INFINITI QX56 2006 Factory Service Manual

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FRONT WIPER AND WASHER SYSTEM
Revision: November 20092006 QX56
FRONT WIPER AND WASHER SYSTEMPFP:28810
Components Parts and Harness Connector LocationEKS00BDS
System DescriptionEKS00BDT

Both front wiper relays are located in the IPDM E/R (intelligent power distribution module engine room).

The wiper switch (combination switch) is composed of a combination of 5 output terminals and 5 input ter-
minals. Terminal combination status is read by the BCM when the wiper switch is turned ON.

BCM controls front wiper LO, HI, and INT (intermittent) operation.

IPDM E/R (intelligent power distribution module engine room) operates the wiper motor according to CAN
communication signals from the BCM.
Power is supplied at all times

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

to BCM terminal 70, and

through 30A fuse (No. 39, located in the IPDM E/R)

to front wiper relay (located in the IPDM E/R).
With the ignition switch in ON or START position, power is supplied

through 10A fuse (No. 9, located in the fuse block J/B)

to combination switch terminal 14, and

through 10A fuse (No. 59 located in the fuse and relay box)

to BCM terminal 38.
Ground is supplied
WKIA5719E
1. IPDM E/R E118, E119, E120, E121, E122, E123,
E124 2. Air cleaner case 3. Front and rear washer motor connec-
tor
E105
4. Washer fluid reservoir 5. Front wiper motor E236. Combination switch (wiper switch)
M28
7. BCM M18, M20

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to BCM terminal 67 and

to combination switch terminal 12

through grounds M57, M61 and M79, and

to IPDM E/R terminals 38 and 59 and

to front wiper motor terminal 1

through grounds E9, E15, and E24.
LOW SPEED WIPER OPERATION
When the ignition switch is in the ON or START position, and the front wiper switch is turned to the low posi-
tion, the BCM detects a low speed wiper ON request through the combination switch (wiper switch) reading
function. The BCM then sends a front wiper (low) request signal over CAN communication lines

from BCM terminals 39 and 40

to IPDM E/R terminals 39 and 40.
When IPDM E/R receives front wiper (low) request signal, it supplies ground to energize the front wiper relay.
With the front wiper relay energized, power is supplied

through front wiper relay

to front wiper high relay

through IPDM E/R terminal 32

to front wiper motor terminal 3.
With power and ground supplied, the front wiper motor operates at low speed.
HI SPEED WIPER OPERATION
When the ignition switch is in the ON or START position, and the front wiper switch is turned to the high posi-
tion, the BCM detects a high speed wiper ON request through the combination switch (wiper switch) reading
function. The BCM then sends a front wiper (high) request signal over CAN communication lines

from BCM terminals 39 and 40

to IPDM E/R terminals 39 and 40.
When the IPDM E/R receives a front wiper (high) request signal, it supplies ground to energize the front wiper
and the front wiper high relays.
With the front wiper and the front wiper high relays energized, power is supplied

through front wiper relay

to front wiper high relay

through IPDM E/R terminal 35

to front wiper motor terminal 2.
With power and ground supplied, the front wiper motor operates at high speed.
INTERMITTENT OPERATION
Wiper intermittent operation delay interval is determined from the combination of the intermittent wiper dial
position inputs and vehicle speed. During each intermittent operation delay interval, the BCM sends a front
wiper request signal to the IPDM E/R to operate the wipers.
When the ignition switch is in the ON or START position, and the front wiper switch is turned to an intermittent
position, the BCM detects a front wiper (intermittent) ON request through the combination switch (wiper
switch) reading function.
The BCM then sends a front wiper (intermittent) request signal over CAN communication lines

from BCM terminals 39 and 40

to IPDM E/R terminals 39 and 40.
When the BCM determines that combination switch status is front wiper intermittent ON, it performs the follow-
ing operations.

BCM detects ON/OFF status of intermittent wiper dial position.

BCM calculates operation interval from wiper dial position and vehicle speed signal received through CAN
communications.

BCM sends front wiper request signal (INT) to IPDM E/R at calculated operation interval.
When the IPDM E/R receives a front wiper request signal (INT), it supplies ground to energize the front wiper
relay. It then sends an auto-stop signal to the BCM, and conducts intermittent front wiper motor operation.

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FRONT WIPER AND WASHER SYSTEM
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AUTO STOP OPERATION
When the wiper arms are not located at the base of the windshield, and the wiper switch is turned OFF, the
wiper motor will continue to operate until the wiper arms reach the windshield base. When the wiper arms
reach the base of windshield, front wiper motor terminals 6 and 1 are connected.
Ground is supplied

to IPDM E/R terminal 43

through front wiper motor terminal 6

through front wiper motor terminal 1

through grounds E9, E15, and E24.
The IPDM E/R sends an auto stop operation signal to the BCM through CAN communication lines.
When the BCM receives an auto stop operation signal, the BCM sends wiper stop signal to the IPDM E/R over
CAN communication lines. The IPDM E/R then de-energizes the front wiper relay.
The wiper motor will then stop the wiper arms at the STOP position.
FRONT WASHER OPERATION
When the ignition switch is in the ON or START position, and the front and rear washer switches are OFF, the
front and rear washer motor is supplied power

through 10A fuse (No. 9, located in the fuse block J/B)

