2010 INFINITI QX56 horn

PCS
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PCS-25
< ECU DIAGNOSIS > [IPDM E/R]
C
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B A
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N
43 L/Y Wiper auto stop signal Input
ON or
START Wiper switch OFF, LO, INT Battery voltage
44 BR Daytime light relay
control
(Canada only) Input ONDaytime light system active
0V
Daytime light system inactive Battery voltage
45 G/W Horn relay control Input ON When door locks are operated
using Intelligent Key (OFF
→
ON)* Battery voltage
→ 0V
46 GR Fuel pump relay con-
trol Input —Ignition switch ON or START
0V
Ignition switch OFF or ACC Battery voltage
47 O Throttle control motor
relay control Input —Ignition switch ON or START
0V
Ignition switch OFF or ACC Battery voltage
48 B/R Starter relay (inhibit
switch) Input
ON or
START Selector lever in "P" or "N"
0V
Selector lever any other posi-
tion Battery voltage
49 R/L Trailer tow relay
(With trailer tow)
Illumination
(Without trailer tow) Output ONLighting
switch must
be in the 1st
position OFF
0V
ON Battery voltage
50 W/R Front fog lamp (LH) Output ON or
START Lighting
switch must
be in the 2nd
position
(LOW beam
is ON) and
the front fog
lamp switch OFF
0V
ON Battery voltage
51 W/R Front fog lamp (RH) Output ON or
START Lighting
switch must
be in the 2nd
position
(LOW beam
is ON) and
the front fog
lamp switch OFF
0V
ON Battery voltage
52 L LH low beam head-
lamp
Output — Lighting switch in 2nd position Battery voltage
54 R/Y RH low beam head-
lamp Output — Lighting switch in 2nd position Battery voltage
55 G LH high beam head-
lamp Output —Lighting switch in 2nd position
and placed in HIGH or PASS
position Battery voltage
56 Y
(With
DTRL)
L/W
(Without DTRL) RH high beam head-
lamp
Output —Lighting switch in 2nd position
and placed in HIGH or PASS
position
Battery voltage
57 R/LPa

rking, license, and
tail lamp Output ONLighting
switch 1st po-
sition OFF
0V
ON Battery voltage
59 B Ground Input ——0V
Te r m i n a l
Wire
color Signal name Signal
input/
output Measuring condition
Reference value(Approx.)
Igni-
tion
switch Operation or condition
Revision: April 20092010 QX56

PCS-26
< ECU DIAGNOSIS >[IPDM E/R]
IPDM E/R (INTELLIGENT POWER DI
STRIBUTION MODULE ENGINE ROOM)
*: When horn reminder is ON60 B/W
Rear window defog-
ger relay
OutputON or
START Rear defogger switch ON
Battery voltage
Rear defogger switch OFF 0V
61 BR Fuse 32
(With trailer tow) Output OFF
—Battery voltage
Te r m i n a l
Wire
color Signal name Signal
input/
output Measuring condition
Reference value(Approx.)
Igni-
tion
switch Operation or condition
Revision: April 20092010 QX56

PG
HARNESSPG-45
< COMPONENT DIAGNOSIS >
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ENGINE ROOM HARNESS
ABMIA1200GB
C4 E1 GR/2 : Ambient sensor
C5 E113 W/2 : Cooling fan motor
D3 E2 W/16 : To F32 E3 E114 B/6 : Delta stroke motor
C3 E3 B/2 : Horn D1 E116 W/2 : Condenser-2
C3 E4 Y/2 : Crash zone sensor D3 E117 GR/2 : Front wheel sensor RH
C1 E5 W/24 : To F14 D3 E118 B/2: IPDM E/R (intelligent power distribution
module engine room)
Revision: April 20092010 QX56

