Check BCM Power Supply and Ground Circuit

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE AND FUSIBLE LINK
- Check 50A fusible link (letter M, located in the fuse and fusible link box).
- Check 15A fuse [No. 22, located in the fuse block (J/B)].
NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

OK or NG
1. OK : GO TO 2.
2. NG : If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to "POWER SUPPLY ROUTING CIRCUIT ".
CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connectors.
3. Check voltage between BCM connectors M4 terminals 42, 55 and ground.
  1. 42 (L/R) - Ground : Battery voltage
  2. 55 (G) - Ground : Battery voltage
Fig 1: Checking Voltage Between BCM Connectors M4 Terminals 42, 55 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : GO TO 3.
2. NG : Repair or replace BCM power supply circuit.
CHECK GROUND CIRCUIT
Check continuity between BCM connectors M4 terminals 49, 52 and ground.
1. 49 (B) - Ground : Continuity should exist.
2. 52 (B) - Ground : Continuity should exist.
Fig 2: Checking Continuity Between BCM Connectors M4 Terminals 49, 52 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : Power supply and ground circuit are OK.
2. NG : Repair or replace BCM ground circuit.