A Communication Line Check

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

Check A Switch Circuit

Turn ignition switch OFF.
Disconnect display unit connector and A switch connector.

Check continuity between display unit and A switch.

CHECK CONTINUITY

Terminals				Continuity
Display unit		AV switch
Connector	Terminal (Wire color)	Connector	Terminal (Wire color)
M93	11 (V)	M98	6(V)	Yes
	13 (L/G)		8 (L/G)
	12		7

Check continuity between display unit and ground.

CHECK CONTINUITY

Terminals			Continuity
Connector	Terminal (Wire color)	Terminal
M93	11 (V)	Ground	No
	13 (L/G)

OK or NG

OK: GO TO 2.
NG: Replace harness.

Fig 1: Checking Continuity Between Display Unit And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK A COMMUNICATION SIGNAL
1. Connect display unit connector and A switch connector.
2. Turn ignition switch ON.
3. Check the signal between display unit harness connector M93 terminals 11 (V), 13 (L/G) and ground with CONSULT-II or oscilloscope.
1. 11 (V), 13 (L/G) - Ground: Refer to "Terminals And Reference Value For Display Unit ".
OK or NG
1. OK: Replace A switch. Refer to "REMOVAL AND INSTALLATION FOR A SWITCH ".
2. NG: Replace display unit. Refer to "Removal And Installation Of Display Unit ".
  
  Fig 2: Checking Signal Between Display Unit Harness Connector M93 Terminals 11
  Courtesy of NISSAN MOTOR CO., U.S.A.