2011 INFINITI QX56 ECU

SRC-1
RESTRAINTS
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SECTION SRC
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CONTENTS
SRS AIRBAG CONTROL SYSTEM
PRECAUTION ................ ...............................6
PRECAUTIONS .............................................. .....6
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
6
Service ......................................................................6
SYSTEM DESCRIPTION ..............................8
COMPONENT PARTS ................................... .....8
Component Parts Location .................................. ......8
Component Description .............................................9
SYSTEM .............................................................11
System Diagram .................................................. ....11
System Description .................................................12
DIAGNOSIS SYSTEM (AIR BAG) .....................14
Description .......................................................... ....14
On Board Diagnosis Function .................................14
CONSULT-III Function ............................................19
DIAGNOSIS SYSTEM (OCCUPANT DETEC-
TION SYSTEM) .............................................. ....
21
CONSULT-III Function ........................................ ....21
ECU DIAGNOSIS INFORMATION ..............22
DIAGNOSIS SENSOR UNIT .......................... ....22
DTC Index .......................................................... ....22
WIRING DIAGRAM ......................................27
SRS AIR BAG SYSTEM ................................. ....27
Wiring Diagram ................................................... ....27
BASIC INSPECTION ...................................36
DIAGNOSIS AND REPAIR WORK FLOW .... ....36
Work Flow ........................................................... ....36
INSPECTION AND ADJUSTMENT ....................39
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT .................................................... ....
39
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description .................................
39
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Special Repair Requirement ......
39
ZERO POINT RESET ............................................. ....39
ZERO POINT RESET : Description .........................39
ZERO POINT RESET : Special Repair Require-
ment .........................................................................
39
DTC/CIRCUIT DIAGNOSIS .........................41
B1001, B1002, B1003, B1004, B1005 DIAG-
NOSIS SENSOR UNIT ......................................
41
DTC Logic ............................................................ ....41
Diagnosis Procedure ...............................................41
B1006, B1007, B1008, B1009, B1010 DIAG-
NOSIS SENSOR UNIT ......................................
42
DTC Logic ................................................................42
Diagnosis Procedure ...............................................42
B1011, B1012, B1013, B1014, B1015 DIAG-
NOSIS SENSOR UNIT ......................................
43
DTC Logic ................................................................43
Diagnosis Procedure ...............................................43
B1017, B1020, B1021 OCCUPANT SENS C/U
...
44
Description ........................................................... ....44
DTC Logic ................................................................44
Diagnosis Procedure ...............................................44
B1018 OCCUPANT SENS ................................46
Description ........................................................... ....46
DTC Logic ................................................................46
Diagnosis Procedure ...............................................46
B1022 OCCUPANT SENS C/U .........................48
Description ...............................................................48
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (AIR BAG)SRC-19
< SYSTEM DESCRIPTION >
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When front satellite sensor LH (Item display1) and r ear curtain air bag module LH system (Item display 2)
are malfunctioning.
 Front air bag system and side air bag system When driver air bag module (Item display 1) and front satellite sensor RH (Item display2) are malfunctioning.
CONSULT-III FunctionINFOID:0000000006219954
APPLICATION ITEM
CONSULT-III performs the following functions.
HOW TO ERASE SELF DIAGNOSTIC RESULTS
 “Self Diagnostic Result”
A current self-diagnostic result is displayed on CONSULT-III screen in real time.
After the malfunction is repaired completely, no malfunction is detected on “Self Diagnostic Result”.
 “SELF-DIAG [PAST]” Return to “Self Diagnostic Result” CONSULT-III scr een by touching the “BACK” key of CONSULT-III and
select “Self Diagnostic Result” in SELECT DIAG MO DE. Touch “Erase” in “Self Diagnostic Result” mode.
NOTE:
If the memory of the malfunction in “SELF-DIAG [P AST]” is not erased, the user mode shows the system
malfunction by the illumination of the warning lamp even if the malfunction is repaired completely.
 “TROUBLE DIAG RECORD”
JMHIA0949GB
JMHIA0950GB
Diagnosis mode Description
Ecu Identification Air bag diagnosis sensor unit ECU discriminated number (identification num-
ber) is displayed. Air bag diagnosis sensor unit has individual ECU discriminat-
ed number (identification number) based on model and equipment.
Self Diagnostic Result The current self diagnosis results (also indicated with the number of air bag
warning lamp blinks in the diagnosis mode) are displayed on CONSULT-III
screen in real time. This refers to a malfunctioning part requiring repairs.
