turn signal INFINITI QX56 2011 Factory Service Manual

PCS
SYSTEMPCS-7
< SYSTEM DESCRIPTION > [IPDM E/R]
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IGNITION RELAY MALFUNCTION DETECTION FUNCTION
 IPDM E/R monitors the voltage at the contact circuit and
excitation coil circuit of the ignition relay inside it.
 IPDM E/R judges the ignition relay error if the volt age differs between the contact circuit and the excitation
coil circuit.
 If the ignition relay cannot turn OFF due to contact seizure, it activates the tail lamp relay for 10 minutes to alert the user to the ignition relay malfunc tion when the ignition switch is turned OFF.
FRONT WIPER PROTECTION FUNCTION
IPDM E/R detects front wiper stop position by a front wiper stop position signal.
When a front wiper stop position signal is in the conditi ons listed below, IPDM E/R stops power supply to wiper
after repeating a front wiper 10 seconds activation and 20 seconds stop.
NOTE:
This operation status can be confirmed on the IPDM E/ R “Data Monitor” that displays “BLOCK” for the item
“WIP PROT” while the wiper is stopped.
STARTER MOTOR PROTECTION FUNCTION
IPDM E/R turns OFF the starter control relay to protect the starter motor when the starter control relay remains
active for 90 seconds.
POWER CONTROL SYSTEM
Control part Fail-safe operation
Headlamp  Turns ON the headlamp low relay when the ignition switch is turned ON
 Turns OFF the headlamp low relay when the ignition switch is turned OFF
 Headlamp high relay OFF
Parking lamp
 License plate lamp
 Illumination
 Tail lamp  Turns ON the tail lamp relay when the ignition switch is turned ON
 Turns OFF the tail lamp relay when the ignition switch is turned OFF
Front wiper motor  The status just before activation of fail-safe control is maintained until the ignition switch is
turned OFF while the front wiper is operating at LO or HI speed.
 The wiper is operated at LO speed until the ignition switch is turned OFF if the fail-safe con- trol is activated while the front wiper is set in the INT mode and the front wiper motor is op-
erating.
 Return automatically wiper to stop position when ignition switch is turned ON if fail-safe con- trol is activated while front wiper motor is operated and wiper stops in the other position than
stop position.
Front fog lamp Front fog lamp relay OFF
Horn Horn OFF
Ignition relay The status just before activation of fail-safe is maintained.
Starter motor Starter control relay OFF
Steering lock unit Steering lock relay OFF
Voltage judgment IPDM E/R judgment Operation
Ignition relay contact side Ignition relay excitation coil
side
ON ON Ignition relay ON normal —
OFF OFF Ignition relay OFF normal —
ON OFF Ignition relay ON stuck  Detects DTC “B2098: IGN RELAY ON”
 Turns ON the tail lamp relay for 10 min-
utes
OFF ON Ignition relay OFF stuck Detects DTC “B2099: IGN RELAY OFF”
Ignition switch Front wiper switch Front wiper stop position signal
ON OFF
The front wiper stop position signal (stop position) cannot be input for
10 seconds.
ON The front wiper stop position signal does not change for 10 seconds.
Revision: 2010 May2011 QX56

PCS-18
< ECU DIAGNOSIS INFORMATION >[IPDM E/R]
IPDM E/R
17
(B) Ground Cooling fan motor
ground
Output Ignition switch ON 0 V
18
(B) Ground Ground — Ignition switch ON 0 V
19
(V) Ground Front fog lamp (RH) Output Lighting
switch 2ND or
AUTO (Light
is illuminated)Front fog lamp switch
OFF
0 V
Front fog lamp switch ON Battery voltage
20
(W) Ground Front fog lamp (LH) Output Lighting
switch 2ND or
AUTO (Light
is illuminated)Front fog lamp switch
OFF
0 V
Front fog lamp switch ON Battery voltage
21
(L) Ground
Headlamp washer re-
lay control Output
Ignition switch
ON Headlamp washer acti-
vated
0 V
Headlamp washer deacti-
vated 12 V
23
(GR/R) Ground Cranking request Output Select lever P or N (Ignition switch ON) 0 V
Select lever in any position other than P or
N (Ignition switch ON)
12 V
Engine running 12 V
24
(W/G) Ground Oil pressure switch Input Ignition switch
ONEngine stopped 0 V
Engine running 12 V
25
(L/Y) Ground Front wiper stop posi-
tion InputIgnition switch
ON Front wiper stop position 0 V
Any position other than
front wiper stop position
12 V
26
(P) Ground CAN-L Input/
Output ——
27
(L) Ground CAN-H
Input/
Output ——
30
(R/W) Ground Starter relay control Output  Ignition switch OFF or ACC
 At engine cranking
0 V
 Ignition switch ON
 Engine running 12 V
31
(B) Ground Injector relay control Output  Approximately 1 second after turning
the ignition switch ON
 Engine running 0 - 1.5 V
Approximately 1 second or more after turn-
ing the ignition switch ON Battery voltage
32
(LG) Ground Hood switch Input Close the hood 12 V
Open the hood 0 V
33
(R) Ground Alternator control Output Ignition switch OFF or ACC 0 V
Ignition switch ON 6 V
34
(P/B) Ground Horn relay control Output The horn is deactivated Battery voltage
The horn is activated 0 V
Te r m i n a l N O .
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+–
Revision: 2010 May2011 QX56

