooling fan relay-2
• Cooling fan relay-3
Cooling fan speed request sig-
nal
ECM (CAN)
• Cooling fan motor-1
• Cooling fan motor-2
Ignition relay
Ignition switch ON signal
BCM (CAN)
Each control unit, sensor,
actuator and relay (igni-
tion power supply)
Vehicle speed signal
Combination meter
(CAN)
Push-button ignition switch
signal
Push-button ignition
switch
Daytime running light relay
Daytime running light request
signal
BCM (CAN)
Headlamp (HI)
•
(Xenon
type)
•
(Halo-
gen type)
PCS
SYSTEM
PCS-7
< SYSTEM DESCRIPTION >
[IPDM E/R]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
If No CAN Communication Is Available With BCM
IGNITION RELAY MALFUNCTION DETECTION FUNCTION
• IPDM E/R monitors the voltage at the contact circuit and excitation coil circuit of the ignition relay inside it.
• IPDM E/R judges the ignition relay error if the voltage differs between the contact circuit and the excitation
coil circuit.
• If the ignition relay cannot turn OFF due to contact seizure, it activates the tail lamp relay and daytime run-
ning light relay for 10 minutes to alert the user to the ignition relay malfunction when the ignition switch is
turned OFF.
FRONT WIPER PROTECTION FUNCTION
IPDM E/R detects front wiper stop position by a front wiper stop position signal.
When a front wiper stop position signal is in the conditions listed below, IPDM E/R stops power supply to wiper
after repeating a front wiper 10 seconds activation and 20 seconds stop five times.
Control part
Fail-safe operation
Cooling fan
• Turns ON the cooling fan relay-2 and the cooling fan relay-3 when the ignition switch is
turned ON (Cooling fan operates at HI)
• Turns OFF the cooling fan relay-1, the cooling fan relay-2 and the cooling fan relay-3
when the ignition switch is turned OFF (Cooling fan does not operate)
A/C compressor
A/C relay OFF
Alternator
Outputs the power generation command signal (PWM signal) 0%
Control part
Fail-safe operation
Headlamp
• Turns ON the headlamp low relay when the ignition switch is turned ON
• Turns OFF the headlamp low relay when the ignition switch is turned OFF
• Headlamp high relay OFF
• Parking lamp
• License plate lamp
• Illumination
• Tail lamp
• Side marker lamp
• Turns ON the tail lamp relay when the ignition switch is turned ON
• Turns OFF the tail lamp relay when the ignition switch is turned OFF
Front wiper motor
• The status just before activation of fail-safe control is maintained until the ignition switch
is turned OFF while the front wiper is operating at LO or HI speed.
• The wiper is operated at LO speed until the ignition switch is turned OFF if the fail-safe
control is activated while the front wiper is set in the AUTO mode and the front wiper motor
is operating.
• Returns automatically wiper to stop position when ignition switch is turned ON if fail-safe
control is activated while front wiper motor is operated and wiper stop in the other than
stop position.
Front fog lamp
Front fog lamp relay OFF
Horn
Horn relay OFF
Ignition relay
The status just before activation of fail-safe is maintained.
Starter motor
Starter control relay OFF
Voltage judgment
IPDM E/R judgment
Operation
Ignition relay con-
tact side
Ignition relay exci-
tation coil side
ON
ON
Ignition relay ON normal
—
OFF
OFF
Ignition relay OFF normal
—
ON
OFF
Ignition relay ON stuck
• Detects DTC “B2098: IGN RELAY ON”
• Turns ON the tail lamp relay for 10 minutes
OFF
ON
Ignition relay OFF stuck
Detects DTC “B2099: IGN RELAY OFF”
PCS-8
< SYSTEM DESCRIPTION >
[IPDM E/R]
SYSTEM
NOTE:
This operation status can be confirmed on the IPDM E/R “Data Monitor” that displays “BLOCK” for the item
“WIP PROT” while the wiper is stopped.
STARTER MOTOR PROTECTION FUNCTION
IPDM E/R turns OFF the starter control relay to protect the starter motor when the starter control relay remains
active for 90 seconds.
POWER CONTROL SYSTEM
POWER CONTROL SYSTEM : System Description
INFOID:0000000009652848
SYSTEM DIAGRAM
DESCRIPTION
Alternator Control
IPDM E/R outputs power generation command signal (PWM signal) to the alternator according to the status of
the power generation command value signal received from ECM via CAN communication. Refer to
"CHARGING SYSTEM : System Description"
.
SIGNAL BUFFER SYSTEM
SIGNAL BUFFER SYSTEM : System Description
INFOID:0000000009652849
SYSTEM DIAGRAM
DESCRIPTION
• IPDM E/R reads the status of the oil pressure switch and transmits the oil pressure switch signal to BCM via
CAN communication. Refer to
MWI-16, "OIL PRESSURE WARNING LAMP : System Description"
.
Ignition switch
Front wiper switch
Front wiper stop position signal
ON
OFF
The front wiper stop position signal (stop position) cannot be input for 10 seconds.
ON
The front wiper stop position signal does not change for 10 seconds.
JMMIA0810GB
JMMIA0835GB
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