SEC-2
B2191 DIFFERENCE OF KEY ..........................34
Description ........................................................... ...34
DTC Logic ...............................................................34
Diagnosis Procedure ..............................................34
B2192 ID DISCORD, IMMU-ECM ......................35
Description ........................................................... ...35
DTC Logic ...............................................................35
Diagnosis Procedure ..............................................35
B2193 CHAIN OF ECM-IMMU ...........................37
Description ........................................................... ...37
DTC Logic ...............................................................37
Diagnosis Procedure ..............................................37
B2194 ID DISCORD IMMU-I-KEY .....................38
Description ........................................................... ...38
DTC Logic ...............................................................38
Diagnosis Procedure ..............................................38
B2552 INTELLIGENT KEY ................................39
Description ........................................................... ...39
DTC Logic ...............................................................39
Diagnosis Procedure ..............................................39
Special Repair Requirement ...................................39
B2590 ID DISCORD BCM-I-KEY .................... ...40
Description ........................................................... ...40
DTC Logic ...............................................................40
Diagnosis Procedure ..............................................40
P1610 LOCK MODE ..........................................41
Description ........................................................... ...41
DTC Logic ...............................................................41
Diagnosis Procedure ..............................................41
P1611 ID DISCORD, IMMU-ECM ......................42
Description ........................................................... ...42
DTC Logic ...............................................................42
Diagnosis Procedure ..............................................42
P1612 CHAIN OF ECM-IMMU ...........................44
Description ........................................................... ...44
DTC Logic ...............................................................44
Diagnosis Procedure ..............................................44
P1614 CHAIN OF IMMU-KEY ...........................45
Description ........................................................... ...45
DTC Logic ...............................................................45
Diagnosis Procedure ..............................................45
P1615 DIFFRENCE OF KEY .............................48
Description ........................................................... ...48
DTC Logic ...............................................................48
Diagnosis Procedure ..............................................48
POWER SUPPLY AND GROUND CIRCUIT .....49
INTELLIGENT KEY UNIT ...................................... ...49
INTELLIGENT KEY UNIT : Diagnosis Procedure ...49
BCM ........................................................................ ...49
BCM : Diagnosis Procedure ....................................49
KEY CYLINDER SWITCH .................................51
Description ..............................................................51
Component Function Check ...................................51
Diagnosis Procedure ...............................................51
IGNITION KNOB SWITCH ................................53
Ignition Knob Switch Check ................................. ...53
HOOD SWITCH .................................................55
Diagnosis Procedure ............................................ ...55
HORN FUNCTION .............................................57
Symptom Table .................................................... ...57
VEHICLE SECURITY INDICATOR ...................58
Description ........................................................... ...58
Component Function Check ..................................58
Diagnosis Procedure ...............................................58
ECU DIAGNOSIS .......................................60
BCM (BODY CONTROL MODULE) ............... ...60
Reference Value .................................................. ...60
Terminal Layout ......................................................63
Physical Values .......................................................63
Wiring Diagram - VEHICLE SECURITY SYSTEM ...69
Wiring Diagram - IVIS .............................................80
Fail Safe .................................................................87
DTC Inspection Priority Chart ...............................88
DTC Index ..............................................................88
INTELLIGENT KEY UNIT ..................................90
Reference Value - Intelligent Key Unit ................. ...90
Reference Value - Steering Lock Solenoid .............93
Wiring Diagram - INTELLIGENT KEY SYSTEM/
ENGINE START FUNCTION - ................................
94
Fail Safe ...............................................................104
DTC Inspection Priority Chart .............................105
DTC Index ............................................................105
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) ................
106
Reference Value .................................................. .106
Terminal Layout ....................................................108
Physical Values .....................................................109
Fail Safe ...............................................................113
DTC Index ............................................................114
SYMPTOM DIAGNOSIS ...........................115
INTELLIGENT KEY SYSTEM/ENGINE
START FUNCTION SYMPTOMS ................... ..
115
Symptom Table .................................................... .115
VEHICLE SECURITY SYSTEM SYMPTOMS ..116
Symptom Table .....................................................116
INFINITI VEHICLE IMMOBILIZER SYSTEM-
NATS SYMPTOMS ...........................................
117
Symptom Table .................................................... .117
Revision: April 20092010 QX56

