Diagnostic Procedure 1

Self-diagnostic results: 

"CHAIN OF ECM-IMMU" displayed on CONSULT-II screen 

First perform the "SELF-DIAG RESULTS" in "BCM" with CONSULT-II, then perform the trouble diagnosis of malfunction system indicated "SELF-DIAG RESULTS" of "BCM". Refer to " CAN COMMUNICATION INSPECTION USING CONSULT-II  ". 

1. CONFIRM SELF-DIAGNOSTIC RESULTS

   Confirm SELF-DIAGNOSTIC RESULTS "CHAIN OF ECM-IMMU" displayed on CONSULT-II screen.

   NOTE: In rare case, "CHAIN OF ECM-IMMU" might be stored during key registration procedure, even if the system is not malfunctioning.

   Is CONSULT-II screen displayed as above?

   Yes: GO TO  2 .

   No: GO TO "SYMPTOM MATRIX CHART 1  ".

   Fig 1: Diagnostic Procedure 1 - Confirming Self-Diagnostic Result

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK POWER SUPPLY CIRCUIT FOR BCM (NATS CONTROL UNIT)
   1. Disconnect BCM (NATS control unit) connector.
   2. Check voltage between BCM (NATS control unit) connector E105 terminal 7 (R) and ground with CONSULT-II or tester.
      Fig 2: Checking Voltage Between BCM (NATS Control Unit) & Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.

   Battery voltage should exist. 

   OK or NG

   OK: GO TO  3 .

   NG: Check the following.

   • 40A fusible link (letter F  , located in fuse and fusible link box)
   • Harness for open or short between fuse and BCM (NATS control unit) connector

   Ref. Part No. C1 

3. CHECK IGN SW. ON SIGNAL
   1. Turn ignition switch ON.
   2. Check voltage between BCM (NATS control unit) connector M1 terminal 35 (W/L) and ground with CONSULT-II or tester.
      Fig 3: Checking Voltage Between BCM (NATS Control Unit) & Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.

   Battery voltage should exist. 

   OK or NG

   OK: GO TO  4 .

   NG: Check the following.

   • 10A fuse [No. 1, located in the fuse block (J/B)]
   • Harness for open or short between fuse and BCM (NATS control unit) connector

   Ref. part No. C2 

4. CHECK GROUND CIRCUIT FOR BCM (NATS CONTROL UNIT)
   1. Turn ignition OFF.
   2. Check continuity between BCM (NATS control unit) connector E105 terminal 8 (B) and ground.
      Fig 4: Checking Continuity Between BCM (NATS Control Unit) & Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.

   Continuity should exist. 

   OK or NG

   OK: GO TO  5 .

   NG: Repair harness. Ref. part No. C3 

5. REPLACE BCM (NATS CONTROL UNIT)
   1. Replace BCM (NATS control unit) Ref. part No. A 
   2. Perform initialization with CONSULT-II.

      For initialization, refer to "CONSULT-II Operation Manual NATS-IVIS/NVIS".

   Does the engine start?

   Yes: BCM (NATS control unit) is malfunctioning.

   • No: ECM is malfunctioning.
   • Replace ECM. Ref. part No. B 
   • Perform initialization or re-communicating function.
   • For initialization, refer to "CONSULT-II Operation Manual NATS-IVIS/NVIS".
   • For re-communicating function, refer to "ECM RE-COMMUNICATING FUNCTION  ".