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Lan System (CAN): Diagnosis Nissan Note E12

Communication Devices 4 illustrations ~3108 words

Precautions for Trouble Diagnosis

CAUTIONFollow the instructions listed below. Failure to do this may cause damage to parts: Never apply 7.0 V or more to the measurement terminal. Use a tester with open terminal voltage of 7.0 V or less. Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when checking the harness.

Scheme 25

Scheme 25: Precautions for Harness Repair
Scheme 25: Precautions for Harness Repair

Scheme 26

Scheme 26
Scheme 26
  1. Solder the repaired area and wrap tape around the soldered area. NOTE: A fray of twisted lines must be within 110 mm (4.33 in).
  2. Bypass connection is never allowed at the repaired area. NOTE: Bypass connection may cause CAN communication error. The spliced wire becomes separated and the characteristics of twisted line are lost.
  3. Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communication line.

Scheme 27

Scheme 27: Component Parts Location
Scheme 27: Component Parts Location

Scheme 28

Scheme 28: SYSTEM DIAGRAM
Scheme 28: SYSTEM DIAGRAM

Diagnosis Procedure

  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the following terminals and connectors for damage, bend and loose connection (connector side and harness side). Harness connector E7 Harness connector M69 Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Disconnect the following harness connectors. IPDM E/R Harness connectors E7 and M69 Check the continuity between the IPDM E/R harness connector and the harness connector. IPDM E/R harness connector Harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. E46 62 E7 21A Existed 61 20A Existed Is the inspection result normal? YES: GO TO 3. NO: Repair the main line between the IPDM E/R and the harness connector E7.
  3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Check the continuity between the harness connector and the data link connector. Harness connector Data link connector Continuity Connector No. Terminal No. Connector No. Terminal No. M69 21A M22 6 Existed 20A 14 Existed Is the inspection result normal? YES (Present error): Check CAN system type decision again. YES (Past error): Error was detected in the main line between the IPDM E/R and the data link connector. NO: Repair the main line between the harness connector M69 and the data link connector.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the following terminals and connectors for damage, bend and loose connection (connector side and harness side). Harness connector E7 Harness connector M69 Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Disconnect the following harness connectors. IPDM E/R Harness connectors E7 and M69 Check the continuity between the IPDM E/R harness connector and the harness connector. IPDM E/R harness connector Harness connector Continuity Connector No. Terminal No. Connector No. Terminal No. E46 62 E7 21A Existed 61 20A Existed Is the inspection result normal? YES: GO TO 3. NO: Repair the main line between the IPDM E/R and the harness connector E7.
  3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Disconnect the connector of around view monitor control unit. Check the continuity between the harness connector and the around view monitor control unit harness connector. Harness connector Around view monitor control unit Continuity Connector No. Terminal No. Connector No. Terminal No. M69 21A B54 12 Existed 20A 10 Existed Is the inspection result normal? YES (Present error): Check CAN system type decision again. YES (Past error): Error was detected in the main line between the harness connector M69 and the around view monitor control unit. NO: Repair the main line between the harness connector M69 and the around view monitor control unit.
  1. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Disconnect the following harness connectors. ECM Around view monitor control unit Date link connector Check the continuity between the around view monitor control unit harness connector and the data link connector. Around view monitor control unit Date link connector Continuity Connector No. Terminal No. Connector No. Terminal No. B54 12 M22 6 Existed 10 14 Existed Is the inspection result normal? YES (Present error): Check CAN system type decision again. YES (Past error): Error was detected in the main line between the around view monitor control unit and the data link connector. NO: Repair the main line between the around view monitor control unit and the data link connector.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the ECM for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of ECM. Check the resistance between the ECM harness connector terminals. ECM harness connector Resistance (ohms) Connector No. Terminal No. E16 84 83 Approx. 108 - 132 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the ECM branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the ECM. Refer to " «DIAGNOSIS PROCEDURE»(ref-675586-S09860826282014120500000) ". Is the inspection result normal? YES (Present error): Replace the ECM. Refer to " «REMOVAL AND INSTALLATION»(ref-675586-S42271679082014120500000) ". YES (Past error): Error was detected in the ECM branch line. NO: Repair the power supply and the ground circuit.