Refer to
SRC-22, "
DTCIndex".
Function Test CAR COMPUTER DIAG. Test result is indicated using “OK” or “NG” so that the customer recognizes eas-
ily.
Special function SELF-DIAG [PAST]
Diagnosis results previously stored in the memory are displayed on CONSULT-
III screen. The stored results are not erased until memory erasing is executed.
TROUBLE DIAG RECORD With TROUBLE DIAG RECORD, diagnosis results previously erased by a re-
set operation can be displayed on CONSULT-III screen.
SELF-DIAG RESULT [CAN] This item is displayed, but cannot be supported.
CAUSE OF WARNING It displays the cause of warning lamp illumination that is not recorded in mem-
ory.
Revision: 2010 May2011 QX56

SRC-22
< ECU DIAGNOSIS INFORMATION >
DIAGNOSIS SENSOR UNIT
ECU DIAGNOSIS INFORMATION
DIAGNOSIS SENSOR UNIT
DTC IndexINFOID:0000000006219956
DTC Diagnostic item Explanation Reference page— NO DTC IS DETECTED. When malfunction is
indicated by the “AIR
BAG” warning lamp in
the user modeLow battery voltage (Less than 9 V) or
High battery voltage (more than 16 V)
SRC-19, "
CON-
SULT-III Func-
tion".
Malfunction occurs in Occpant detac-
tion System SRC-19, "
CON-
SULT-III Func-
tion".
Self-diagnostic result is not erased af-
ter repair SRC-14, "
On
Board Diagnosis
Function",
SRC-
19, "CONSULT-
III Function".
Intermittent malfunction is detected in
the past GI-40, "
Intermit-
tent Incident"
No malfunction is detected —
B1001-B1015 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning 
SRC-41,
"DTC Logic".
 SRC-42,
"DTC Logic".
 SRC-43,
"DTC Logic".
B1017
B1020
B1021 OCCUPANT SENS C/U
[UNIT FAIL]
Malfunction occurs in Occupant Detection System control unit SRC-44, "
DTC
Logic"
B1018OCCUPANT SENS
[UNIT FAIL]
Malfunction occurs in Occupant Detection System sensor SRC-46, "DTC
Logic"
B1022OCCUPANT SENS C/U
[COMM FAIL] Malfunction occurs in Occupant Detection System control unit,
circuit of Occupant Detection System control unit, or air bag di-
agnosis sensor unit SRC-48, "DTC
Logic"
B1023 PASS A/B INDCTR CKT
Front passenger air bag OFF indicator circuit is open or short-
ed to ground or the circuits are shorted each other SRC-50, "DTC
Logic"
B1025
B1032
B1048
OCS SENSOR Malfunction occurs in Occupant Detection System control unit,
circuit of Occupant Detection System control unit, or air bag di-
agnosis sensor unit SRC-52, "DTC
Logic"
B1026-B1031 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning
SRC-54, "DTC
Logic".
B1033
B1034 CRASH ZONE SEN
[UNIT FAIL]
Crash zone sensor is malfunctioning
SRC-55, "
DTC
Logic".
B1035 CRASH ZONE SEN
[COMM FAIL] Crash zone sensor is malfunctioning SRC-57, "
DTC
Logic".
B1036 CRASH ZONE SEN
[UNMATCH]
Crash zone sensor is out of the specified specification SRC-59, "
DTC
Logic".
B1037
B1039
B1041 CRASH ZONE SEN1 Crash zone
sensor is malfunctioning SRC-60, "
DTC
Logic".
B1042-B1047 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-62, "
DTC
Logic".
B1049
B1054 DRIVER AIRBAG MODULE
[OPEN]
Driver air bag module circuit is open (including the spiral cable)
SRC-63, "
DTC
Logic".
Revision: 2010 May2011 QX56

DIAGNOSIS SENSOR UNITSRC-23
< ECU DIAGNOSIS INFORMATION >
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B1050
B1055 DRIVER AIRBAG MODULE
[VB-SHORT] Driver air bag module circuit is shorted to power supply circuit
(including the spiral cable) SRC-65, "DTC
Logic".
B1051
B1056 DRIVER AIRBAG MODULE
[GND-SHORT] Driver air bag module circuit is shorted to ground (including the
spiral cable) SRC-67, "
DTC
Logic".
