Audio Communication Line Check (With Monochrome Display)

WARNING: This page is about a different car, the 2007 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS

Turn ignition switch OFF.
Disconnect audio unit connector M45 and display unit connector M93.

Check continuity between audio unit and display unit.

TERMINALS CONTINUITY CHART

C		A (Base system) B (Mid level system)		Continuity
Connector	Terminal	Connector	Terminal	Continuity
Display Unit: M93	8	Audio unit: M45	65	Yes
	10		66
	9		67

Check continuity between display unit and ground.

TERMINALS CONTINUITY CHART

Terminals			Continuity
C		Ground
Connector	Terminal
Display unit: M93	8		No
	10

Fig 1: Checking Continuity Between Display Unit And Ground

OK or NG

OK: GO TO 2.

NG: Repair harness.

CHECK AUDIO TX COMMUNICATION SIGNAL
1. Connect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display unit harness connector M93 terminal 8 and ground.
  Voltage : Approx. 3.5V
OK or NG

OK: GO TO 3.

NG: Replace display unit. Refer to "DISPLAY UNIT ".

Fig 2: Checking Voltage Between Display Unit Connector M93 Terminal 8 And Ground
CHECK AUDIO RX COMMUNICATION SIGNAL
1. Turn ignition switch OFF.
2. Connect audio unit connector.
3. Turn ignition switch ON.
4. Check voltage between audio unit harness connector M45 [(A) with base system or (B) with mid level system] terminal 65 and ground.
  Voltage : Approx. 3.5V
OK or NG

OK: GO TO 4.

NG: Replace audio unit. Refer to "REMOVAL AND INSTALLATION ".

Fig 3: Checking Voltage Between Audio Unit M45 Terminal 65 And Ground
CHECK AUDIO TX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check the signal between audio unit harness connector M45 [(A) with base system or (B) with mid level system] terminal 66 and ground with CONSULT-II or oscilloscope.
  66 - Ground : Refer to "TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT (WITH MONOCHROME DISPLAY) ".
  
  Fig 4: Checking Voltage Between Audio Unit M45 Terminal 66 And Ground
OK or NG

OK: GO TO 5.

NG: Replace audio unit. Refer to "REMOVAL AND INSTALLATION ".
CHECK AUDIO RX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check the signal between display unit harness connector M93 terminal 10 and ground with CONSULT-II or oscilloscope.
  10 - Ground : Refer to "TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT (WITH MONOCHROME DISPLAY) ".
  
  Fig 5: Checking Voltage Between Display Unit Connector M93 Terminal 10 And Ground
OK or NG

OK: Inspection End.

NG: Replace display unit. Refer to "DISPLAY UNIT ".