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the ABS actuator and electric unit (control unit) for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of ABS actuator and electric unit (control unit). Check the resistance between the ABS actuator and electric unit (control unit) harness connector terminals. ABS actuator and electric unit (control unit) harness connector Resistance (ohms) Connector No. Terminal No. E33 11 10 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the ABS actuator and electric unit (control unit) branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the ABS actuator and electric unit (control unit). Refer to " «DIAGNOSIS PROCEDURE»(ref-675599-S03150143302014120500000) ". Is the inspection result normal? YES (Present error): Replace the ABS actuator and electric unit (control unit). Refer to " «REMOVAL AND INSTALLATION»(ref-675599-S01875700792014120500000) ". YES (Past error): Error was detected in the ABS actuator and electric unit (control unit) branch line. NO: Repair the power supply and the ground circuit.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the IPDM E/R for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of IPDM E/R. Check the resistance between the IPDM E/R harness connector terminals. IPDM E/R harness connector Resistance (ohms) Connector No. Terminal No. E46 62 61 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the IPDM E/R branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the IPDM E/R. Refer to the following. With Intelligent Key system: " «DIAGNOSIS PROCEDURE»(ref-675597-S06098712892014120500000) " Without Intelligent Key system: " «DIAGNOSIS PROCEDURE»(ref-675598-S33370937622014120500000) " Is the inspection result normal? YES (Present error): Replace the IPDM E/R. Refer to the following. With Intelligent Key system: " «REMOVAL AND INSTALLATION»(ref-675597-S28632663882014120500000) " Without Intelligent Key system: " «REMOVAL AND INSTALLATION»(ref-675598-S27210814052014120500000) " YES (Past error): Error was detected in the IPDM E/R branch line. NO: Repair the power supply and the ground circuit.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side). TCM Harness connector F8 Harness connector E8 Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of TCM. Check the resistance between the TCM harness connector terminals. TCM harness connector Resistance (ohms) Connector No. Terminal No. F44 33 23 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the TCM branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the TCM. Refer to " «DIAGNOSIS PROCEDURE»(ref-675588-S00337995052014120500000) ". Is the inspection result normal? YES (Present error): Replace the TCM. Refer to " «REMOVAL AND INSTALLATION»(ref-675588-S20352004222014120500000) ". YES (Past error): Error was detected in the TCM branch line. NO: Repair the power supply and the ground circuit.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side). Around view monitor control unit Harness connector B30 Harness connector M13 Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of around view monitor control unit. Check the resistance between the around view monitor control unit harness connector terminals. Around view monitor control unit harness connector Resistance (ohms) Connector No. Terminal No. B54 12 10 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the around view monitor control unit branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the around view monitor control unit. Refer to " «AROUND VIEW MONITOR CONTROL UNIT: DIAGNOSIS PROCEDURE»(ref-675624-S06616829502014120500000) ". Is the inspection result normal? YES (Present error): Replace the around view monitor control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-675624-S21627058292014120500000) ". YES (Past error): Error was detected in the around view monitor control unit branch line. NO: Repair the power supply and the ground circuit.
WARNINGAlways observe the following items for preventing accidental activation. Before servicing, turn ignition switch OFF, disconnect battery negative terminal, and wait 3 minutes or more. (To discharge backup capacitor.) Never use unspecified tester or other measuring device.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the air bag diagnosis sensor unit for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Replace the main harness.
  2. CHECK AIR BAG DIAGNOSIS SENSOR UNIT Check the air bag diagnosis sensor unit. Refer to " «DIAGNOSIS AND REPAIR WORK FLOW»(ref-675619-S09414032632014120500000) ". Is the inspection result normal? YES: Replace the main harness. NO: Replace parts whose air bag system has a malfunction.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the AV control unit for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of AV control unit. Check the resistance between the AV control unit harness connector terminals. AV control unit harness connector Resistance (ohms) Connector No. Terminal No. M70 8 17 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the AV control unit branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the AV control unit. Refer to " «AV CONTROL UNIT: DIAGNOSIS PROCEDURE»(ref-675624-S20630893472014120500000) ". Is the inspection result normal? YES (Present error): Replace the AV control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-675624-S08785922072014120500000) ". YES (Past error): Error was detected in the AV control unit branch line. NO: Repair the power supply and the ground circuit.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the data link connector for damage, bend and loose connection (connector side and harness side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Check the resistance between the data link connector terminals. Data link connector Resistance (ohms) Connector No. Terminal No. M22 6 14 Approx. 54 - 66 Is the measurement value within the specification? YES (Present error): Check CAN system type decision again. YES (Past error): Error was detected in the data link connector branch line circuit. NO: Repair the data link connector branch line.