Remote Keyless Entry Receiver System Check

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

REMOTE KEYLESS ENTRY RECEIVER SIGNAL
Check signal voltage waveform between BCM connector M18 terminal 20 and ground using an oscilloscope.

Condition:

Keyfob buttons released : Refer to " TERMINALS AND REFERENCE VALUE FOR BCM " .

Keyfob buttons pressed : Refer to " TERMINALS AND REFERENCE VALUE FOR BCM " .

Fig 1: Checking Signal Voltage Waveform Between BCM Connector M18 Terminal 20 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK : Remote keyless entry receiver signal power supply, ground and signal circuits are OK. Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".
- NG : GO TO 2.
REMOTE KEYLESS ENTRY RECEIVER POWER SUPPLY INSPECTION
Check signal voltage waveform between BCM connector M18 terminal 19 and ground using an oscilloscope.

19 (V/W) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR BCM " .

OK or NG
- OK : GO TO 3.
- NG : Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".
  
  Fig 2: Checking Signal Voltage Waveform Between BCM Connector M18 Terminal 19 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
REMOTE KEYLESS ENTRY RECEIVER GROUND CIRCUIT INSPECTION (BCM)
Check continuity between BCM connector M18 terminal 18 and ground.

18 (P) - Ground : Continuity should exist .

OK or NG
- OK : GO TO 4.
- NG : Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".
  
  Fig 3: Checking Continuity Between BCM Connector M18 Terminal 18 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
HARNESS INSPECTION BETWEEN BCM AND REMOTE KEYLESS ENTRY RECEIVER
1. Disconnect remote keyless entry receiver and BCM connectors.
2. Check continuity between remote keyless entry receiver connector M120 terminals 1, 2, 4 and BCM connector M18 terminals 18, 19, 20.
  1 (P) - 18 (P) : Continuity should exist .
  
  2 (G/W) - 20 (G/W) : Continuity should exist .
  
  4 (V/W) - 19 (V/W) : Continuity should exist .
3. Check continuity between remote keyless entry receiver terminals 1, 2 and 4 and ground.
  1 (P) - Ground : Continuity should not exist .
  
  2 (G/W) - Ground : Continuity should not exist .
  
  4 (V/W) - Ground : Continuity should not exist .
  
  Fig 4: Checking Continuity Between Remote Keyless Entry Receiver Connector M120 Terminals 1, 2, 4 And BCM Connector M18 Terminals 18, 19, 20 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK : Replace remote keyless entry receiver.
- NG : Repair or replace harness.