Audio Communication Line Check (With Monochrome Display Unit)

WARNING: This page is about a different car, the 2006 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.

AUDIO UNIT AND DISPLAY UNIT

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.

DISPLAY UNIT AND GROUND

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

Fig 1: Checking Continuity Between Audio Unit & Display Unit And Display Unit & Ground

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

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
Fig 2: Checking Audio TX Communication Signal
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 3.

NG: Replace display unit. Refer to , "DISPLAY UNIT ".
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
Fig 3: Checking Audio RX Communication Signal
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Replace audio unit. Refer to , "AUDIO UNIT ".
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 UNIT) ".
Fig 4: Checking Audio TX Communication Signal
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 5.

NG: Replace audio unit. Refer to , "AUDIO UNIT ".
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 UNIT) ".
Fig 5: Checking Audio RX Communication Signal
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: Inspection End.

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