PCS
IPDM E/RPCS-19
< ECU DIAGNOSIS INFORMATION > [IPDM E/R]
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(W) Ground ECM relay power sup-
ply OutputIgnition switch OFF
(More than a few seconds after turning ig-
nition switch OFF)
0 V
 Ignition switch ON
 Ignition switch OFF (For a few seconds after turning ignition
switch OFF) Battery voltage
36
(V) Ground ECM relay power sup-
ply
OutputIgnition switch OFF or ACC 0 V
Ignition switch ON Battery voltage
37
(L) Ground Parking lamp (RH) Output Ignition switch
ONLighting switch OFF 0 V
Lighting switch 1ST Battery voltage
38
(Y) Ground Tail lamp (RH) Output Ignition switch
ONLighting switch OFF 0 V
Lighting switch 1ST Battery voltage
39
(L/B) Ground Front wiper HI Output Ignition switch
ONFront wiper switch OFF 0 V
Front wiper switch LO 9 V
Front wiper switch HI Battery voltage
41
(L/G) Ground ECM relay control Output Ignition switch OFF
(More than a few seconds after turning ig-
nition switch OFF)
Battery voltage
 Ignition switch ON
 Ignition switch OFF (For a few seconds after turning ignition
switch OFF) 0 - 1.5 V
42
(L) Ground Battery power supply Output Ignition switch OFF
(More than a few seconds after turning ig-
nition switch OFF)
0 V
 Ignition switch ON
 Ignition switch OFF (For a few seconds after turning ignition
switch OFF) Battery voltage
43
(LG) Ground Parking lamp (LH) Output
Ignition switch
ONLighting switch OFF 0 V
Lighting switch 1ST Battery voltage
44
(L/W) Ground Tail lamp (LH), license
plate lamp
OutputIgnition switch
ON Lighting switch OFF 0 V
Lighting switch 1ST Battery voltage
45
(Y/R) Ground Front wiper LO Output Ignition switch
ONFront wiper switch OFF 0 V
Front wiper switch LO Battery voltage
46
(L/W) Ground
Steering lock unit pow-
er supply OutputIgnition switch ACC or ON 0 V
Ignition switch
OFF
A few seconds after
opening the driver door
Battery voltage
Ignition switch
LOCK Press the push-button ig-
nition switch
Battery voltage
48
(BR) Ground P/N position Input Select lever in any position other than P or
N (Ignition switch ON)
0 V
Select lever P or N (Ignition switch ON) 12 V
49
(R) Ground Headlamp HI (RH) Output Lighting
switch 2ND or
AUTO (Light
is illuminated)Lighting switch other than
HI and PASS
0 V
 Lighting switch HI
 Lighting switch PASS Battery voltage
Te r m i n a l N O .
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+–
Revision: 2010 May2011 QX56

