2004 INFINITI QX56 ignition

CAN SYSTEM (TYPE 1)
LAN-49
[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: August 20072004 QX56
2. CHECK HARNESS FOR SHORT CIRCUIT
With all module and control unit connectors disconnected, check
continuity between data link connector M22 terminals 6 (W) and 14
(R).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.
3. CHECK HARNESS FOR SHORT CIRCUIT
Check continuity between data link connector M22 terminals 6 (W),
14 (R) and ground.
OK or NG
OK >> Check ECM and IPDM E/R. Refer to LAN-49, "ECM/
IPDM E/R INTERNAL CIRCUIT INSPECTION" .
NG >> Repair harness.
IPDM E/R Ignition Relay Circuit CheckUKS0018X
Check the following. If no malfunction is found, replace the IPDM E/R.

IPDM E/R power supply circuit. Refer to PG-27, "IPDM E/R Power/Ground Circuit Inspection" .

Ignition power supply circuit. Refer to PG-13, "IGNITION POWER SUPPLY — IGNITION SW. IN ON
AND/OR START" .
Component InspectionUKS0018Y
ECM/IPDM E/R INTERNAL CIRCUIT INSPECTION

Remove ECM and IPDM E/R from vehicle.

Check resistance between ECM terminals 94 and 86.

Check resistance between IPDM E/R terminals 39 and 40.6 (W) - 14 (R) : Continuity should not exist.
PKIA2077E
6 (W) - Ground : Continuity should not exist.
14 (R) - Ground : Continuity should not exist.
PKIA2079E
Unit TerminalResistance value (Ω)
(Approx.)
ECM 94 - 86
108 - 132
IPDM E/R 39 - 40
LKIA0037E

CAN SYSTEM (TYPE 2)
LAN-77
[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: August 20072004 QX56
Case 19
Check CAN communication circuit. Refer to LAN-88, "CAN Communication Circuit Check" .
Case 20
Check IPDM E/R ignition relay circuit continuously sticks “OFF”. Refer to LAN-89, "IPDM E/R Ignition Relay
Circuit Check" .
PKIA8107E
PKIA8108E

LAN-78
[CAN]
CAN SYSTEM (TYPE 2)
Revision: August 20072004 QX56
Case 21
Check IPDM E/R ignition relay circuit continuously sticks “ON”. Refer to LAN-89, "IPDM E/R Ignition Relay Cir-
cuit Check" .
Circuit Check Between TCM and ICC SensorUKS001N8
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check following terminals and connectors for damage, bend and loose connection (connector side and
harness side).
–Harness connector F33
–Harness connector E19
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect A/T assembly connector and harness connector F33.
2. Check continuity between A/T assembly harness connector F9
terminals 3 (W), 8 (R) and harness connector F33 terminals 12
(W), 11 (R).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.
PKIA8109E
3 (W) - 12 (W) : Continuity should exist.
8 (R) - 11 (R) : Continuity should exist.
PKIA6831E

CAN SYSTEM (TYPE 2)
LAN-79
[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: August 20072004 QX56
3. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC sensor connector.
2. Check continuity between harness connector E19 terminals 12
(W), 11 (R) and ICC sensor connector E42 terminals 2 (W), 3
(R).
OK or NG
OK >> Connect all connectors and diagnose again. Refer to
LAN-55, "
Work Flow" .
NG >> Repair harness.
Circuit Check Between ICC Sensor and ICC UnitUKS001PO
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check following terminals and connectors for damage, bend and loose connection (connector side and
harness side).
–Harness connector E34
–Harness connector B40
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC sensor connector and harness connector E34.
2. Check continuity between ICC sensor connector E42 terminals
2 (W), 3 (R) and harness connector E34 terminals 24 (W), 23
(R).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.
3. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC unit connector.
2. Check continuity between harness connector B40 terminals 24
(W), 23 (R) and ICC unit connector B13 terminals 14 (W), 5 (R).
OK or NG
OK >> Connect all connectors and diagnose again. Refer to
LAN-55, "
Work Flow" .
NG >> Repair harness.12 (W) - 2 (W) : Continuity should exist.
11 (R) - 3 (R) : Continuity should exist.
PKIA8171E
2 (W) - 24 (W) : Continuity should exist.
3 (R) - 23 (R) : Continuity should exist.
PKIA8137E
24 (W) - 14 (W) : Continuity should exist.
23 (R) - 5 (R) : Continuity should exist.
PKIA8138E

