2004 INFINITI FX35 relay

SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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Revision: 2004 November 2004 FX35/FX45
VOLTAGE CHECK METHOD
To help in understanding the diagnosis of open circuits please refer to the previous schematic.
In any powered circuit, an open can be found by methodically checking the system for the presence of voltage.
This is done by switching the DMM to the voltage function.

Connect one probe of the DMM to a known good ground.

Begin probing at one end of the circuit and work your way to the other end.

With SW1 open, probe at SW1 to check for voltage.
voltage; open is further down the circuit than SW1.
no voltage; open is between fuse block and SW1 (point A).

Close SW1 and probe at relay.
voltage; open is further down the circuit than the relay.
no voltage; open is between SW1 and relay (point B).

Close the relay and probe at the solenoid.
voltage; open is further down the circuit than the solenoid.
no voltage; open is between relay and solenoid (point C).
Any powered circuit can be diagnosed using the approach in the previous example.
Testing for “Shorts” in the Circuit
To simplify the discussion of shorts in the system, please refer to the following schematic.
RESISTANCE CHECK METHOD

Disconnect the battery negative cable and remove the blown fuse.

Disconnect all loads (SW1 open, relay disconnected and solenoid disconnected) powered through the
fuse.

Connect one probe of the DMM to the load side of the fuse terminal. Connect the other probe to a known
good ground.

With SW1 open, check for continuity.
continuity; short is between fuse terminal and SW1 (point A).
no continuity; short is further down the circuit than SW1.

Close SW1 and disconnect the relay. Put probes at the load side of fuse terminal and a known good
ground. Then, check for continuity.
continuity; short is between SW1 and the relay (point B).
no continuity; short is further down the circuit than the relay.

Close SW1 and jump the relay contacts with jumper wire. Put probes at the load side of fuse terminal and
a known good ground. Then, check for continuity.
continuity; short is between relay and solenoid (point C).
no continuity; check solenoid, retrace steps.
VOLTAGE CHECK METHOD

Remove the blown fuse and disconnect all loads (i.e. SW1 open, relay disconnected and solenoid discon-
nected) powered through the fuse.

Turn the ignition key to the ON or START position. Verify battery voltage at the battery + side of the fuse
terminal (one lead on the battery + terminal side of the fuse block and one lead on a known good ground).

With SW1 open and the DMM leads across both fuse terminals, check for voltage.
voltage; short is between fuse block and SW1 (point A).
SGI847-A

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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Revision: 2004 November 2004 FX35/FX45
no voltage; short is further down the circuit than SW1.

With SW1 closed, relay and solenoid disconnected and the DMM leads across both fuse terminals, check
for voltage.
voltage; short is between SW1 and the relay (point B).
no voltage; short is further down the circuit than the relay.

With SW1 closed, relay contacts jumped with fused jumper wire check for voltage.
voltage; short is down the circuit of the relay or between the relay and the disconnected solenoid (point C).
no voltage; retrace steps and check power to fuse block.
Ground Inspection
Ground connections are very important to the proper operation of electrical and electronic circuits. Ground
connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can
become an unwanted resistance. This unwanted resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti-
cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even
when the ground connection looks clean, there can be a thin film of rust on the surface.
When inspecting a ground connection follow these rules:

Remove the ground bolt or screw.

Inspect all mating surfaces for tarnish, dirt, rust, etc.

Clean as required to assure good contact.

Reinstall bolt or screw securely.

Inspect for “add-on” accessories which may be interfering with the ground circuit.

If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the
wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one
eyelet make sure no ground wires have excess wire insulation.
For detailed ground distribution information, refer to “Ground Distribution” in PG section.
Voltage Drop Tests
Voltage drop tests are often used to find components or circuits which have excessive resistance. A voltage
drop in a circuit is caused by a resistance when the circuit is in operation.
Check the wire in the illustration. When measuring resistance with DMM, contact by a single strand of wire will
give reading of 0 ohms. This would indicate a good circuit. When the circuit operates, this single strand of wire
is not able to carry the current. The single strand will have a high resistance to the current. This will be picked
up as a slight voltage drop.
Unwanted resistance can be caused by many situations as follows:

Undersized wiring (single strand example)

Corrosion on switch contacts

Loose wire connections or splices.
SGI853

GW-86
REAR WINDOW DEFOGGER
Revision: 2004 November 2004 FX35/FX45
REAR WINDOW DEFOGGERPFP:25350
Component Parts and Harness Connector LocationAIS004QY
System DescriptionAIS004QZ
The rear window defogger system is controlled by BCM (Body Control Module) and IPDM E/R (Intelligent
Power Distribution Module Engine Room).
The rear window defogger operates only for approximately 15 minutes.
Power is at all times supplied

through 20A fuse [No. 75, and 80, located in the IPDM E/R]

to rear window defogger relay terminals 3 and 6.

through 10A fuse [No.12, located in the fuse block]

to rear window defogger relay terminal 1.

through 15A fuse [No. 32, located in the fuse block (J/B)]
PIIA6408E

REAR WINDOW DEFOGGER
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Revision: 2004 November 2004 FX35/FX45

to A/C and AV switch terminal 1.

through 50A fusible link (letter M , located in the fuse and fusible link box)

to BCM terminal 55.

through 15A fuse [No.22, located in the fuse block (J/B)]

to BCM terminal 42.
With the ignition switch turned to ON or START position,
Power is supplied

through 15A fuse [No.1, located in the fuse block (J/B)]

to BCM terminal 38.
Ground is supplied

to BCM terminal 49 and 52

through body grounds M35, M45 and M85.

to A/C and AV switch terminal 5

through body grounds M35, M45 and M85.

to IPDM E/R terminals 38 and 60

through body grounds E21, E50 and E51.
When rear window defogger switch in A/C and AV switch is turned to ON,
Ground is supplied

to BCM terminal 9

through A/C and AV switch terminal 16

through A/C and AV switch terminal 5

through body grounds M35, M45 and M85.
Then rear window defogger switch is illuminated.
Then BCM recognizes that rear window defogger switch is turned to ON.
Then it sends rear window defogger switch signals to IPDM E/R, display control unit (with navigation system)
or display unit (without navigation system) via DATA LINE (CAN H, CAN L).
When display control unit (with navigation system) or display unit (without navigation system) receives rear
window defogger switch signals, and display on the screen.
When IPDM E/R receives rear window defogger switch signals,
Ground is supplied

to rear window defogger relay terminal 2

through IPDM E/R terminal 52

through IPDM E/R terminals 38 and 60

through body grounds E21, E50 and E51,
and then rear window defogger relay is energized.
When rear window defogger relay is turned ON,
Signals are transmitted,

through rear window defogger relay terminals 5 and 7

to rear window defogger terminal 1

Rear window defogger terminal 2 is grounded through body grounds B15 and B45.
With power and ground supplied, rear window defogger filaments heat and defog the rear window.
When rear window defogger relay is turned to ON,
Power is supplied

through rear window defogger relay terminal 7

through fuse block (J/B) terminal 2C

through 15A fuse [No. 8, located in the fuse block (J/B)]

through fuse block (J/B) terminal 5B

to door mirror defogger (driver side and passenger side) terminal 1.
Door mirror defogger (driver side and passenger side) terminal 2 is grounded through body grounds M35, M45
and M85.
With power and ground supplied, rear window defogger filaments heat and defog the rear window and door
mirror defogger filaments heat and defog the mirror.