PCS-20
< ECU DIAGNOSIS INFORMATION >[IPDM E/R]
IPDM E/R
50
(LG/B) Ground Headlamp HI (LH) Output Lighting
switch 2ND or
AUTO (Light
is illuminated)Lighting switch other than
H and PASS
0 V
 Lighting switch HI
 Lighting switch PASS Battery voltage
51
(BR/Y) Ground Headlamp LO (LH) Output Lighting switch OFF 0 V
Lighting switch 2ND or AUTO (light is illu-
minated)
Battery voltage
52
(W) Ground Headlamp LO (RH) Output Lighting switch OFF 0 V
Lighting switch 2ND or AUTO (light is illu-
minated)
Battery voltage
54
(SB) Ground ECM power supply Output Approximately 1 second or more than after
turning the ignition switch ON
0 V
 Approximately 1 second after turning the ignition switch ON
 Engine running Battery voltage
55
(O) Ground Throttle control motor
relay power supply
OutputIgnition switch OFF
(More than a few seconds after turning ig-
nition switch OFF)
0 V
 Ignition switch ON
 Ignition switch OFF (For a few seconds after turning ignition
switch OFF) Battery voltage
56
(L) Ground A/C compressor power
supply OutputEngine run-
ning A/C switch OFF 0 V
A/C switch ON
(A/C compressor is oper-
ating)
Battery voltage
57
(V) Ground Ignition relay power
supply
OutputIgnition switch OFF or ACC 0 V
Ignition switch ON Battery voltage
58
(BR/R) Ground Ignition relay power
supply
OutputIgnition switch OFF or ACC 0 V
Ignition switch ON Battery voltage
59
(W/B) Ground Ignition relay power
supply
OutputIgnition switch OFF or ACC 0 V
Ignition switch ON Battery voltage
60
(V/R) Ground
Throttle control motor
relay control OutputIgnition switch ON
→ OFF 0 - 1.0 V
↓
Battery voltage
↓
0 V
Ignition switch ON 0 - 1.0 V
61
(W) Ground Ignition relay power
supply
OutputIgnition switch OFF or ACC 0 V
Ignition switch ON Battery voltage
62
(SB) Ground Ignition relay power
supply
OutputIgnition switch OFF or ACC 0 V
Ignition switch ON Battery voltage
63
(P) Ground Steering lock unit con-
dition-2
InputSteering lock is unlocked 0 V
Steering lock is locked 12 V
64
(G/Y) Ground A/T shift selector
(detention switch) InputIgnition switch
ON Select lever P 0 V
Select lever in any posi-
tion other than P
12 V
65
(L) Ground
Steering lock unit con-
dition-1 InputSteering lock is unlocked 12 V
Steering lock is locked 0 V
Te r m i n a l N O .
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+–
Revision: 2010 May2011 QX56

PCS
IPDM E/RPCS-21
< ECU DIAGNOSIS INFORMATION > [IPDM E/R]
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Fail-SafeINFOID:0000000006220173
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible,
IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With ECM
If No CAN Communication Is Available With BCM
66
(SB) Ground
Push-button ignition
switch InputPress the push-button ignition switch 0 V
Release the push-button ignition switch 12 V
68
(O) Ground Ignition relay monitor Input Ignition switch OFF or ACC 12 V
Ignition switch ON 0 V
69
(W/B) Ground Ignition power supply Output Ignition switch OFF or ACC 0 V
Ignition switch ON Battery voltage
72
(Y/R) Ground Cooling fan control Output Ignition switch
OFF 5 V
ACC 0 V
ON
2. 5 V
Engine running
Te r m i n a l N O .
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+–
JMMIA0404GB
Control part Fail-safe operation
Cooling fan  Transmits the pulse duty signal (PWM signal) 100% when the ignition switch is turned ON.
 Transmits the pulse duty signal (PWM signal)
0% when the ignition switch is turned OFF.
A/C compressor A/C relay OFF
Alternator Transmits the power generation command signal (PWM signal) 0%
Control part Fail-safe operation
Headlamp  Turns ON the headlamp low relay when the ignition switch is turned ON
 Turns OFF the headlamp low relay when the ignition switch is turned OFF
 Headlamp high relay OFF
Parking lamp
 License plate lamp
 Illumination
 Tail lamp
 Side marker lamp  Turns ON the tail lamp relay when the ignition switch is turned ON
 Turns OFF the tail lamp relay when the ignition switch is turned OFF
Front wiper motor  The status just before activation of fail-safe control is maintained until the ignition switch is
turned OFF while the front wiper is operating at LO or HI speed.
 The wiper is operated at LO speed until the ignition switch is turned OFF if the fail-safe con-
trol is activated while the front wiper is set in the INT mode and the front wiper motor is op-
erating.
 Return automatically wiper to stop position when ignition switch is turned ON if fail-safe con-
trol is activated while front wiper motor is operated and wiper stops in the other position than
stop position.
Front fog lamp Front fog lamp relay OFF
Horn Horn OFF
Revision: 2010 May2011 QX56

