Case 22 Infiniti QX56 I

Case 22

Check IPDM E/R ignition relay circuit continuously sticks "ON". Refer to " IPDM E/R IGNITION RELAY CIRCUIT CHECK ".

Scheme 451

Scheme 452

Scheme 453

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. 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 Disconnect A/T assembly connector and harness connector F33. Check continuity between A/T assembly harness connector F9 terminals 3 (L), 8 (P) and harness connector F33 terminals 12 (L), 11 (P). 3 (L) - 12 (L): Continuity should exist. 8 (P) - 11 (P): Continuity should exist. OK or NG OK: GO TO 3. NG: Repair harness.
3. CHECK HARNESS FOR OPEN CIRCUIT Disconnect ICC sensor connector. Check continuity between harness connector E19 terminals 12 (L), 11 (P) and ICC sensor connector E42 terminals 2 (L), 3 (P). 12 (L) - 2 (L): Continuity should exist. 11 (P) - 3 (P): Continuity should exist. OK or NG OK: Connect all connectors and diagnose again. Refer to " «WORK FLOW»(ref-230070-S12968453572006042700000) ". NG: Repair harness.

Scheme 454

Scheme 455

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. 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 Disconnect ICC sensor connector and harness connector E34. Check continuity between ICC sensor connector E42 terminals 2 (L), 3 (P) and harness connector E34 terminals 24 (L), 23 (P). 2 (L) - 24 (L): Continuity should exist. 3 (P) - 23 (P): Continuity should exist. OK or NG OK: GO TO 3. NG: Repair harness.
3. CHECK HARNESS FOR OPEN CIRCUIT Disconnect ICC unit connector. Check continuity between harness connector B40 terminals 24 (L), 23 (P) and ICC unit connector B13 terminals 14 (L), 5 (P). 24 (L) - 14 (L): Continuity should exist. 23 (P) - 5 (P): Continuity should exist. OK or NG OK: Connect all the connectors and diagnose again. Refer to " «WORK FLOW»(ref-230070-S12968453572006042700000) ". NG: Repair harness.

Scheme 456

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Disconnect ICC unit connector and driver seat control unit connector. Check continuity between ICC unit connector B13 terminals 14 (L), 5 (P) and driver seat control unit connector P2 terminals 3 (L), 19 (P). 14 (L) - 3 (L): Continuity should exist. 5 (P) - 19 (P): Continuity should exist. OK or NG OK: Connect all the connectors and diagnose again. Refer to " «WORK FLOW»(ref-230070-S12968453572006042700000) ". NG: Repair harness.

Scheme 457

Scheme 458

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. 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 Disconnect driver seat control unit connector and harness connector B69. Check continuity between driver seat control unit harness connector P2 terminals 3 (L), 19 (P) and harness connector B69 terminals 51J (L), 52J (P). 3 (L) - 51J (L): Continuity should exist. 19 (P) - 52J (P): Continuity should exist. OK or NG OK: GO TO 3. NG: Repair harness.
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). 51J (L) - 6 (L): Continuity should exist. 52J (P) - 14 (P): Continuity should exist. OK or NG OK: Connect all the connectors and diagnose again. Refer to " «WORK FLOW»(ref-230070-S12968453572006042700000) ". NG: Repair harness.

Scheme 459

Scheme 460

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. 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 Disconnect harness connector M31. Check continuity between data link connector M22 terminals 6 (L), 14 (P) and harness connector M31 terminals 31G (L), 42G (P). 6 (L) - 31G (L): Continuity should exist. 14 (P) - 42G (P): Continuity should exist. OK or NG OK: GO TO 3. NG: Repair harness.
3. CHECK HARNESS FOR OPEN CIRCUIT Disconnect IPDM E/R connector. Check continuity between harness connector E152 terminals 31G (L), 42G (P) and IPDM E/R harness connector E122 terminals 39 (L), 40 (P). 31G (L) - 39 (L): Continuity should exist. 42G (P) - 40 (P): Continuity should exist. OK or NG OK: Connect all the connectors and diagnose again. Refer to " «WORK FLOW»(ref-230070-S12968453572006042700000) ". NG: Repair harness.

Scheme 461

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. 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 Disconnect ECM connector. Check resistance between ECM harness connector E16 terminals 94 (L) and 86 (P). 94 (L) - 86 (P): Approx. 108 - 132ohm OK or NG OK: Replace ECM. NG: Repair harness between ECM and A/T assembly.

Scheme 462

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. 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 Disconnect A/T assembly connector. Check resistance between A/T assembly harness connector F9 terminals 3 (L) and 8 (P). 3 (L) - 8 (P): Approx. 54 - 66ohm OK or NG OK: Replace control valve with TCM. NG: Repair harness between A/T assembly and harness connector F33.

Scheme 463

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. 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 Disconnect ICC sensor connector. Check resistance between ICC sensor harness connector E42 terminals 2 (L) and 3 (P). 2 (L) - 3 (P): Approx. 54 - 66ohm OK or NG OK: Replace ICC sensor. NG: Repair harness between ICC sensor and harness connector E34.

Scheme 464

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. 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 Disconnect ICC unit connector. Check resistance between ICC unit harness connector B13 terminals 14 (L) and 5 (P). 14 (L) - 5 (P): Approx. 54 - 66ohm OK or NG OK: Replace ICC unit. NG: Repair harness between ICC unit and harness connector B69.

