3. Check ASCD Brake Switch Power Supply Circuit

1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
   Fig 1: Locating ASCD Brake Switch

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
   1. Voltage: Battery voltage 

OK or NG 

OK >>GO TO 5. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT .

NG >>GO TO 4. DETECT MALFUNCTIONING PART .

Fig 2: Check Voltage Between ASCD Brake Switch Terminal 1 And Ground

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