Page 2353 of 3419
LAN-74
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Case 16
Check front air control circuit. Refer to LAN-87, "Front Air Control Circuit Check" .
SKIB3471E
PKIA8815E
Page 2354 of 3419
CAN SYSTEM (TYPE 2)
LAN-75
[CAN]
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Revision: October 20052005 QX56
Case 17
Check ABS actuator and electric unit (control unit) circuit. Refer to LAN-87, "ABS Actuator and Electric Unit
(Control Unit) Circuit Check" .
SKIB3472E
PKIA8816E
Page 2355 of 3419
LAN-76
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Case 18
Check IPDM E/R circuit. Refer to LAN-88, "IPDM E/R Circuit Check" .
SKIB3473E
PKIA8817E
Page 2356 of 3419
CAN SYSTEM (TYPE 2)
LAN-77
[CAN]
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Revision: October 20052005 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" .
SKIB3474E
SKIB3475E
Page 2357 of 3419
LAN-78
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 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 (L), 8 (P) and harness connector F33 terminals 12
(L), 11 (P).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.
SKIB3476E
3 (L) - 12 (L) : Continuity should exist.
8 (P) - 11 (P) : Continuity should exist.
PKIA6831E
Page 2358 of 3419
![INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
LAN-79
[CAN]
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Revision: October 20052005 QX56
3. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC sensor connector.
2. Check continuity between harness co INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
LAN-79
[CAN]
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Revision: October 20052005 QX56
3. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC sensor connector.
2. Check continuity between harness co](/manual-img/42/57035/w960_57035-2357.png)
CAN SYSTEM (TYPE 2)
LAN-79
[CAN]
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Revision: October 20052005 QX56
3. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC sensor connector.
2. Check continuity between harness connector E19 terminals 12
(L), 11 (P) and ICC sensor connector E42 terminals 2 (L), 3 (P).
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 (L), 3 (P) and harness connector E34 terminals 24 (L), 23 (P).
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
(L), 23 (P) and ICC unit connector B13 terminals 14 (L), 5 (P).
OK or NG
OK >> Connect all connectors and diagnose again. Refer to
LAN-55, "
Work Flow" .
NG >> Repair harness.12 (L) - 2 (L) : Continuity should exist.
11 (P) - 3 (P) : Continuity should exist.
PKIA8171E
2 (L) - 24 (L) : Continuity should exist.
3 (P) - 23 (P) : Continuity should exist.
PKIA8137E
24 (L) - 14 (L) : Continuity should exist.
23 (P) - 5 (P) : Continuity should exist.
PKIA8138E
Page 2359 of 3419
![INFINITI QX4 2005 Factory Service Manual LAN-80
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Circuit Check Between ICC Unit and Driver Seat Control UnitUKS001PP
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the n INFINITI QX4 2005 Factory Service Manual LAN-80
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Circuit Check Between ICC Unit and Driver Seat Control UnitUKS001PP
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the n](/manual-img/42/57035/w960_57035-2358.png)
LAN-80
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 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
(L), 5 (P) and driver seat control unit connector P2 terminals 3
(L), 19 (P).
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 (L), 19 (P) and harness connector B69 ter-
minals 51J (L), 52J (P).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.14 (L) - 3 (L) : Continuity should exist.
5 (P) - 19 (P) : Continuity should exist.
PKIA8139E
3 (L) - 51J (L) : Continuity should exist.
19 (P) - 52J (P) : Continuity should exist.
PKIA6841E
Page 2360 of 3419
![INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
LAN-81
[CAN]
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Revision: October 20052005 QX56
3. CHECK HARNESS FOR OPEN CIRCUIT
Check continuity between harness connector M40 terminals 51J (L),
52J (P) INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
LAN-81
[CAN]
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Revision: October 20052005 QX56
3. CHECK HARNESS FOR OPEN CIRCUIT
Check continuity between harness connector M40 terminals 51J (L),
52J (P)](/manual-img/42/57035/w960_57035-2359.png)
CAN SYSTEM (TYPE 2)
LAN-81
[CAN]
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LAN
Revision: October 20052005 QX56
3. CHECK HARNESS FOR OPEN CIRCUIT
Check continuity between harness connector M40 terminals 51J (L),
52J (P) and data link connector M22 terminals 6 (L), 14 (P).
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
(L), 14 (P) and harness connector M31 terminals 31G (L), 42G
(P).
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 (L), 42G (P) and IPDM E/R harness connector E122 termi-
nals 39 (L), 40 (P).
OK or NG
OK >> Connect all the connectors and diagnose again. Refer to
LAN-55, "
Work Flow" .
NG >> Repair harness.51J (L) - 6 (L) : Continuity should exist.
52J (P) - 14 (P) : Continuity should exist.
PKIA6834E
6 (L) - 31G (L) : Continuity should exist.
14 (P) - 42G (P) : Continuity should exist.
PKIA6835E
31G (L) - 39 (L) : Continuity should exist.
42G (P) - 40 (P) : Continuity should exist.
PKIA8140E