2004 INFINITI FX35 Lock

BACK DOOR AUTO CLOSURE SYSTEM
BL-169
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Revision: 2004 November 2004 FX35/FX45
Terminals and Reference Value for Back Door Closure Control UnitAIS004OG
*, (): Models with Intelligent KeyTe r m i -
nalWire
colorItem ConditionVoltage (V)
(Approx.)
1 R Battery power supply — Battery voltage
2 PU Closure motor (open) signal Fully close → fully open
3 G Closure motor (close) signal Fully open → fully close
4 B Ground — 0
5W
(B)Ground* — 0*
Unlock sensor signal
(passenger side)Passenger side door lock is locked 5
Passenger side door lock is unlocked 0
6Y
(LG)Back door opener switch signalBack door opener switch is ON 0
Other than above 5
7 OR Half-latch switch signal Fully open → fully close
8 L Close switch signal Fully open → fully close
9 P Open switch signal Fully open → fully close
SIIA1480J
SIIA1480J
SIIA1479J
SIIA1478J
SIIA1481J

BL-170
BACK DOOR AUTO CLOSURE SYSTEM
Revision: 2004 November 2004 FX35/FX45
Work FlowAIS004OH
1. Check the symptom and customer's requests.
2. Understand the outline of system. Refer to BL-165, "
System Description" .
3. Perform the preliminary check, Refer to BL-170, "
Preliminary Check"
4. According to the trouble diagnosis chart, repair or replace the cause of the malfunction. Refer to BL-170,
"Trouble Diagnosis Chart by Symptom" .
5. Does back door auto closure system operate normally? If Yes, GO TO 6, If No, GO TO 4.
6. INSPECTION END
Preliminary CheckAIS004OI
Remove the fuse No.18 for the back door closure with the back door closure inactive.
Check that the back door can be open / close normally.
CAUTION:
It is judged it is abnormal, discontinues closure operation, and drive lever returns to a neutral position
if not becoming full-latch within about three seconds after half-latch.
When this operation is done continuously three times, both back door closure and back door opener
switch are not operated because the function of back door closure is stopped.
Thing to reset power supply by pulling out and opening fuse in that case.
Trouble Diagnosis Chart by SymptomAIS004OJ
Symptom Diagnostic procedure and repair order Refer to page
Back door closure does not operate.1.Back door closure motor power supply and ground
circuit check BL-171
2. Half-latch switch checkBL-171
3. Close switch checkBL-173
4. Open switch check.BL-174
5. Closure motor check.BL-180
6. Replace back door closure control unit.BL-180
Back door does not open (with Intelligent Key system).1. Intelligent Key system check.BL-1132. Back door opener switch check.BL-175
Back door does not open1. Back door opener switch check.BL-1772. Unlock sensor check.BL-179
3. Replace back door closure control unit.BL-180
Back door does not enter fully closed states through
back door closure operates.1.Back door fitting adjustment.BL-159
2. Replace back door lock assembly.BL-163

BACK DOOR AUTO CLOSURE SYSTEM
BL-171
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Revision: 2004 November 2004 FX35/FX45
Back Door Closure Control Unit Power Supply and Ground Circuit CheckAIS004OK
1. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Check voltage between back door closure control unit connector
D106 terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> Check the following.

15A fuse [No.18, located in fuse block (J/B)]

Harness for open or short between back door closure
control unit and fuse.
2. CHECK GROUND CIRCUIT
1. Disconnect back door closure control unit connector.
2. Check continuity between back door closure control unit con-
nector D106 terminal 4 and ground.
OK or NG
OK >> Power supply and ground circuit are OK.
NG >> Repair or replace harness.
Half-Latch Switch CheckAIS004OL
1. CHECK HALF-LATCH SWITCH SIGNAL
1. Turn ignition switch OFF.
2. Check the signal between back door closure control unit connector and ground with oscilloscope.
OK or NG
OK >> Half-latch switch is OK.
NG >> GO TO 2.1 (R) – Ground : Battery voltage
PIIA6166E
4 (B) – Ground : Continuity should exist.
PIIA6167E
Con-
nectorTerminals (Wire color)
Back door
conditionSignal
(Reference value)
(+) (-)
D106 7 (OR) GroundFully open →
fully closed
PIIA6168E
SIIA1479J

BL-172
BACK DOOR AUTO CLOSURE SYSTEM
Revision: 2004 November 2004 FX35/FX45
2. CHECK HARNESS CONTINUITY
1. Disconnect back door closure control unit and back door closure motor connector.
2. Check continuity between back door closure control unit con-
nector D106 terminal 7 and back door closure motor connector
D109 terminal 6.
3. Check continuity between back door closure control unit con-
nector D106 terminal 7 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
Check continuity between back door closure motor connector D109
terminal 8 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness.
4. CHECK BACK DOOR CLOSURE CONTROL UNIT OUTPUT SIGNAL
1. Connect back door closure control unit connector.
2. Check voltage between back door closure control unit connector
D106 terminal 7 and ground.
OK or NG
OK >> Replace back door lock assembly.
NG >> Replace back door closure control unit.7 (OR) – 6 (OR) : Continuity should exist.
7 (OR) – Ground : Continuity should not exist.
PIIA6169E
8 (B) – Ground : Continuity should exist.
PIIA6170E
Back door is closed
7 (OR) – Ground : Battery voltage
PIIA6172E