through combination switch (wiper switch) terminal 14

through combination switch (wiper switch) terminal 13

to front and rear washer motor terminal 1, and

through combination switch (wiper switch) terminal 11

to front and rear washer motor terminal 2.
When the front wiper switch is in the front washer position, the BCM detects a front washer signal request
through the combination switch (wiper switch) reading function.
Combination switch ground is supplied

to front and rear washer motor terminal 2

through combination switch (wiper switch) terminal 11

through combination switch (wiper switch) terminal 12

through grounds M57, M61 and M79.
With ground supplied, the front and rear washer motor is operated in the front direction.
When the BCM detects that front washer motor has operated for 0.4 seconds or longer, the BCM uses CAN
communication and sends a wiper request signal to the IPDM E/R for low speed operation of wipers.
When the BCM detects that the washer switch is OFF, low speed operation cycles approximately 3 times and
then stops.
MIST OPERATION
When the wiper switch is temporarily placed in 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.
FAIL-SAFE FUNCTION
The BCM includes fail-safe function to prevent malfunction of electrical components controlled by CAN com-
munications if a malfunction in CAN communications occurs.
The BCM uses CAN communications to stop output of electrical components it controls.
Until the ignition switch is turned off, the front wiper system remains in same status as just before fail-safe con-
trol was initiated. (If wiper was in low speed operation just before fail-safe, it continues low speed operation
until ignition switch is turned OFF.)
When fail-safe status is initiated, the BCM remains in standby until normal signals are received.
When normal signals are received, fail-safe status is canceled.
COMBINATION SWITCH READING FUNCTION
Refer to WW-6, "COMBINATION SWITCH READING FUNCTION" .
CAN Communication System DescriptionEKS00BDU
Refer to LAN-26, "CAN COMMUNICATION" .

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SchematicEKS00BDV
WKWA3608E

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FRONT WIPER AND WASHER SYSTEM
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Wiring Diagram — WIPER —EKS00BDW
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WKWA3610E

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FRONT WIPER AND WASHER SYSTEM
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Terminals and Reference Values for BCMEKS00BDX
Te r m i -
nal No. Wire
color Signal name Measuring condition
Reference Value (V)
(Approx.)
Ignition
switch Operation or condition
2 SB Combination switch input 5 ON

Light switch and wiper switch OFF

Wiper dial position 4
3 G/Y Combination switch input 4 ON

Light switch and wiper switch OFF

Wiper dial position 4
4 Y Combination switch input 3 ON

Light switch and wiper switch OFF

Wiper dial position 4
5 G/B Combination switch input 2 ON

Light switch and wiper switch OFF

Wiper dial position 4
6 V Combination switch input 1
32 R/G Combination switch output 5 ON

Light switch and wiper switch OFF

Wiper dial position 4
33 R/Y Combination switch output 4 ON

Light switch and wiper switch OFF

Wiper dial position 4
34 L Combination switch output 3 ON

Light switch and wiper switch OFF

Wiper dial position 4
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E

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FRONT WIPER AND WASHER SYSTEM
Revision: November 20092006 QX56
Terminals and Reference Values for IPDM E/R EKS00BDY
Work FlowEKS00BDZ
1. Confirm the trouble symptom or customer complaint.
2. Understand the system description, refer to WW-4, "
System Description" .
3. Perform preliminary inspection, refer to WW-12, "
Preliminary Inspection" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does wiper function operate normally? If it operates normally, GO TO 6. If not, GO TO 4.
6. Inspection End.
Preliminary InspectionEKS00BE0
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
Inspection procedure
1. CHECK FUSE
Check if wiper or washer fuse is blown.
35 O/B Combination switch output 2
ON

Light switch and wiper switch OFF

Wiper dial position 4
36 R/W Combination switch output 1
38 W/L Ignition switch (ON) ON— Battery
39 L CAN-H ON——
40 P CAN-L ON——
67 B Ground —— 0
70 W/B Battery power OFF— Battery
Te r m i -
nal No. Wire
color Signal name Measuring condition
Reference Value (V)
(Approx.)
Ignition
switch Operation or condition
SKIA5292E
Terminal
No. Wire
color Signal name Measuring condition
Reference value (V)
(Approx.)
Ignition
switch Operation or condition
32 L Low speed signal ON Wiper switchOFF
0
LO Battery
35 L/B High speed signal ON Wiper switchOFF
0
HI Battery
38 B Ground —— 0
39 L CAN-H ON——
40 P CAN-L ON——
43 L/Y Wiper auto stop signal ON Wiper operating
Battery
Wiper stopped 0
59 B Ground —— 0
UnitPower source Fuse No.
Front and rear washer motor Ignition switch ON or START 9
Front wiper relay Battery39
BCM Ignition switch ON or START
59
Battery f

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OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of problem before installing new fuse. Refer to PG-4,
"POWER SUPPLY ROUTING CIRCUIT" .
2. CHECK POWER SUPPLY CIRCUIT
1. Disconnect BCM connectors.
2. Check voltage between BCM harness connector terminals and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open or short between BCM and fuse.
3. GROUND CIRCUIT INSPECTION (BCM)
Check for continuity between BCM terminal and ground.
OK or NG
OK >> Inspection End.
NG >> Repair/replace BCM ground circuit.
Terminals Ignition switch position
(+) (– )O FF O N
Connector Terminal
M18 38 Ground0V
Battery voltage
M20 70 Battery voltage
WKIA2089E
Terminals
Ignition switch
condition Continuity
Connector Terminal
M20 67 Ground OFF Yes
WKIA2090E