B1052
B1057 DRIVER AIRBAG MODULE
[SHORT] Driver air bag module circuits are shorted to each other (includ-
ing spiral cable) SRC-69, "
DTC
Logic".
B1058-B1063 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-71, "
DTC
Logic".
B1065
B1070 ASSIST A/B MODULE
[OPEN]
Passenger air bag module circuit is open SRC-72, "
DTC
Logic".
B1066
B1071 ASSIST A/B MODULE
[VB-SHORT] Passenger air bag module circuit is shorted to power supply
circuit SRC-74, "
DTC
Logic".
B1067
B1072 ASSIST A/B MODULE
[GND-SHORT]
Passenger air bag module circuit is shorted to ground SRC-76, "
DTC
Logic".
B1068
B1073 ASSIST A/B MODULE
[SHORT]
Passenger air bag module circuits are shorted to each other SRC-78, "
DTC
Logic".
B1074-B1079 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-80, "
DTC
Logic".
B1080
B1096 DRIVER AIRBAG MODULE
[SHORT] Driver air bag module circuits are shorted to each other (includ-
ing spiral cable) SRC-81, "
DTC
Logic".
B1081 PRE-TEN FRONT RH
[OPEN]
Seat belt pre-tensioner RH circuit is open SRC-83, "
DTC
Logic".
B1082 PRE-TEN FRONT RH
[VB-SHORT] Seat belt pre-tensioner RH circuit is shorted to power supply
circuit SRC-85, "
DTC
Logic".
B1083 PRE-TEN FRONT RH
[GND-SHORT] Seat belt pre-tensioner RH circuit is shorted to ground SRC-87, "
DTC
Logic".
B1084 PRE-TEN FRONT RH
[SHORT]
Seat belt pre-tensioner RH circuits are shorted to each other SRC-89, "
DTC
Logic".
B1086 PRE-TEN FRONT LH
[OPEN] Seat belt pre-tensioner LH circuit is open
SRC-91, "
DTC
Logic".
B1087 PRE-TEN FRONT LH
[VB-SHORT] Seat belt pre-tensioner LH circuit is shorted to power supply
circuit SRC-93, "
DTC
Logic".
B1088 PRE-TEN FRONT LH
[GND-SHORT]
Seat belt pre-tensioner LH circuit is shorted to ground SRC-95, "
DTC
Logic".
B1089 PRE-TEN FRONT LH
[SHORT]
Seat belt pre-tensioner LH circuits are shorted to each other SRC-97, "
DTC
Logic".
B1090-B1095 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-99, "
DTC
Logic".
B 11 0 6 - B 1111 C O N T R O L U N I T A i r b a g d i a g n o s i s s e n s o r u n i t i s m a l f u n c t i o n i n g SRC-100, "
DTC
Logic".
B 111 3
B 111 4 SATELLITE SENS RH
[UNIT FAIL]
Front satellite sensor RH is malfunctioning SRC-101, "
DTC
Logic".
B 111 5 SATELLITE SENS RH
[COMM FAIL] Front satellite sensor RH is malfunctioning
SRC-103, "
DTC
Logic".
B 111 6 SATELLITE SENS RH
[UNMATCH] Front satellite sensor RH is out of the specified specification SRC-105, "
DTC
Logic".
B 111 8
B 111 9 SATELLITE SENS LH
[UNIT FAIL]
Front satellite sensor LH is malfunctioning SRC-106, "
DTC
Logic".
B1120 SATELLITE SENS LH
[COMM FAIL] Front satellite sensor LH is malfunctioning
SRC-108, "
DTC
Logic".
B1121 SATELLITE SENS LH
[UNMATCH] Front satellite sensor LH is out of the specified specification SRC-110, "
DTC
Logic".
DTC Diagnostic item Explanation Reference page
Revision: 2010 May2011 QX56

SRC-24
< ECU DIAGNOSIS INFORMATION >
DIAGNOSIS SENSOR UNIT
B1122-B1127 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioningSRC-111, "DTC
Logic".
B1129 SIDE MODULE RH
[OPEN]
Side air bag module RH circuit is open SRC-112, "
DTC
Logic".
B1130 SIDE MODULE RH
[VB-SHORT] Side air bag module RH circuit is shorted to power supply cir-
cuit SRC-114, "
DTC
Logic".
B1131 SIDE MODULE RH
[GND-SHORT] Side air bag module RH circuit is shorted to ground SRC-116, "
DTC
Logic".