Scheme 465

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check following terminals and connectors for damage, bend and loose connection (control unit side and harness side). - Driver seat control unit connector - Harness connector P1 - Harness connector B37 OK or NG OK: GO TO 2. NG: Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect driver seat control unit connector. Check resistance between driver seat control unit harness connector P2 terminals 3 (L) and 19 (P). 3 (L) - 19 (P): Approx. 54 - 66ohm OK or NG OK: Replace driver seat control unit. NG: Repair harness between driver seat control unit and harness connector B69.

Scheme 466

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check terminals and connector of combination meter for damage, bend and loose connection (meter side and harness side). OK or NG OK: GO TO 2. NG: Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect combination meter connector. Check resistance between combination meter harness connector M24 terminals 11 (L) and 12 (P). 11 (L) - 12 (P): Approx. 54 - 66ohm OK or NG OK: Replace combination meter. NG: Repair harness between combination meter and data link connector.

Scheme 467

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check terminals and connector of display control 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 Disconnect display control unit connector. Check resistance between display control unit harness connector M95 terminals 25 (L) and 26 (P). 25 (L) - 26 (P): Approx. 54 - 66ohm OK or NG OK: Replace display control unit. NG: Repair harness between display control unit and data link connector.

Scheme 468

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check terminals and connector of BCM 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 Disconnect BCM connector. Check resistance between BCM harness connector M18 terminals 39 (L) and 40 (P). 39 (L) - 40 (P): Approx. 54 - 66ohm OK or NG OK: Replace BCM. Refer to " «REMOVAL AND INSTALLATION OF BCM»(ref-230069-S26270808902006042700000) ". NG: Repair harness between BCM and data link connector.

Scheme 469

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check terminals and connector of data link connector for damage, bend and loose connection (connector side and harness side). OK or NG OK: GO TO 2. NG: Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Check resistance between data link connector M22 terminals 6 (L) and 14 (P). 6 (L) - 14 (P): Approx. 54 - 66ohm OK or NG OK: Diagnose again. Refer to " «WORK FLOW»(ref-230070-S12968453572006042700000) ". NG: Repair harness between data link connector and combination meter.

Scheme 470

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check terminals and connector of steering angle 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 Disconnect steering angle sensor connector. Check resistance between steering angle sensor harness connector M47 terminals 3 (L) and 4 (P). 3 (L) - 4 (P): Approx. 54 - 66ohm OK or NG OK: Replace steering angle sensor. NG: Repair harness between steering angle sensor and data link connector.

Scheme 471

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check terminals and connector of front air control for damage, bend and loose connection (unit side and harness side). OK or NG OK: GO TO 2. NG: Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect front air control connector. Check resistance between front air control harness connector M50 terminals 34 (L) and 35 (P). 34 (L) - 35 (P): Approx. 54 - 66ohm OK or NG OK: Replace front air control. NG: Repair harness between front air control and data link connector.

Scheme 472

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check terminals and connector of transfer control 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 Disconnect transfer control unit connector. Check resistance between transfer control unit harness connector E142 terminals 7 (L) and 8 (P). 7 (L) - 8 (P): Approx. 54 - 66ohm OK or NG OK: Replace transfer control unit. NG: Repair harness between transfer control unit and harness connector E152.

Scheme 473

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check terminals and connector of ABS actuator and electric unit (control 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 Disconnect ABS actuator and electric unit (control unit) connector. Check resistance between ABS actuator and electric unit (control unit) harness connector E125 terminals 11 (L) and 15 (P). 11 (L) - 15 (P): Approx. 54 - 66ohm OK or NG OK: Replace ABS actuator and electric unit (control unit). NG: Repair harness between ABS actuator and electric unit (control unit) and harness connector E152.

Scheme 474

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Check terminals and connector of IPDM E/R 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 Disconnect IPDM E/R connector. Check resistance between IPDM E/R harness connector E122 terminals 39 (L) and 40 (P). 39 (L) - 40 (P): Approx. 108 - 132ohm OK or NG OK: Replace IPDM E/R. NG: Repair harness between IPDM E/R and harness connector E152.

Scheme 475

Scheme 476

1. CHECK CONNECTOR Turn ignition switch OFF. Disconnect the negative battery terminal. Disconnect the following module and control unit connectors and check terminals for deformation, disconnection, looseness or damage. ECM A/T assembly ICC sensor ICC unit Driver seat control unit Combination meter Display control unit BCM Steering angle sensor Front air control Transfer control unit ABS actuator and electric unit (control unit) IPDM E/R OK or NG OK: GO TO 2. NG: Repair or replace as necessary.
2. CHECK HARNESS FOR SHORT CIRCUIT With all module and control unit connectors disconnected, check continuity between data link connector M22 terminals 6 (L) and 14 (P). 6 (L) - 14 (P): Continuity should not exist. 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 (L), 14 (P) and ground. 6 (L) - Ground: Continuity should not exist. 14 (P) - Ground: Continuity should not exist. OK or NG OK: Check ECM and IPDM E/R. Refer to " «ECM/IPDM E/R INTERNAL CIRCUIT INSPECTION»(ref-230070-S13587157252006042700000) ". NG: Repair harness.

Check the following. If no malfunction is found, replace the IPDM E/R.

1. IPDM E/R power supply circuit. Refer to " «IPDM E/R POWER/GROUND CIRCUIT INSPECTION»(ref-230073-S42137943222006042700000) ".
2. Ignition power supply circuit. Refer to " «IGNITION POWER SUPPLY - IGNITION SW. IN ON AND/OR START»(ref-230073-S37319044182006042700000) ".

Scheme 477

Scheme 478

1. Remove ECM and IPDM E/R from vehicle.
2. Check resistance between ECM terminals 94 and 86.
3. Check resistance between IPDM E/R terminals 39 and 40.