bcm INFINITI FX35 2004 Service Manual

FRONT WIPER AND WASHER SYSTEM
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Revision: 2004 November 2004 FX35/FX45

to front wiper high relay [located in IPDM E/R (intelligent power distribution module engine room)]

through 10 A fuse [No. 84, located in IPDM E/R (intelligent power distribution module engine room)]

through IPDM E/R (intelligent power distribution module engine room) terminal 44

to front washer motor terminal 1.
Ground is supplied

to BCM terminals 49 and 52

through grounds M35, M45 and M85

to IPDM E/R terminals 38 and 60

through grounds E21, E50 and E51

to combination switch (wiper switch) terminal 12

through grounds M35, M45 and M85.
LOW SPEED WIPER OPERATION
When wiper switch is in LO position, BCM detects low speed wiper ON signal by BCM wiper switch reading
function.
BCM sends front wiper request signal (LO) with CAN communication line

from BCM terminals 39 and 40

to IPDM E/R terminals 48 and 49.
When IPDM E/R receives front wiper request signal (LO), it turns ON front wiper relay (located in IPDM E/R),
power is supplied

to front wiper motor terminal 1

through IPDM E/R terminal 21 and front wiper relay and front wiper HI relay.
Ground is supplied

to front wiper motor terminal 2

through grounds E21, E50 and E51.
With power and ground supplied, the front wiper motor operates at low speed.
HI SPEED WIPER OPERATION
When wiper switch is in HI position, BCM detects high speed wiper ON signal by BCM wiper switch reading
function.
BCM sends front wiper request signal (HI) with CAN communication line

from BCM terminals 39 and 40

to IPDM E/R terminals 48 and 49.
When IPDM E/R receives front wiper request signal (HI), it turns ON front wiper relay (located in IPDM E/R),
power is supplied

to front wiper motor terminal 4

through IPDM E/R terminal 31 and front wiper relay and front wiper HI relay.
Ground is supplied

to front wiper motor terminal 2

through grounds E21, E50 and E51.
With power and ground supplied, the front wiper motor operates at high speed.
INTERMITTENT OPERATION
Wiper intermittent operation delay interval is determined from a combination of 3 switches (intermittent opera-
tion dial position 1, intermittent operation dial position 2, and intermittent operation dial position 3) and vehicle
speed signal.
During each intermittent operation delay interval, BCM sends front wiper request signal to IPDM E/R.

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Wiper Dial Position Setting
Example: For wiper dial position 1...
Using combination switch reading function, BCM detects ON/OFF status of intermittent operation dial posi-
tions 1, 2, and 3.
When combination switch status is as listed below, BCM determines that it is wiper dial position 1.

Intermittent operation dial position 1: ON (Combination switch output 3 and input 1 are performing.)

Intermittent operation dial position 2: ON (Combination switch output 5 and input 1 are performing.)

Intermittent operation dial position 3: ON (Combination switch output 4 and output 2 are performing.)
BCM determines front wiper intermittent operation delay interval from wiper dial position 1 and vehicle speed,
and sends wiper request signal (INT) to IPDM E/R.
AUTO STOP OPERATION
With wiper switch turned OFF, wiper motor will continue to operate until wiper arms reach windshield base.
When wiper arms are not located at base of windshield with wiper switch OFF, ground is provided

from IPDM E/R terminal 21

to front wiper motor terminal 1, in order to continue wiper motor operation at low speed.
When wiper arms reach base of windshield, front wiper motor terminals 5 and 2 are connected,
and Ground is supplied

to IPDM E/R terminal 32

through front wiper motor terminals 5 and 2

through grounds E21, E50 and E51.
Then the IPDM E/R sends auto stop operation signal to BCM with CAN communication line.
When BCM receives auto-stop operation signal, BCM sends wiper stop signal to IPDM E/R with CAN commu-
nication line.
IPDM E/R stops wiper motor. Wiper motor will then stop wiper arms at the STOP position.
WASHER OPERATION
When wiper switch is in front wiper washer position with ignition switch on, BCM detects front wiper switch is
on the washer position by BCM wiper switch reading function (Refer to BCS-3, "
COMBINATION SWITCH
READING FUNCTION" ), combination switch (wiper switch) ground is supplied

to front washer motor terminal 2

through combination switch (wiper switch) terminal 11

to combination switch (wiper switch) terminal 12

through grounds M35, M45 and M85.
With ground supplied, front washer motor is operated.
When BCM detects that front washer motor has operated for 0.4 seconds or linger, BCM operates front wiper
motor for low speed.
When BCM detects washer switch is OFF, low speed operation cycles approximately 3 times and stops.
MIST OPERATION
When the wiper switch is turned to the MIST position, wiper low speed operation cycles once and then stops.
For additional information about wiper operation under this condition, refer to WW-5, "
LOW SPEED WIPER
OPERATION" .
If the switch is held in the MIST position, low speed operation continues.
Wiper dial positionIntermittent operation
intervalCombination switch
Intermittent operation
dial position 1Intermittent operation
dial position 2Intermittent operation
dial position 3
Wiper dial position 1
Small
↓
LargeON ON ON
Wiper dial position 2 ON ON OFF
Wiper dial position 3 ON OFF OFF
Wiper dial position 4 OFF OFF OFF
Wiper dial position 5 OFF OFF ON
Wiper dial position 6 OFF ON ON
Wiper dial position 7 OFF ON OFF