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the EPS control unit for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of EPS control unit. Check the resistance between the EPS control unit harness connector terminals. EPS control unit harness connector Resistance (ohms) Connector No. Terminal No. M53 2 1 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the EPS control unit branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the EPS control unit. Refer to " «DIAGNOSIS PROCEDURE»(ref-675617-S35362288392014120500000) ". Is the inspection result normal? YES (Present error): Replace the EPS control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-675617-S42556229152014120500000) ". YES (Past error): Error was detected in the EPS control unit branch line. NO: Repair the power supply and the ground circuit.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the combination meter for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of combination meter. Check the resistance between the combination meter harness connector terminals. Combination meter harness connector Resistance (ohms) Connector No. Terminal No. M24 1 2 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the combination meter branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the combination meter. Refer to " «COMBINATION METER: DIAGNOSIS PROCEDURE»(ref-675593-S18739808862014120500000) ". Is the inspection result normal? YES (Present error): Replace the combination meter. Refer to " «UNIT REMOVAL AND INSTALLATION»(ref-675593-S23113115242014120500000) ". YES (Past error): Error was detected in the combination meter branch line. NO: Repair the power supply and the ground circuit.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the steering angle sensor for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of steering angle sensor. Check the resistance between the steering angle sensor harness connector terminals. Steering angle sensor harness connector Resistance (ohms) Connector No. Terminal No. M64 5 2 Approx. 54 - 66 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the steering angle sensor branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the steering angle sensor. Refer to " «WIRING DIAGRAM»(ref-675599-S34212436402014120500000) ". Is the inspection result normal? YES (Present error): Replace the steering angle sensor. Refer to " «REMOVAL AND INSTALLATION»(ref-675599-S31682778692014120500000) ". YES (Past error): Error was detected in the steering angle sensor branch line. NO: Repair the power supply and the ground circuit.
  1. CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect the connector of BCM. Check the resistance between the BCM harness connector terminals. With intelligent key BCM harness connector Resistance (ohms) Connector No. Terminal No. M97 39 40 Approx. 108 - 132 Without intelligent key BCM harness connector Resistance (ohms) Connector No. Terminal No. M18 39 40 Approx. 108 - 132 Is the measurement value within the specification? YES: GO TO 3. NO: Repair the BCM branch line.
  3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the BCM. Refer to the following. With Intelligent Key system: " «DIAGNOSIS PROCEDURE»(ref-675612-S29077941162014120500000) " Without Intelligent Key system: " «DIAGNOSIS PROCEDURE»(ref-675613-S05613501912014120500000) " Is the inspection result normal? YES (Present error): Replace the BCM. Refer to the following. With Intelligent Key system: " «REMOVAL AND INSTALLATION»(ref-675612-S22326735462014120500000) " Without Intelligent Key system: " «REMOVAL AND INSTALLATION»(ref-675613-S40874896552014120500000) " YES (Past error): Error was detected in the BCM branch line. NO: Repair the power supply and the ground circuit.
  1. CONNECTOR INSPECTION Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Disconnect all the unit connectors on CAN communication system. Check terminals and connectors for damage, bend and loose connection. Is the inspection result normal? YES: GO TO 2. NO: Repair the terminal and connector.
  2. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) Check the continuity between the data link connector terminals. Data link connector Continuity Connector No. Terminal No. M22 6 14 Not existed Is the inspection result normal? YES: GO TO 3. NO: Check the harness and repair the root cause.
  3. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) Check the continuity between the data link connector and the ground. Data link connector Ground Continuity Connector No. Terminal No. M22 6 Not existed 14 Not existed Is the inspection result normal? YES: GO TO 4. NO: Check the harness and repair the root cause.
  4. CHECK ECM AND BCM TERMINATION CIRCUIT Remove the ECM and the BCM. Check the resistance between the ECM terminals. ECM Resistance (ohms) Terminal No. 84 83 Approx. 108 - 132 Check the resistance between the BCM terminals. BCM Resistance (ohms) Terminal No. 39 40 Approx. 108 - 132 Is the measurement value within the specification? YES: GO TO 5. NO: Replace the ECM and/or the BCM.
  5. CHECK SYMPTOM Connect all the connectors. Check if the symptoms described in the "Symptom (Results from interview with customer)" are reproduced. Inspection result Reproduced: GO TO 6. Non-reproduced: Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.
  6. CHECK UNIT REPRODUCTION Perform the reproduction test as per the following procedure for each unit. Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Disconnect one of the unit connectors of CAN communication system. NOTE: ECM and BCM have a termination circuit. Check other units first. Connect the battery cable to the negative terminal. Check if the symptoms described in the "Symptom (Results from interview with customer)" are reproduced. NOTE: Although unit-related error symptoms occur, do not confuse them with other symptoms. Inspection result Reproduced: Connect the connector. Check other units as per the above procedure. Non-reproduced: Replace the unit whose connector was disconnected.

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