B1132 SIDE MODULE RH
[SHORT]
Side air bag module RH circuits are shorted to each other SRC-118, "
DTC
Logic".
B1134 SIDE MODULE LH
[OPEN] Side air bag module LH circuit is open
SRC-120, "
DTC
Logic".
B1135 SIDE MODULE LH
[VB-SHORT] Side air bag module LH circuit is shorted to power supply circuit SRC-122, "
DTC
Logic".
B1136 SIDE MODULE LH
[GND-SHORT]
Side air bag module LH circuit is shorted to ground SRC-124, "
DTC
Logic".
B1137 SIDE MODULE LH
[SHORT] Side air bag module LH circuits are shorted to each other
SRC-126, "
DTC
Logic".
B1138-B1143 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-128, "
DTC
Logic"
B1144CONTROL UNIT
[MISS INSTALLATION] Air bag diagnosis sensor unit is malfunctioning or out of the
specified specification SRC-129, "DTC
Logic".
B1145 CURTAIN MODULE RH
[OPEN] Rear curtain air bag module RH circuit is open
SRC-130, "
DTC
Logic".
B1146 CURTAIN MODULE RH
[VB-SHORT] Rear curtain air bag module RH circuit is shorted to power sup-
ply circuit SRC-132, "
DTC
Logic".
B1147 CURTAIN MODULE RH
[GND-SHORT]
Rear curtain air bag module RH circuit is shorted to ground SRC-134, "
DTC
Logic".
B1148 CURTAIN MODULE RH
[SHORT] Rear curtain air bag module RH circuits are shorted to each
other SRC-136, "
DTC
Logic".
B1150 CURTAIN MODULE LH
[OPEN] Rear curtain air bag module LH circuit is open SRC-138, "
DTC
Logic".
B1151 CURTAIN MODULE LH
[VB-SHORT] Rear curtain air bag module LH circuit is shorted to power sup-
ply circuits SRC-140, "
DTC
Logic".
B1152 CURTAIN MODULE LH
[GND-SHORT]
Rear curtain air bag module LH circuit is shorted to ground SRC-142, "
DTC
Logic".
B1153 CURTAIN MODULE LH
[SHORT] Rear curtain air bag module LH circuits are shorted to each
other SRC-144, "
DTC
Logic".
B1154-B1159 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-146, "
DTC
Logic".
B1170-B1175 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-147, "
DTC
Logic".
B1177 PRE-TEN2 FRONT RH
[OPEN] Lap pre-tensioner RH circuit is open
SRC-148, "
DTC
Logic"
B1178PRE-TEN2 FRONT RH
[VB-SHORT] Lap pre-tensioner RH circuit is shorted to power supply circuit SRC-149, "DTC
Logic"
B1179PRE-TEN2 FRONT RH
[GND-SHORT]
Lap pre-tensioner RH circuit is shorted to ground SRC-150, "DTC
Logic"
B1180
PRE-TEN2 FRONT RH
[SHORT] Lap pre-tensioner RH circuits are shorted to each other
SRC-151, "DTC
Logic"
B1182PRE-TEN2 FRONT LH
[OPEN] Lap pre-tensioner LH circuit is open SRC-152, "DTC
Logic"
DTC Diagnostic item Explanation Reference page
Revision: 2010 May2011 QX56

DIAGNOSIS SENSOR UNITSRC-25
< ECU DIAGNOSIS INFORMATION >
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B1183 PRE-TEN2 FRONT LH
[VB-SHORT] Lap pre-tensioner LH circuit is shorted to power supply circuit SRC-153, "DTC
Logic"
B1184PRE-TEN2 FRONT LH
[GND-SHORT]
Lap pre-tensioner LH circuit is shorted to ground SRC-154, "DTC
Logic"
B1185
PRE-TEN2 FRONT LH
[SHORT] Lap pre-tensioner LH circuits are shorted to each other
SRC-155, "DTC
Logic"
B1186-B1191 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-156, "DTC
Logic".