PCS-22
< ECU DIAGNOSIS INFORMATION >[IPDM E/R]
IPDM E/R
IGNITION RELAY MALFUNCTION DETECTION FUNCTION
 IPDM E/R monitors the voltage at the contact circuit and
excitation coil circuit of the ignition relay inside it.
 IPDM E/R judges the ignition relay error if the volt age differs between the contact circuit and the excitation
coil circuit.
 If the ignition relay cannot turn OFF due to contact seiz ure, it activates the tail lamp relay for 10 minutes to
alert the user to the ignition relay malfunction when the ignition switch is turned OFF.
FRONT WIPER PROTECTION FUNCTION
IPDM E/R detects front wiper stop positi on by a front wiper stop position signal.
When a front wiper stop position signal is in the conditi ons listed below, IPDM E/R stops power supply to wiper
after repeating a front wiper 10 seconds activation and 20 seconds stop.
NOTE:
This operation status can be confirmed on the IPDM E/ R “Data Monitor” that displays “BLOCK” for the item
“WIP PROT” while the wiper is stopped.
STARTER MOTOR PROTECTION FUNCTION
IPDM E/R turns OFF the starter control relay to protect the starter motor when the starter control relay remains
active for 90 seconds.
DTC IndexINFOID:0000000006220174
NOTE:
 The details of time display are as follows.
- CRNT: A malfunction is detected now.
- PAST: A malfunction was detected in the past.
 IGN counter is displayed on FFD (Freeze Frame data).
- The number is 0 when is detected now.
- The number increases like 1 → 2 ··· 38 → 39 after returning to the normal condition whenever IGN OFF →
ON.
- The number is fixed to 39 until the self-diagnosis results are erased if it is over 39.
× : Applicable
Ignition relay The status just before activation of fail-safe is maintained.
Starter motor Starter control relay OFF
Steering lock unit Steering lock relay OFF Control part Fail-safe operation
Voltage judgment
IPDM E/R judgment Operation
Ignition relay contact side Ignition relay excitation coil
side
ON ON Ignition re lay ON normal —
OFF OFF Ignition relay OFF normal —
ON OFF Ignition relay ON stuck  Detects DTC “B2098: IGN RELAY ON”
 Turns ON the tail lamp relay for 10 min-
utes
OFF ON Ignition relay OFF stuck Detects DTC “B2099: IGN RELAY OFF”
Ignition switch Front wiper switch Front wiper stop position signal
ON OFF
The front wiper stop position signal (stop position) cannot be input for
10 seconds.
ON The front wiper stop position signal does not change for 10 seconds.
CONSULT display Fail-safe Refer to
No DTC is detected.
further testing
may be required. ——
U1000: CAN COMM CIRCUIT ×PCS-28
B2098: IGN RELAY ON ×PCS-29
Revision: 2010 May2011 QX56

PCS-28
< DTC/CIRCUIT DIAGNOSIS >[IPDM E/R]
U1000 CAN COMM CIRCUIT
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006220176
CAN (Controller Area Network) is a serial communication
line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, 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) al lowing a high rate of information transmission with less
wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to LAN-28, "
CAN COMMUNICATION SYSTEM : CAN Communica-
tion Signal Chart".
DTC LogicINFOID:0000000006220177
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000006220178
1.PERFORM SELF DIAGNOSTIC
1. Turn the ignition switch ON and wait for 2 seconds or more.
2. Check “Self Diagnostic Result” of IPDM E/R.
Is DTC
“U1000” displayed?
YES >> Refer to LAN-18, "Trouble Diagnosis Flow Chart".
NO >> Refer to GI-40, "
Intermittent Incident".
DTCCONSULT-III display
description DTC Detection Condit
ion Possible cause
U1000 CAN COMM CIRCUIT When IPDM E/R cannot communicate CAN communi-
cation signal continuously for 2 seconds or more CAN communication system
Revision: 2010 May2011 QX56