SEC-8
< BASIC INSPECTION >[WITH INTELLIGENT KEY SYSTEM]
PRE-INSPECTION FOR DIAGNOSTIC
2.CHECK SECURITY INDICATOR LAMP
1. Lock doors using Intelligent Key or mechanical key.
2. Check that security indicator lamp illuminates for 30 seconds.
Does the security indicator lamp illuminate?.
YES >> GO TO 3.
NO >> Perform diagnosis and repair. Refer to SEC-58, "
ComponentFunctionCheck".
3.CHECK ALARM FUNCTION
1. After 30 seconds, security indicator lamp will start to blink.
2. Open any door or hood before unlocking with Intelligent Key or mechanical key, or open back door or glass hatch without the presence of Intelligent Key.
Does the alarm function properly?
YES >> GO TO 4.
NO >> Check the following. • The vehicle security system does not phase in alarm mode. Refer to SEC-116, "
Symptom
Table".
• Alarm (horn and headlamps) does not operate. Refer to SEC-116, "
Symptom Table".
4.CHECK ALARM CANCEL OPERATION
Unlock any door using Intelligent Key or mechanical key.
Does the alarm (horn and headlamps) stop?
YES >> Inspection End.
NO >> Check door lock function. Refer to DLK-21, "
INTELLIGENT KEY : System Description".
Revision: April 20092010 QX56

SEC-18
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
VEHICLE SECURITY SYSTEM
VEHICLE SECURITY SYSTEM
System DiagramINFOID:0000000005147075
System DescriptionINFOID:0000000005147076
DESCRIPTION
The security system provides an audible and visual
alarm when an unauthorized access to the vehicle is
detected while the system is in armed phase.
The security system consist of the BCM managing the audible alarm (horn) and the visual alarm (headlamps).
OPERATION FLOW
Disarmed Phase
When the vehicle is being driven or when doors are open, the theft warning system is set in the disarmed
phase on the assumption that the owner is inside or near the vehicle.
Pre-Armed Phase And Armed Phase
The vehicle security system turns in to the pre-armed phase when ignition s witch is in OFF position, all doors
are closed and locked (using Intelligent Key, door reques t switch or auto relock function). The system auto-
matically shifts into the armed phase.
Condition of Activating The System
When the following condition is performed in armed phase, the system sounds the horns and flashes the
headlamps for about 45 seconds.
• Any door is opened.
ALKIA1420GB
PIIA1367E
Revision: April 20092010 QX56

VEHICLE SECURITY SYSTEMSEC-19
< FUNCTION DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Condition of Deactivating The System
When one of the following operations is performed, the armed phase is canceled.
• Unlock the doors with Intelligent Key or door request switch.
• Use the mechanical key to unlock the driver door using the door key cylinder.
Component Parts LocationINFOID:0000000005147077
ALKIA0961ZZ
1. BCM M18, M19, M20
(view with instrument panel LH removed) 2. IPDM E/R E122, E124
(view with cover removed) 3. Horn relay H-1
4. Main power window and door lock/unlock switch D7, D8 5. Power window and door lock/unlock
switch RH D105 6. Front door lock assembly LH (key cylin-
der switch) D14
Revision: April 20092010 QX56

SEC-20
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
VEHICLE SECURITY SYSTEM
Component Description
INFOID:0000000005147078
7. Front door switch LH B8 RH B108 8. Rear door switch LH B18
RH B116 9. Back door latch (door ajar switch) D503
Glass hatch ajar switch D707
10. Hood switch E13 11. Horn E3
(view with hood open) 12. Combination meter M24
13. Security indicator lamp
Item Function
BCM Controls the door lock function and room lamp function.
Door switch Provides the BCM with the status of each monitored door.
Hood switch Provides the IPDM E/R with the status of the hood.
Security indicator Indicates the status of the security system.
IPDM E/R Controls the horn and headlamp operation.
Horn Sounds when the vehicle security system is triggered.
Revision: April 20092010 QX56