control unit INFINITI M35 2007 Factory Service Manual

SE-86
AUTOMATIC DRIVE POSITIONER
Revision: 2007 April2007 M35/M45
Check A/T Device (Detention Switch) Circuit NIS0026V
1. CHECK FUNCTION
With CONSULT-II
Check that when the A/T selector lever is in P position, “DETENT
SW” on the DATA MONITOR becomes OFF.
Without CONSULT-II
1. Turn ignition switch OFF.
2. Check voltage between driver seat control unit connector and
ground.
OK or NG
OK >> A/T device (detention switch) circuit is OK.
NG >> GO TO 2.
2. CHECK A/T DEVICE (PARK POSITION SWITCH) HARNESS
1. Turn ignition switch OFF.
2. Disconnect A/T device and driver seat control unit connector.
3. Check continuity between A/T device connector and driver seat
control unit connector.
4. Check continuity between driver seat control unit connector and
ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
Monitor item
[OPERATION or UNIT]Contents
Detention SW“ON/
OFF”The selector lever position “P position (OFF)/other than P
position (ON)” judged from the detention switch signal is
displayed.
PIIB6293E
Driver seat
control unit
connectorTerminal
Condition of A/T
selector leverVoltage (V)
(Approx.)
(+) (–)
M204 21 GroundP position 0
Other than above Battery voltage
PIIB6198E
AB
Continuity
Driver seat control
unit connectorTe r m i n a lA/T device
connectorTerminal
M204 21 M133 10 Yes
Driver seat control unit
connectorTerminal
GroundContinuity
M204 21 No
PIIB6199E

SE-88
AUTOMATIC DRIVE POSITIONER
Revision: 2007 April2007 M35/M45
3. CHECK DOOR SWITCH
Check continuity door switch (driver side).
OK or NG
OK >> GO TO 4.
NG >> Replace door switch (driver side).
4. CHECK BCM OUTPUT SIGNAL
1. Connect BCM connector.
2. Check voltage between BCM connector ground.
OK or NG
OK >> Check the condition of the harness and the connector.
NG >> Replace BCM.
Check UART Communication Line Circuit NIS0026X
1. CHECK UART LINE HARNESS
1. Turn ignition switch OFF.
2. Disconnect driver seat control unit and automatic drive posi-
tioner control unit connector.
3. Check continuity between driver seat control unit connector and
automatic drive positioner connector.
4. Check continuity between driver seat control unit connector and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace harness.
Terminal
Door switch Continuity
Door switch
2Ground part of
door switchPushed No
Released Yes
PIIB5977E
Terminal
Voltage (V)
(Approx.) (+)
(–)
BCM connector Terminal
M3 62 Ground Battery voltage
PIIB6295E
AB
Continuity
Driver seat control
unit connectorTe r m i n a lAutomatic drive
positioner control
unit connectorTerminal
B2041
M610
Ye s
17 26
A
GroundContinuity
Driver seat control unit
connectorTerminal
B2041
No
17
PIIB6201E

AUTOMATIC DRIVE POSITIONER
SE-89
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D
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F
G
H
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B
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Revision: 2007 April2007 M35/M45
2. CHECK UART LINE INPUT/OUTPUT SIGNAL 1
1. Connect driver seat control unit and automatic drive positioner control unit connector.
2. Turn ignition switch ON.
3. Check signal between driver seat control unit connector and
ground, with oscilloscope.
OK or NG
OK >> GO TO 3.
NG >> Check the following.

When voltage wave form does not appear with a constant voltage (approx. 5V), replace driver
seat control unit.

When voltage wave form does not appear with a constant voltage (approx. 0V), replace auto-
matic drive positioner control unit.
3. CHECK UART LINE INPUT/OUTPUT SIGNAL 2
Check signal between automatic drive positioner control unit con-
nector and ground, with oscilloscope.
OK or NG
OK >> GO TO 4.
NG >> Check the following.

When voltage wave form does not appear with a constant voltage (approx. 5V), replace auto-
matic drive positioner control unit.

When voltage wave form does not appear with a constant voltage (approx. 0V), replace driver
seat control unit.
4. CHECK DRIVER SEAT CONTROL UNIT
Does the automatic drive positioner operate when the driver seat control unit is exchanged?
Driver seat
control
unit
connectorTe r m i n a l s
ConditionSignal
(Reference value)
(+) (–)
B204 17 GroundTilt switch
operated
PIIB6202E
SKIA0175E
Automatic
drive posi-
tioner con-
trol unit
connectorTe r m i n a l s
ConditionSignal
(Reference value)
(+) (–)
M6 10 GroundTilt switch
operated.
PIIB6203E
SKIA0175E