PCS
B2098 IGNITION RELAY ON STUCKPCS-29
< DTC/CIRCUIT DIAGNOSIS > [IPDM E/R]
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B2098 IGNITION RELAY ON STUCK
DescriptionINFOID:0000000006220179
 IPDM E/R operates the ignition relay when it receives
an ignition switch ON signal from BCM via CAN com-
munication.
 Turn the ignition relay OFF by pressing the push-butt on ignition switch once when the vehicle speed is 4 km/
h (2.5 MPH) or less.
 Turn the ignition relay OFF with the following operat ion when the vehicle speed is more than 4 km/h (2.5
MPH) or when an abnormal condition occurs in CAN communication from the combination meter (Emer-
gency OFF)
- Press and hold the push-button ignition switch for 2 seconds or more.
- Press the push-button ignition switch 3 times within 1.5 seconds.
NOTE:
The ignition relay does not turn ON for 3 seconds af ter emergency OFF even if the push-button ignition switch
is pressed.
DTC LogicINFOID:0000000006220180
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000006220181
1.PERFORM SELF DIAGNOSIS
1. Turn the ignition switch ON.
2. Erase “Self Diagnostic Result” of IPDM E/R.
3. Turn the ignition switch OFF, and wait for 1 second or more.
4. Turn the ignition switch ON. Check “Self Diagnostic Result” again.
Is DTC
“B2098” displayed?
YES >> Replace IPDM E/R. Refer to PCS-32, "Removal and Installation".
NO >> Refer to GI-40, "
Intermittent Incident".
DTCCONSULT-III dis-
play description DTC Detection Condit
ion Possible causes
B2098 IGN RELAY ON The ignition relay ON is detected for 1 second at ignition switch OFF
(CPU monitors the status at the contact and excitation coil circuits
of the ignition relay inside it) Ignition relay malfunction
Revision: 2010 May2011 QX56

PCS-30
< DTC/CIRCUIT DIAGNOSIS >[IPDM E/R]
B2099 IGNITION RELAY OFF STUCK
B2099 IGNITION RELAY OFF STUCK
DescriptionINFOID:0000000006220182
 IPDM E/R operates the ignition relay when it receives
an ignition switch ON signal from BCM via CAN com-
munication.
 Turn the ignition relay OFF by pressing the push-butt on ignition switch once when the vehicle speed is 4 km/
h (2.5 MPH) or less.
 Turn the ignition relay OFF with the following operati on when the vehicle speed is more than 4 km/h (2.5
MPH) or when an abnormal condition occurs in CAN communication from the combination meter (Emer-
gency OFF)
- Press and hold the push-button ignition switch for 2 seconds or more.
- Press the push-button ignition switch 3 times within 1.5 seconds.
NOTE:
The ignition relay does not turn ON for 3 seconds af ter emergency OFF even if the push-button ignition switch
is pressed.
DTC LogicINFOID:0000000006220183
DTC DETECTION LOGIC
NOTE:
When IPDM E/R power supply voltage is low (Approx. 7 - 8 V for about 1 second), the “DTC: B2099” may be detected.
Diagnosis ProcedureINFOID:0000000006220184
1.PERFORM SELF DIAGNOSIS
1. Turn the ignition switch ON.
2. Erase “Self Diagnostic Result”.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON. Check “Self Diagnostic Result” again.
Is DTC
“B2099” displayed?
YES >> Replace IPDM E/R. Refer to PCS-32, "Removal and Installation".
NO >> Refer to GI-40, "
Intermittent Incident".
DTCCONSULT-III dis-
play description DTC Detection Condit
ion Possible causes
B2099 IGN RELAY OFF The ignition relay OFF is detected for 1 second at ignition switch ON
(CPU monitors the status at the contact and excitation coil circuits of
the ignition relay inside it) Ignition relay malfunction
Revision: 2010 May2011 QX56

PCS
POWER SUPPLY AND GROUND CIRCUITPCS-31
< DTC/CIRCUIT DIAGNOSIS > [IPDM E/R]
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POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000006220185
1.CHECK FUSES AND FUSIBLE LINK
Check that the following IPDM E/R fuses or fusible links are not blown.
Is the fuse fusing?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is blown.
NO >> GO TO 2.
2.CHECK POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check voltage between IPDM E/R harness connector and the ground.
Is the measurement value normal?
YES >> GO TO 3.
NO >> Repair the harness or connector.
3.CHECK GROUND CIRCUIT
Check continuity between IPDM E/R harness connectors and the ground.
Does continuity exist?
YES >> INSPECTION END
NO >> Repair the harness or connector.
Signal name Fuses and fusible link No.
Battery power supply C (100 A)
N (60 A)
37 (10 A)
(+) (− ) Voltag e
(Approx.)
IPDM E/R
Connector Terminal
E9 1
Ground Battery voltage
2
E10 8
IPDM E/R
GroundContinuity
Connector Terminal
E11 9 Existed
E12 18
Revision: 2010 May2011 QX56