Key Switch And Ignition Knob Switch Circuit Inspection

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK KEY SWITCH AND IGNITION KNOB SWITCH

With CONSULT-III

With "KEY SW" on the DATA MONITOR, Check ON/OFF operation.

KEY SW MONITOR ITEM CHART

Monitor item [OPERATION or UNIT]	Condition
KEY SW	Insert mechanical key into ignition switch: ON
KEY SW	Remove mechanical key from ignition switch: OFF

Without CONSULT-III

GO TO 2.

OK or NG

OK: Key switch and ignition knob switch circuit is OK.

NG: GO TO 2.

KEY SWITCH AND IGNITION KNOB SWITCH POWER SUPPLY CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. Disconnect key switch and ignition knob switch.
3. Check voltage between key switch and ignition knob switch connector M73 terminal 3 and ground.
  3 - Ground: Battery voltage.
Fig 1: Checking Voltage Between Key Switch And Ignition Knob Switch Connector M73 Terminal 3 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 3.

NG: Check harness between key switch and ignition knob switch and fuse.

CHECK KEY SWITCH AND IGNITION KNOB SWITCH

Check continuity between key switch and ignition knob switch terminals as follows.

KEY SWITCH AND IGNITION KNOB SWITCH

Terminals		Condition	Continuity
3	4	Key is inserted in ignition key cylinder.	Yes
3	4	Key is removed from ignition key cylinder.	No

Fig 2: Checking Continuity Between Key Switch And Ignition Knob Switch Terminals

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

OK or NG

OK: GO TO 4.

NG: Replace key switch and ignition knob switch.

CHECK HARNESS CONTINUITY 1
1. Disconnect key switch and ignition knob switch and intelligent key control unit.
2. Check continuity between key switch and ignition knob switch connector M73 (A) terminal 4 and intelligent key control unit connector M52 terminal 7.
  4 - 7: Continuity should exist.
3. Check continuity between key switch and key lock solenoid connector M27 terminal 4 and ground.
  4 - Ground: Continuity should not exist.
Fig 3: Checking Continuity Between Terminal 4 And Terminal 7
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: Check the condition of harness and harness connector.

NG: Repair or replace harness.