LAN-80
[CAN]
CAN SYSTEM (TYPE 2)
Revision: August 20072004 QX56
Circuit Check Between ICC Unit and Driver Seat Control UnitUKS001PP
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Disconnect ICC unit connector and driver seat control unit connector.
4. Check continuity between ICC unit connector B13 terminals 14
(W), 5 (R) and driver seat control unit connector P2 terminals 3
(W), 19 (R).
OK or NG
OK >> Connect all connectors and diagnose again. Refer to
LAN-55, "
Work Flow" .
NG >> Repair harness.
Circuit Check Between Driver Seat Control Unit and Data Link ConnectorUKS001N9
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check following terminals and connectors for damage, bend and loose connection (connector side and
harness side).
–Harness connector B69
–Harness connector M40
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect driver seat control unit connector and harness connector B69.
2. Check continuity between driver seat control unit harness con-
nector P2 terminals 3 (W), 19 (R) and harness connector B69
terminals 51J (W), 52J (R).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.14 (W) - 3 (W) : Continuity should exist.
5 (R) - 19 (R) : Continuity should exist.
PKIA8139E
3 (W) - 51J (W) : Continuity should exist.
19 (R) - 52J (R) : Continuity should exist.
PKIA6841E

CAN SYSTEM (TYPE 2)
LAN-81
[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: August 20072004 QX56
3. CHECK HARNESS FOR OPEN CIRCUIT
Check continuity between harness connector M40 terminals 51J
(W), 52J (R) and data link connector M22 terminals 6 (W), 14 (R).
OK or NG
OK >> Connect all the connectors and diagnose again. Refer to
LAN-55, "
Work Flow" .
NG >> Repair harness.
Circuit Check Between Data Link Connector and IPDM E/RUKS001NA
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check following terminals and connectors for damage, bend and loose connection (connector side and
harness side).
–Harness connector M31
–Harness connector E152
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect harness connector M31.
2. Check continuity between data link connector M22 terminals 6
(W), 14 (R) and harness connector M31 terminals 31G (W), 42G
(R).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.
3. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect IPDM E/R connector.
2. Check continuity between harness connector E152 terminals
31G (W), 42G (R) and IPDM E/R harness connector E122 termi-
nals 39 (W), 40 (R).
OK or NG
OK >> Connect all the connectors and diagnose again. Refer to
LAN-55, "
Work Flow" .
NG >> Repair harness.51J (W) - 6 (W) : Continuity should exist.
52J (R) - 14 (R) : Continuity should exist.
PKIA6834E
6 (W) - 31G (W) : Continuity should exist.
14 (R) - 42G (R) : Continuity should exist.
PKIA6835E
31G (W) - 39 (W) : Continuity should exist.
42G (R) - 40 (R) : Continuity should exist.
PKIA8140E

LAN-82
[CAN]
CAN SYSTEM (TYPE 2)
Revision: August 20072004 QX56
ECM Circuit CheckUKS001NB
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check following terminals and connectors for damage, bend and loose connection (control module side
and harness side).
–ECM connector
–Harness connector E19
–Harness connector F33
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ECM connector.
2. Check resistance between ECM harness connector E16 termi-
nals 94 (W) and 86 (R).
OK or NG
OK >> Replace ECM.
NG >> Repair harness between ECM and A/T assembly.
TCM Circuit CheckUKS001NC
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of A/T assembly for damage, bend and loose connection (control module
side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect A/T assembly connector.
2. Check resistance between A/T assembly harness connector F9
terminals 3 (W) and 8 (R).
OK or NG
OK >> Replace control valve with TCM.
NG >> Repair harness between A/T assembly and harness
connector F33. 94 (W) - 86 (R) : Approx. 108 - 132Ω
PKIA0816E
3 (W) - 8 (R) : Approx. 54 - 66Ω
SKIA6866E

CAN SYSTEM (TYPE 2)
LAN-83
[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: August 20072004 QX56
ICC Sensor Circuit CheckUKS001PQ
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of ICC sensor for damage, bend and loose connection (sensor side and
harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC sensor connector.
2. Check resistance between ICC sensor harness connector E42
terminals 2 (W) and 3 (R).
OK or NG
OK >> Replace ICC sensor.
NG >> Repair harness between ICC sensor and harness con-
nector E34.
ICC Unit Circuit CheckUKS001PR
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of ICC unit for damage, bend and loose connection (control unit side and
harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC unit connector.
2. Check resistance between ICC unit harness connector B13 ter-
minals 14 (W) and 5 (R).
OK or NG
OK >> Replace ICC unit.
NG >> Repair harness between ICC unit and harness connec-
tor B69. 2 (W) - 3 (R) : Approx. 54 - 66Ω
PKIA8172E
14 (W) - 5 (R) : Approx. 54 - 66Ω
SKIA6886E