FRONT WIPER AND WASHER SYSTEM
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FAIL-SAFE FUNCTION
IPDM E/R includes a fail-safe function to prevent malfunction of electrical components controlled by CAN com-
munications in CAN communications occurs.
When fail-safe status is initiated, IPDM E/R remains in steady unit signals are received.
COMBINATION SWITCH READING FUNCTION
Description

BCM reads combination switch (wiper) status, and controls related systems such as head lamps and wip-
ers, according to the results.

BCM reads information of a maximum of 20 switches by combining five output terminals (OUTPUT 1-5)
and five input terminals (INPUT 1-5).
Operation Description

BCM activates transistors of output terminals (OUTPUT 1-5) periodically and, and allows current to flow in
turn.

If any (1 or more) switches are turned ON, circuit of output terminals (OUTPUT 1-5) and input terminals
(INPUT 1-5) becomes active.

At this time, transistors of output terminals (OUTPUT 1-5) are activated to allow current to flow. When volt-
age of input terminals (INPUT 1-5) corresponding to that switch changes, interface in BCM detects volt-
age change, and BCM determines that switch is ON.
SKIA4958E

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BCM - Operation Table of Combination Switches

BCM reads operation status of combination switch using combinations shown in table below.
Sample Operation: (When Wiper Switch Turned ON)

When wiper switch is turned ON, contact in combination switch turns ON. At this time if OUTPUT 1 tran-
sistor is activated, BCM detects that voltage changes in INPUT 3.

When OUTPUT 1 transistor is ON, BCM detects that voltage changes in INPUT 3, and judges that front
wiper low is ON. Then BCM sends front wiper request signal (LO) to IPDM E/R using CAN communica-
tion.

When OUTPUT 1 transistor is activated again, BCM detects that voltage changes in INPUT 3, and recog-
nizes that wiper switch is continuously ON.
SKIA4959E
SKIA5290E

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NOTE:
Each OUTPUT terminal transistor is activated at 10 ms intervals. Therefore after switch is turned ON, electri-
cal loads are activated with time delay. But this time delay is so short that it cannot be detected by human
senses.
Operation Mode
Combination switch reading function has operation modes shown below.
1. Normal status
–When BCM is not in sleep status, OUTPUT terminals (1-5) each turn ON-OFF every 10 ms.
2. Sleep status
–When BCM is in sleep status, transistors of OUTPUT (1 and 5) stop the output, and BCM enters low cur-
rent consumption mode. OUTPUT (2, 3, and 4) turn ON-OFF every 10 ms, and only input from light switch
system is accepted.
CAN Communication System DescriptionAKS0056Q
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-board multi-
plex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication UnitAKS0080E
Refer to LAN-6, "CAN Communication Unit" .
SKIA4961E

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Terminals and Reference Values for BCMAKS0056U
Terminal No.
(Wire color)Signal nameMeasuring condition
Reference value
Ignition
switchOperation or condition
2 (GY) Combination switch input 5 ON

Lighting switch and wiper switch
OFF

Wiper dial position 4
3 (L/B) Combination switch input 4 ON

Lighting switch and wiper switch
OFF

Wiper dial position 4
4 (PU/W) Combination switch input 3 ON

Lighting switch and wiper switch
OFF

Wiper dial position 4
5 (Y/R) Combination switch input 2 ON

Lighting switch and wiper switch
OFF

Wiper dial position 4 6 (SB) Combination switch input 1 ON
32 (GY/R) Combination switch output 5 ON

Lighting switch and wiper switch
OFF

Wiper dial position 4
33 (G) Combination switch output 4 ON

Lighting switch and wiper switch
OFF

Wiper dial position 4
34 (W/B) Combination switch output 3 ON

Lighting switch and wiper switch
OFF

Wiper dial position 4
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E

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Preliminary CheckAKS0056X
CHECK POWER SUPPLY AND GROUND CIRCUIT
Inspection Procedure
1. CHECK FUSE

Check if wiper and washer fuse is blown.
Refer to WW-11, "Wiring Diagram — WIPER —" .
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 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check voltage between BCM harness connector terminal and
ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open or short between fuse, fusible link and BCM.
3. CHECK GROUND CIRCUIT
Check continuity between BCM harness connector M4 terminals 49
(B), 52 (B) and ground.
OK or NG
OK >> INSPECTION END
NG >> Repair harness or connector.
Unit Power source Fuse and fusible link No.
Front washer motor Ignition switch ON or START 84
Front wiper motor, front wiper relay, front wiper HI relay Battery 73
BCMBatteryM
22
Ignition switch ON or START 1
Terminals Ignition switch position
(+)
(-) OFF ON
Connector Terminal (Wire color)
M4 42 (L/R)
GroundBattery voltage Battery voltage
M4 55 (G) Battery voltage Battery voltage
M3 38 (W/L) 0V Battery voltage
PKIA5190E
49 (B), 52 (B) - Ground : Continuity should exist.
PKIA5191E

