ASCD Brake/Stop Lamp Switch Check

CHECK ASCD BRAKE SWITCH CIRCUIT
With CONSULT-II

See "BRAKE SW" in "DATA MONITOR" mode.
1. When brake pedal is depressed or A/T
2. selector lever is in "N" or "P" range: BRAKE SW OFF
3. When brake pedal is released or A/T
4. selector lever is in "N" or "P" range: BRAKE SW ON
Fig 1: Identifying Data Monitor
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II
1. Disconnect ASCD control unit harness connector.
2. Turn ignition switch ON.
3. Check voltage between ASCD control unit harness connector terminal 8 and ground.
  1. When brake pedal is depressed or A/T Approx. 0 V
  2. selector lever is in "N" or "P" range:
  3. When brake pedal is released or A/T Battery voltage
  4. selector lever is in "N" or "P" range: should exist.
  Fig 2: Checking Voltage Between ASCD Connector Terminal 8 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK >> GO TO 2.
2. NG >> Check the following.
  - ASCD brake switch
    Refer to "ELECTRICAL COMPONENT INSPECTION ".
  - Park/neutral position switch
    Refer to "ELECTRICAL COMPONENT INSPECTION ".
  - Park/neutral position relay
  - Harness for open or short
CHECK STOP LAMP SWITCH CIRCUIT
With CONSULT-II

See "STOP LAMP" in "DATA MONITOR" mode.
1. When brake pedal is released: STOP LAMP SW OFF
2. When brake pedal is depressed: STOP LAMP SW ON
  
  Fig 3: Identifying Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
1. Disconnect ASCD control unit harness connector.
2. Check voltage between ASCD control unit harness connector terminal 23 and ground.
  1. When brake pedal is released: Approx. 12 V
  2. When brake pedal is depressed: 0 V
  Fig 4: Checking Voltage Between ASCD Connector Terminal 23 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
Refer to wiring diagram in "FIG. 3 ".

OK or NG
1. OK >> ASCD brake/stop lamp switch is OK.
2. NG >> Check the following.
  - 15A fuse [No. 17, located in the fuse block (J/B)]
  - Harness for open or short between ASCD control unit and stop lamp switch
  - Harness for open or short between fuse and stop lamp switch
  - Stop lamp switch
    Refer to "ELECTRICAL COMPONENT INSPECTION ".