Door Key Cylinder Switch Check

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Check Door Key Cylinder Switch Input Signal
Check voltage between driver door control unit (LCU01) connector and ground.

Fig 1: Checking Door Key Cylinder Switch Input Signal
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Terminals Connector Voltage Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Further inspection is necessary. Refer to symptom chart.
2. NG: Go to 2.
Check Door Key Cylinder Switch Circuit
1. Turn ignition switch OFF.
2. Disconnect driver door control unit (LCU01) and front door key cylinder switch connector.
3. Check continuity between driver door control unit (LCU01) connector D8 terminal 9, 10 and front door key cylinder switch connector D12 terminals 1, 3.
  
  Fig 3: Checking Door Key Cylinder Switch Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. 9 (PU/W) - 1 (PU/W): Continuity should exist.
  2. 10 (GY) - 3 (GY): Continuity should exist.
OK or NG
1. OK: Go to 3.
2. NG: Repair or replace harness between driver door control unit (LCU01) and front door key cylinder switch.
Check Door Key Cylinder Switch Ground
Check continuity between front door key cylinder switch connector D12 terminal 2 and ground.

Fig 4: Checking Door Key Cylinder Switch Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
1. 2 (B) - Ground: Continuity should exist.
OK or NG
1. OK: Go to 4.
2. NG: Repair or replace harness.
Check Door Key Cylinder Switch
Check continuity between front door key cylinder switch terminal 1, 3 and 2.

Fig 5: Terminals Continuity Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 6: Checking Door Key Cylinder Switch
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Check the condition of the harness and the connector.
2. NG: Replace door key cylinder switch.