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CONSULT-II Functions (BCM)AKS007AD
CONSULT-II can display each diagnostic item using the following diagnostic test modes: work support, self-
diagnostic results, data monitor and active test through data reception and command transmission via the
BCM CAN communication line.
CONSULT-II OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and CON-
SULT-II CONVERTER to the data link connector, then turn the
ignition switch ON.
2. Touch “START (NISSAN BASED VHCL)”.
3. Touch “BCM” on “SELECT SYSTEM” screen.
If “BCM” is not indicated, refer to GI-40, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
BCM diagnosis position Check item, Diagnosis mode Description
WiperDATA MONITOR Displays BCM input data in real time.
ACTIVE TEST Device operation can be checked by applying a drive signal to device.
BCM CAN DIAG SUPPORT MNTR The result of transmit/receive diagosis of CAN commnucation can be read.
PBIB1503E
SKIA3098E
PKIA5222E

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3. Touch “IPDM E/R” on “SELECT SYSTEM” screen.
If “IPDM E/R” is not displayed, print “SELECT SYSTEM” screen,
then refer to GI-40, "
CONSULT-II Data Link Connector (DLC)
Circuit" .
4. Select the desired part to be diagnosed on the “SELECT DIAG
MODE” screen.
SELF-DIAGNOSTIC RESULTS
Refer to PG-21, "SELF-DIAG RESULTS" .
DATA MONITOR
Operation Procedure
1. Touch “DATA MONITOR” on “SELECT DIAG MODE ” screen.
2. Touch “ALL SIGNALS”, “MAIN SIGNALS” or “SELECTION FROM MENU” on the “DATA MONITOR”
screen.
3. Touch “START”.
4. Touch the required monitoring item on “SELECTION FROM MENU”. In “ALL SIGNALS”, all items are
monitored. In “MAIN SIGNALS”, predetermined items are monitored.
5. Touch “RECORD” while monitoring to record the status of the item being monitored. To stop recording,
touch “STOP”.
All Signals, Main Signals, Selection From Menu
NOTE:
Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is at ACC, the dis-
play may not be correct.
PKIA5222E
PKIA6016E
ALL SIGNALS All items will be monitored.
MAIN SIGNALS Monitor the predetermined item.
SELECTION FROM MENU Select any item for monitoring.
Item nameCONSULT-II
screen displayDisplay or unitMonitor item selection
Description
ALL
SIGNALSMAIN
SIGNALSSELECTION
FROM MENU
FR wiper request FR WIP REQ STOP/1LO/LO/HI×× ×Signal status input from BCM
Wiper auto stop WIP AUTO STOP ACT P/STOP P×× ×Output status of IPDM E/R
Wiper protection WIP PROT OFF/LS/HS/Block×× ×Control status of IPDM E/R

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5. CHECK IPDM E/R
With CONSULT-ll
1. Connect IPDM E/R connector and front wiper motor connector.
2. Using active test, check voltage between IPDM E/R harness
connector terminal and ground while front wiper (HI, LO) is oper-
ating.
Without CONSULT-ll
1. Connect IPDM E/R connector and front wiper motor connector.
2. Start up auto active test, and check voltage between IPDM E/R
harness connector terminal and ground while front wiper (HI,
LO) is operating.
OK or NG
OK >> Replace front wiper motor.
NG >> Replace IPDM E/R.
6. CHECK CIRCUIT BETWEEN COMBINATION SWITCH AND BCM
With CONSULT-ll
Select “BCM” on CONSULT-II. With “WIPER” on “DATA MONITOR”,
confirm that “FRONT WIPER INT”, “FRONT WIPER LOW”, and
“FRONT WIPER HI” turn ON-OFF according to wiper switch opera-
tion.
Without CONSULT-ll
Refer to LT- 11 3 , "
Combination Switch Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Check wiper Switch. Refer to LT- 11 3 , "
Combination
Switch Inspection" .
7. CHECK CIRCUIT BETWEEN IPDM E/R AND BCM
Select “BCM” on CONSULT-II, and perform self-diagnosis for
“BCM”.
Displayed self
-diagnosis results
NO DTC>>Replace BCM. Refer to BCS-15, "Removal and Installa-
tion of BCM" .
CAN COMM CIRCUIT>>Check CAN communication line of BCM.
GO TO BCS-14, "
CAN Communication Inspection Using
CONSULT-II (Self-Diagnosis)" .
Terminals
Condition Voltage IPDM E/R(+)
(-)
Connector Terminal (Wire color)
E721 (P)
GroundStopped Approx. 0V
LO operation Battery voltage
31 (PU)Stopped Approx. 0V
HI operation Battery voltagePKIA5194E
SKIA5300E
SKIA1039E