GW-94
REAR WINDOW DEFOGGER
Revision: 2004 November 2004 FX35/FX45
Terminal and Reference Value for BCMAIS004R4
Terminal and Reference Value for IPDM E/RAIS004R5
Work FlowAIS004R6
1. Check the symptom and customer's requests.
2. Understand the outline of system. Refer to GW-86, "
System Description" .
3. According to the trouble diagnosis chart, repair or replace the cause of the malfunction. Refer to GW-97,
"Trouble Diagnoses Symptom Chart" .
4. Does rear window defogger operate normally? YES: GO TO 5, NO: GO TO 3.
5. INSPECTION END.
Terminal Wire color Item ConditionVoltage (V)
(Approx.)
9L/WRear window defogger
switch signalWhen rear window defogger switch is pressed. 0
When rear window defogger switch is OFF. 5
38 W/L Ignition switch ON or START Ignition switch (ON or START position) Battery voltage
39 L CAN− H——
40 R CAN− L——
42 L/R Battery power supply — Battery voltage
49 B Ground (signal) — 0
52 B Ground (power) — 0
55 G Battery power supply — Battery voltage
Terminal Wire color Item ConditionVoltage (V)
(Approx.)
5 R Battery power supply — Battery voltage
6 W Battery power supply — Battery voltage
38 B Ground (Power) — 0
48 L CAN− H——
49 R CAN− L——
52 GRear window defogger relay
control signalWhen rear window defogger switch is ON. 0
When rear window defogger switch is OFF. Battery voltage
60 B Ground (Signal) — 0

GW-96
REAR WINDOW DEFOGGER
Revision: 2004 November 2004 FX35/FX45
7. Select diagnosis mode,“DATA MONITOR” and “ACTIVE TEST”
are available.
DATA MONITOR
Display Item List
ACTIVE TEST
Display Item List
SEL322W
Monitor item Content
REAR DEF SW Displays “Press (ON)/others (OFF)” status determined with the rear window defogger switch.
IGN ON SW Displays “IGN (ON)/OFF” status determined with the ignition switch signal.
Test item Content
REAR DEFOGGER Gives a drive signal to the rear window defogger relay to activate it.

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REAR WINDOW DEFOGGER
Revision: 2004 November 2004 FX35/FX45
Rear Window Defogger Power Supply Circuit CheckAIS004RB
1. CHECK FUSE

Check 10A fuse [No.12, located in fuse block (J/B)]

Check 20A fuse (No.75, located in the IPDM E/R)

Check 20A fuse (No.80, located in the IPDM E/R)
NOTE:
Refer to GW-86, "
Component Parts and Harness Connector Location" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown out, be sure to eliminate cause of malfunction before installing new fuse, refer to
PG-3, "
POWER SUPPLY ROUTING CIRCUIT" .
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Remove rear window defogger relay.
3. Turn ignition switch ON.
4. Check voltage between rear window defogger relay connector
and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness between fuse block (J/B) and
rear window defogger relay.
3. CHECK REAR WINDOW DEFOGGER RELAY
Check continuity between rear window defogger terminals 3 and 5, 6
and 7.
OK or NG
OK >> GO TO 4.
NG >> Replace rear window defogger relay.
ConnectorTerminals (Wire color)
Voltage (V)
(Approx.)
(+) (-)
E131 (OR)
Ground Battery voltage 3 (W)
6 (R)
PIIA4233E
Terminal Condition Continuity
3512V direct current supply
between terminals 1 and 2Ye s
No current supply No
6712V direct current supply
between terminals 1 and 2Ye s
No current supply No
SEC202B

REAR WINDOW DEFOGGER
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4. CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Installation rear window defogger relay.
3. Turn ignition switch ON.
4. Check voltage between IPDM E/R connector and ground.
OK or NG
OK >> Rear window defogger power supply circuit is OK.
NG >> GO TO 5.
5. CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and rear window defogger relay.
3. Check continuity between IPDM E/R connector E9 terminal 52
and rear window defogger relay connector E13 terminal 2.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace harness between IPDM E/R and rear
window defogger relay.
6. CHECK REAR WINDOW DEFOGGER RELAY OUTPUT SIGNAL
1. Connect IPDM E/R and rear window defogger relay.
2. Turn ignition switch ON.
3. Check voltage between IPDM E/R connector E9 terminal 52 and
ground.
OK or NG
OK >> Check condition of harness and connector.
NG >> Replace IPDM E/R.
ConnectorTerminals (Wire color)
ConditionVoltage (V)
(Approx.)
(+) (-)
E9 52 (G) GroundWhen rear window defog-
ger switch ON0
When rear window defog-
ger switch OFFBattery
voltage
PIIA6210E
52 (G) – 2 (G) : Continuity should exist.
PIIA6211E
52 (G) – Ground : Battery voltage
PIIA6210E