SE-90
AUTOMATIC DRIVE POSITIONER
Revision: 2007 April2007 M35/M45
OK or NG
OK >> Replace driver seat control unit.
NG >> Replace automatic drive positioner control unit.
Check Lumbar Support Circuit NIS0026Y
1. CHECK LUMBAR SUPPORT SWITCH
1. Turn ignition switch OFF.
2. Disconnect lumbar support switch connector.
3. Check voltage between lumbar support switch connector and
ground.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace harness between fuse block (J/B) and
lumbar support switch.
2. CHECK LUMBAR SUPPORT SWITCH
Check continuity lumbar support switch connector.
OK or NG
OK >> GO TO 3.
NG >> Replace lumbar support switch.
Terminals
Voltage (V)
(Approx.) (+)
(–)
Lumbar support
switch connectorTerminal
B212 55 Ground Battery voltage
PIIB6204E
Lumbar
support switchTerminalCondition of
lumbar support switchContinuity
B2125557FORWARD Yes
Other than above No
58BACKWARD Yes
Other than above No
5657FORWARD No
Other than above Yes
58BACKWARD No
Other than above Yes
PIIB6205E

SE-96
POWER SEAT(REAR)
Revision: 2007 April2007 M35/M45
POWER SEAT(REAR)PFP:88010
Component Parts and Harness Connector LocationNIS00272
System DescriptionNIS00273
The rear power seat (LH / RH) retreats when the auto return cancel switch is turned on and each door is
opened.
When the rear power seat switch turned on, or auto return cancel switch is canceled, an auto return is discon-
tinued.
Power is all time supplied

through 50A fusible link [letter F, located in the fuse block (J/B)],

to rear LH seat control unit, rear RH seat control unit terminal 1.
REAR POWER SEAT LH AND RH OPERATION
When rear power seat switch is forward, ground is supplied

to rear seat control unit terminal 10,

through rear power seat switch terminal 2,

through rear power seat switch terminal 3,

through body grounds B5, B40, B131.
When rear seat control unit receives power seat switch forward signal, power is supplied

through rear seat control unit terminal 2,

to rear seat sliding motor terminal 3.
PIIB5889E
1.Fuse, fusible link and relay block
(J/B)2.a: Rear power seat switch LH B504
b: Automatic return cancel switch
B508
c: Rear power seat switch RH B5553.Rear seat control unit
B303, B304 (LH) B353, B354 (RH)
(View with the rear seatback
removed)
4.Rear seat sliding motor
B311 (LH), B361 (RH)
(View with the rear seat cushion
removed)5.Rear door switch
B53 (LH), B403 (RH)

POWER SEAT(REAR)
SE-97
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B
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Revision: 2007 April2007 M35/M45
Then ground is supplied

through rear seat sliding motor terminals 5,

through body grounds B5, B40, B131.
When power and ground are supplied, rear power seat slide moves forward.
When rear power seat switch is backward, ground is supplied

to rear seat control unit terminal 15,

through rear power seat switch terminal 1,

through rear power seat switch terminal 3,

through body grounds B5, B40, B131.
When rear seat control unit receives power seat switch backward signal, power is supplied

to rear seat control unit terminal 7,

through rear seat sliding motor terminal 4.
Then ground is supplied

through rear seat sliding motor terminals 5,

through body grounds B5, B40, B131.
When power and ground are supplied, rear power seat slide moves backward.
REAR SEAT RETREAT FUNCTION
When rear door open, ground is supplied

to rear seat control unit terminal 16,

through rear door switch terminal 2,
When rear seat control unit receives automatic return cancel switch ON and rear door switch open signal,
power is supplied

through rear seat control unit terminal 7,

to rear seat sliding motor terminal 4.
Then ground is supplied

through rear seat sliding motor terminals 5,

through body grounds B5, B40, B131.
When power and ground are supplied, rear power seat slide moves backward.
When rear seat sliding motor is operated, ground is supplied

to rear seat control unit terminal 12,

through rear seat sliding motor terminal 1,

through rear seat sliding motor terminal 2,

through rear seat control unit terminal 19,

through rear seat control unit terminals 13,

through body grounds B5, B40, B131.
Then rear seat control unit receives rear power seat sliding sensor signal.
The rear power seat control unit controls the seat position of the system operation with the signal.

POWER SEAT(REAR)
SE-103
C
D
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F
G
H
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MA
B
SE
Revision: 2007 April2007 M35/M45
Terminals and Reference Values for Rear Seat Control Unit NIS00276
Te r m i -
nalWire
ColorItemSignal
Input/OutputConditionVoltage (V)
(Approx.)
1 R Power source (BAT) Input — Battery voltage
2 R/W Sliding motor forward signal OutputWhen sliding switch forward is
operatedBattery voltage
Other than above 0
7 W/R Sliding motor backward signal OutputWhen sliding switch backward
is operatedBattery voltage
Other than above 0
8 B/L Ground (power) — — 0
10 Y/B Sliding switch forward signal InputWhen sliding switch forward is
operated0
Other than above. Battery voltage
11 Y/R Cancel switch signal InputCancel switch ON 5
Cancel switch CANCEL 0
12 Y/GSliding sensor signal
InputSliding device active
Sliding device inactive 0 or 5
13 B/Y Ground (signal) — — 0
15 L/R Sliding switch backward signal InputWhen sliding switch backward
is operated0
Other than above Battery voltage
16 L/B Rear door switch signal InputRear door open (ON) 0
Rear door close (OFF) Battery voltage
19 Y Sensor ground — — 0
SIIA0690J