B1193 CURTAIN MODULE RH
[OPEN]
Front curtain air bag module RH circuit is open SRC-157, "
DTC
Logic"
B1194
CURTAIN MODULE RH
[VB-SHORT] Front curtain air bag module RH circuit is shorted to power sup-
ply circuit SRC-159, "DTC
Logic"
B1195
CURTAIN MODULE RH
[GND-SHORT] Front curtain air bag module RH circuit is shorted to ground SRC-161, "DTC
Logic"
B1196CURTAIN MODULE RH
[SHORT] Front curtain air bag module RH circuits are shorted to each
other SRC-163, "DTC
Logic"
B1198
CURTAIN MODULE LH
[OPEN] Front curtain air bag module LH circuit is open
SRC-165, "DTC
Logic"
B1199CURTAIN MODULE LH
[VB-SHORT] Front curtain air bag module LH circuit is shorted to power sup-
ply circuits SRC-167, "DTC
Logic"
B1200
CURTAIN MODULE LH
[GND-SHORT]
Front curtain air bag module LH circuit is shorted to ground SRC-169, "DTC
Logic"
B1201
CURTAIN MODULE LH
[SHORT] Front curtain air bag module LH circuits are shorted to each
other SRC-171, "DTC
Logic"
B1202-B1207 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning
SRC-173, "DTC
Logic".
B1209 FRONTAL COLLISION DETEC-
TION Seat belt pre-tensioner, driver air bag and passenger air bag
are deployed SRC-174, "
De-
scription".
B1210 SIDE COLLISION DETECTION Side air bag, curtain air bag and seat belt pre-tensione are de-
ployed SRC-175, "
DTC
Logic".
B1211 ROLLOVER DETECTION Curtain air bag and seat belt pre-tensione are deployed SRC-176, "
DTC
Logic"
B1212-B1214 RH1 SAT-SENS Satellite sensor RH is malfunctioning SRC-177, "DTC
Logic".
B1215-B1217 LH1 SAT-SENS Satellite sensor LH is malfunctioning SRC-179, "
DTC
Logic".
B1218-B1223 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-181, "
DTC
Logic".
B1234-B1239 CONTROL UNIT Air bag diagnosis sensor unit is malfunctioning SRC-182, "
DTC
Logic"
B1304SATELLITE SENS RH
[UNIT FAIL]
Rear satellite sensor RH is malfunctioning SRC-183, "DTC
Logic"
B1306
B1308
B1309
B1310SATELLITE SENS RH
[COMM FAIL]
Rear satellite sensor RH is malfunctioning SRC-185, "
DTC
Logic"
B1307SATELLITE SENS RH
[UNMATCH] Rear satellite sensor RH is out of the specified specification
SRC-187, "DTC
Logic"
B1311SATELLITE SENS LH
[UNIT FAIL] Rear satellite sensor LH is malfunctioning SRC-188, "DTC
Logic"
DTC Diagnostic item Explanation Reference page
Revision: 2010 May2011 QX56

SRC-26
< ECU DIAGNOSIS INFORMATION >
DIAGNOSIS SENSOR UNIT
B1313
B1315
B1316
B1317SATELLITE SENS LH
[COMM FAIL]
Rear satellite sensor LH is malfunctioning SRC-190, "
DTC
Logic"
B1314
SATELLITE SENS LH
[UNMATCH] Rear satellite sensor LH is out of the specified specification SRC-192, "DTC
Logic"
DTC Diagnostic item Explanation Reference page
Revision: 2010 May2011 QX56

STEERING SHAFTST-37
< REMOVAL AND INSTALLATION >
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STEERING SHAFT
Exploded ViewINFOID:0000000006225604
Removal and InstallationINFOID:0000000006225605
REMOVAL
1. Set vehicle to the straight-ahead position.
2. Fix the steering wheel.
3. Remove steering shaft fixing bolt and nut (lower joint side). CAUTION:
The steering shaft bellows are easily bent. N ever press the bellows too much with a tool.
4. Remove lower joint fixing bolt (steering gear side).
5. Remove lower joint from steering shaft and steering gear assembly. CAUTION:
 When removing lower joint, n ever insert a tool, such as a screw driver, into the yoke groove to
pull out the lower joint. In case of the violation of the above, replace lower joint with a new one.
 Spiral cable may be cut if steering wheel tu rns while separating steering column assembly and
steering gear assembly. Be sure to secure st eering wheel using string to avoid turning.
6. Turn carpet and remove the hole cover mounting nuts.
7. Remove the upper joint fixing bolt and nut (steering shaft side).
1. Lower joint 2. Steering shaft 3. Hole cover*
4. Clamp* 5. Hole cover seal 6. Collar
7. Upper joint
*: Replace “3” and “4” as a set.
Refer to GI-4, "
Components" for symbols in the figure.
JPGIA0067GB
Revision: 2010 May2011 QX56