Audio Communication Line Check

WARNING: This page is about a different car, the 2004 Nissan Maxima. 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 and display unit connector.

Check continuity between audio unit and display unit.

AUDIO UNIT TERMINALS CONTINUITY SPECIFICATIONS

Terminals				Continuity
Display unit		Audio unit
Connector	Terminal (Wire color)	Connector	Terminal (Wire color)
M93	8(R)	M45	23 (R)	Yes
	10 (L)		21 (L)
	9		25

Fig 1: Checking Continuity Between Display Unit & Ground

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

Check continuity between display unit and ground.

DISPLAY UNIT TERMINALS CONTINUITY SPECIFICATIONS

Terminals			Continuity
Display unit		Ground
Connector	Terminal (Wire color)
M93	8(R)		No
	10 (L)

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 (R) and ground.
Approx. 3.5V

OK or NG
1. OK: GO TO 3.
2. NG: Replace display unit. Refer to CENTER STACK ASSEMBLY .
Fig 2: Checking Voltage Between Display Unit Harness Connector M93 Terminal 8 (R) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK AUDIO RX COMMUNICATION SIGNAL
1. Connect audio unit connector.
2. Turn ignition switch ON.
3. Check voltage between audio unit harness connector M45 terminal 23 (R) and ground.
Approx. 3.5V

OK or NG
1. OK: GO TO 4.
2. NG: Replace audio unit. Refer to REMOVAL AND INSTALLATION OF AUDIO UNIT .
Fig 3: Checking Voltage Between Audio Unit Harness Connector M45 Terminal 23 (R) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK AUDIO TX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check the signal between audio unit harness connector M45 terminal 21 (L) and ground with CONSULT-II or oscilloscope.
1. Approx. 3.5V
OK or NG
1. OK: GO TO 5.
2. NG: Replace audio unit. Refer to REMOVAL AND INSTALLATION OF AUDIO UNIT .
Fig 4: Checking Signal Between Audio Unit Harness Connector Terminal & Ground With CONSULT-II Or Oscilloscope
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK AUDIO RX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check the signal between display unit harness connector M93 terminal 10 (L) and ground with CONSULT-II or oscilloscope.
1. 10 (L) - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT ".
OK or NG
1. OK: INSPECTION END.
2. NG: Replace display unit. Refer to CENTER STACK ASSEMBLY .
Fig 5: Checking Signal Between Display Unit Harness Connector Terminal & Ground With CONSULT-II Or Oscilloscope
Courtesy of NISSAN MOTOR CO., U.S.A.