BL-174
BACK DOOR AUTO CLOSURE SYSTEM
Revision: 2004 November 2004 FX35/FX45
4. CHECK BACK DOOR CLOSURE CONTROL UNIT OUTPUT SIGNAL
1. Connect back door closure control unit connector.
2. Check voltage between back door closure control unit connector
D106 terminal 8 and ground.
OK or NG
OK >> Replace back door lock assembly.
NG >> Replace back door closure control unit.
Open Switch CheckAIS004ON
1. CHECK OPEN SWITCH SIGNAL
1. Turn ignition switch OFF.
2. Check the signal between back door closure control unit connector and ground with oscilloscope.
OK or NG
OK >> Open switch is OK.
NG >> GO TO 2.
2. CHECK HARNESS CONTINUITY
1. Disconnect back door closure control unit and back door closure motor connector.
2. Check continuity between back door closure control unit con-
nector D106 terminal 9 and back door closure motor connector
D109 terminal 4.
3. Check continuity between back door closure control unit con-
nector D106 terminal 9 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.Back door is closed
8 (L) – Ground : Battery voltage
PIIA6173E
Con-
nectorTerminals (Wire color)
Back door
conditionSignal
(Reference value)
(+) (-)
D106 9 (P) GroundFully open →
fully closed
PIIA6175E
SIIA1481J
9 (P) – 4 (P) : Continuity should exist.
9 (P) – Ground : Continuity should not exist.
PIIA6176E

BACK DOOR AUTO CLOSURE SYSTEM
BL-175
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Revision: 2004 November 2004 FX35/FX45
3. CHECK GROUND CIRCUIT
Check continuity between back door closure motor connector D109
terminal 8 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness.
4. CHECK BACK DOOR CLOSURE CONTROL UNIT OUTPUT SIGNAL
1. Connect back door closure control unit connector.
2. Check voltage between back door closure control unit connector
D106 terminal 9 and ground.
OK or NG
OK >> Replace back door lock assembly.
NG >> Replace back door closure control unit.
Back Door Opener Switch Check (With Intelligent Key)AIS004U8
1. CHECK BACK DOOR OPENER SWITCH SIGNAL
1. Turn ignition switch OFF.
2. Check voltage between back door closure control unit connector and ground.
OK or NG
OK >> Back door opener switch is OK.
NG >> GO TO 2.8 (B) – Ground : Continuity should exist.
PIIA6170E
Back door is closed
9 (P) – Ground : Battery voltage
PIIA6177E
ConnectorTerminals (Wire color)
ConditionVoltage (V)
(Approx.)
(+) (-)
D106 6 (LG) GroundBack door opener switch
: ON0
Back door opener switch
: OFF5
PIIA6178E

BACK DOOR AUTO CLOSURE SYSTEM
BL-179
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Revision: 2004 November 2004 FX35/FX45
Unlock Sensor Check (Without Intelligent Key)AIS004UA
1. CHECK UNLOCK SENSOR SIGNAL
1. Turn ignition switch OFF.
2. Check voltage between back door closure control unit connector
and ground.
OK or NG
OK >> Unlock sensor is OK.
NG >> GO TO 2.
2. CHECK HARNESS CONTINUITY
1. Disconnect back door closure control unit and front door lock assembly (passenger side) connector.
2. Check continuity between back door closure control unit con-
nector D106 terminal 5 and front door lock assembly (passenger
side) connector D40 terminal 5.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness between back door closure
control unit and front door lock assembly (passenger
side).
3. CHECK GROUND CIRCUIT
Check continuity between front door lock assembly (passenger side)
connector D40 terminal 4 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness.
ConnectorTerminals (Wire color)
ConditionVoltage (V)
(Approx.)
(+) (-)
D106 5 (W) GroundPassenger side door lock is
locked5
Passenger side door lock is
unlocked0
PIIA6182E
5 (W) – 5 (W) : Continuity should exist.
PIIA6183E
4 (B) – Ground : Continuity should exist.
PIIA6184E

BL-180
BACK DOOR AUTO CLOSURE SYSTEM
Revision: 2004 November 2004 FX35/FX45
4. CHECK BACK DOOR CLOSURE CONTROL UNIT OUTPUT SIGNAL
1. Connect back door closure control unit connector.
2. Check voltage between back door closure control unit connector
D106 terminal 5 and ground.
OK or NG
OK >> Replace front door lock assembly (passenger side).
NG >> Replace back door closure control unit.
Closure Motor CheckAIS004UB
1. CHECK BACK DOOR CLOSURE MOTOR
1. Turn ignition switch OFF.
2. Check the signal between back door closure control unit connector and ground with oscilloscope.
OK or NG
OK >> GO TO 2.
NG >> Replace back door closure control unit.
2. CHECK HARNESS CONTINUITY
1. Disconnect back door closure control unit and back door closure motor connector.
2. Check continuity between back door closure control unit con-
nector D106 terminals 2, 3 and back door closure motor connec-
tor D109 terminals 1, 2.
3. Check continuity between back door closure control unit con-
nector D106 terminals 2, 3 and ground.
OK or NG
OK >> Replace back door closure motor.
NG >> Repair or replace harness.
Removal and Installation of Back Door Closer Control UnitAIS004UC
1. Remove the back door finisher.EI-46, "Removal and Installation" .
2. Disconnect the back door closer control unit harness, remove the screw and back door closer control unit.5 (W) – Ground : Approx. 5V
PIIA6182E
Con-
nectorTerminals (Wire color)
Back door
conditionSignal
(Reference value)
(+) (-)
D1062 (PU)
GroundFully closed
→ fully open
3 (G)Fully open →
fully closed
PIIA6185E
SIIA1480J
2 (PU) – 1 (PU) : Continuity should exist.
3 (G) – 2 (G) : Continuity should exist.
2 (PU) – Ground : Continuity should not exist.
3 (G) – Ground : Continuity should not exist.
PIIA6186E