Power Supply and Ground Circuit Check for Display Unit

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 POWER SUPPLY AND GROUND CIRCUIT FOR DISPLAY CONTROL UNIT
1. Check power supply and ground circuit for display control unit. Refer to "POWER SUPPLY AND GROUND CIRCUIT CHECK FOR DISPLAY CONTROL UNIT ".
OK or NG

OK: GO TO 2.

NG: Repair malfunctioning part.
CHECK POWER SUPPLY CIRCUIT FOR DISPLAY UNIT
1. Disconnect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display unit harness connector M93 terminals 2, 3 and ground.
  Approx. 9V
OK or NG

OK: GO TO 4.

NG: GO TO 3.

Fig 1: Checking Voltage Between Display Unit Connector M93 Terminals 2, 3 And Ground

CHECK HARNESS

Turn ignition switch OFF.
Disconnect display control unit connector M94.

Check continuity between display control unit harness connector M94 terminals 2, 4 and display unit harness connector M93 terminals 2, 3.

TERMINALS CONTINUITY CHART

Terminals				Continuity
Display control unit		Display unit
Connector	Terminal	Connector	Terminal
M94	2	M93	2	Yes
M94	4	M93	3	Yes

Check continuity between display unit and ground.

TERMINALS CONTINUITY CHART

Terminals			Continuity
Display unit		-
Connector	Terminal	-
M93	2	Ground	No
M93	3	Ground	No

Fig 2: Checking Continuity Between Display Control Unit Connector M94 Terminals 2, 4 And Display Unit Connector M93 Terminals 2, 3

OK or NG

OK: Replace display control unit. Refer to "DISPLAY CONTROL UNIT ".

NG: Repair harness.

CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between display unit harness connector M93 terminals 13, 14 and ground.
  Continuity should exist.
OK or NG

OK: GO TO 6.

NG: GO TO 5.

Fig 3: Checking Continuity Between Display Unit Connector M93 Terminals 13, 14 And Ground
CHECK HARNESS
1. Disconnect display control unit connector M94.
2. Check continuity between display unit harness connector M93 terminals 13, 14 and display control unit harness connector M94 terminals 5, 7.
  Continuity should exist.
OK or NG

OK: Replace display control unit. Refer to "DISPLAY CONTROL UNIT ".

NG: Repair harness.

Fig 4: Checking Continuity Between Connector Terminals 13, 14 And Connector Terminals 5, 7

CHECK GROUND CIRCUIT

Check continuity between display unit and ground as follows.

TERMINALS CONTINUITY CHART

Terminals			Ignition switch	Continuity
Connector	Terminal	-	Ignition switch	Continuity
M93	1	Ground	OFF	Yes

OK or NG

OK: Inspection End.

NG: Repair harness.

Fig 5: Checking Continuity Between Display Unit And Ground