WARNING: This page is about a different car, the 2003 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

CHECK POWER SUPPLY AND GROUND CIRCUIT
1. Check system of power supply and ground circuit audio unit. Refer to POWER DISTRIBUTION .
OK or NG
1. OK : GO TO 2.
2. NG : Check the malfunctioning parts.

CHECK HARNESS

Turn ignition switch OFF.
Disconnect audio unit connector and display control unit connector.

Check continuity between audio unit and display control unit.

AUDIO UNIT COMMUNICATION LINE HARNESS CHECK (1 OF 2)

Terminals				Continuity
Display control unit (+)		Audio unit (-)
Connector	Terminal (Wire color)	Connector	Terminal (Wire color)
M43	40 (R/G)	M46	23 (R/G)	Yes
	42 (R/Y)		21 (R/Y)

Check continuity between display control unit and ground.

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

AUDIO UNIT COMMUNICATION LINE HARNESS CHECK (2 OF 2)

Terminals			Continuity
Display control unit (+)		(-)
Connector	Terminal (Wire color)
M43	40 (R/G)	Ground	No
	42 (R/Y)

OK or NG

OK : GO TO 3.
NG : Repair harness or connector.

CHECK1: AUDIO-TX COMMUNICATION SIGNAL
1. Connect display control unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M43 terminal 40 (R/G) and ground.
  1. Approx. 3.5 V or more
OK or NG
1. OK : GO TO 4.
2. NG : Replace display control unit.
Fig 2: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 40 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK2: AUDIO-RX COMMUNICATION SIGNAL
1. Connect audio unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M43 terminal 42 (R/Y) and ground.
  1. Approx. 3.5 V or more
OK or NG
1. OK : GO TO 5.
2. NG : Replace audio unit.
Fig 3: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 42 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK3: AUDIO-TX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M43 terminal 40 (R/G) and ground with CONSULT-II or oscilloscope.
  1. 40 (R/G) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
OK or NG
1. OK : GO TO 6.
2. NG : Replace audio unit.
Fig 4: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 40 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK4: AUDIO-RX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M43 terminal 42 (R/Y) and ground with CONSULT-II or oscilloscope.
  1. 42 (R/Y) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
OK or NG
1. OK : Replace audio unit.
2. NG : Replace display control unit.
Fig 5: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 42 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Audio Communication Line Check (Between Display Control Unit and Audio Unit)

Use the Manual With the Right Hardware

When to See a Mechanic

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