SE-104
POWER SEAT(REAR)
Revision: 2007 April2007 M35/M45
Work FlowNIS00277
1. Check the symptom and customer's requests.
2. Understand the outline of system. Refer to SE-96, "
System Description" .
3. According to the trouble diagnosis chart, repair or replace the cause of the malfunction. Refer to SE-104,
"Trouble Diagnoses Symptom Chart" .
4. Does rear power seat operate normally? YES: GO TO 5, NO: GO TO 4.
5. INSPECTION END.
Trouble Diagnoses Symptom ChartNIS00278

Check that other systems using the signal of the following systems operate normally.
Check Rear Power Seat Power Supply CircuitNIS00279
1. CHECK FUSIBLE LINK
Check 50A fusible link (letter F located in the fuse and fusible link box).
NOTE:
Refer to SE-96, "
Component Parts and Harness Connector Location" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to PG-
3, "POWER SUPPLY ROUTING CIRCUIT" .
2. CHECK CIRCUIT BREAKER
Check circuit breaker.
NOTE:
Refer to PG-3, "
POWER SUPPLY ROUTING CIRCUIT" .
OK or NG
OK >> Check the condition of the harness and connector.
NG >> Replace the circuit breaker.
Symptom Diagnoses / service procedure Refer to page
Rear power seat LH, RH do not operate. Check rear power seat power supply circuitSE-104
Rear power seat LH or RH sliding switch does not operate moreover,
retreat function does not operate if the door is opened1. Check rear seat control unit power supply
and ground circuit SE-105
2. Check rear seat sliding motor circuit SE-106
Rear power seat LH or RH does not operate, but retreat function
operates when the door is openedCheck rear power seat switch circuitSE-107
Rear power seat LH and RH retreat function does not operate,
but operates by sliding switchCheck automatic return cancel switchSE-110
Rear power seat LH or RH retreat function does not operate,
but operates by a sliding switch1. Check rear door switch circuitSE-1112. Check automatic return cancel switch circuit SE-109
3. Check rear seat sliding sensor circuitSE-112

POWER SEAT(REAR)
SE-105
C
D
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F
G
H
J
K
L
MA
B
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Revision: 2007 April2007 M35/M45
Check Rear Seat Control Unit Power Supply and Ground CircuitNIS0027A
1. CHECK REAR SEAT CONTROL UNIT POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Check voltage between rear seat control unit connector and
ground.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace harness between circuit breaker and rear seat control unit.
2. CHECK REAR POWER SEAT CONTROL UNIT GROUND CIRCUIT
1. Disconnect rear seat control unit connector.
2. Check continuity between rear seat control unit connector and
ground.
OK or NG
OK >> Rear seat control unit power supply and ground circuit is OK.
NG >> Repair or replace harness between rear seat control unit and ground.
Terminal
Voltage (V)
(Approx.) (+)
(–)
Rear seat control
unit connectorTerminal
B303 (LH)
B353 (RH)1 Ground Battery voltage
PIIB5917E
Terminal
Continuity
Rear seat control
unit connectorTerminal
Ground B303 (LH)
B353 (RH)8
Ye s
B304 (LH)
B354 (RH)13
PIIB5918E

SE-106
POWER SEAT(REAR)
Revision: 2007 April2007 M35/M45
Check Rear Seat Sliding Motor CircuitNIS0027B
1. CHECK REAR SEAT SLIDING MOTOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Check voltage between rear seat control unit connector and
ground.
OK or NG
OK >> GO TO 2.
NG >> Replace rear seat control unit.
2. CHECK REAR SEAT SLIDING MOTOR HARNESS
1. Disconnect rear seat control unit and rear seat sliding motor connector.
2. Check continuity between rear seat control unit connector and
rear seat sliding motor connector.
3. Check continuity between rear seat control unit connector and
ground.
OK or NG
OK >> Replace rear seat sliding motor.
NG >> Repair or replace harness between rear seat control unit and rear seat sliding motor.
Terminal
ConditionVoltage (V)
(Approx.) (+)
(–) Rear seat
control unit
connectorTerminal
B303 (LH)
B353 (RH)2
GroundRear power
seat switch Forward Battery voltage
Other than above. 0
7Rear power
seat switch Backward Battery voltage
Other than above. 0
PIIB5919E
AB
Continuity
Rear seat control
unit connectorTe r m i n a lRear seat sliding
motor connectorTerminal
B303 (LH)
B353 (RH)2
B311 (LH)
B361 (RH)3
Ye s
74
A
GroundContinuity
Rear seat control unit connector Terminal
B303 (LH)
B353 (RH)2
No
7
PIIB5920E