Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten four ground screws on the body.
  Refer to GROUND INSPECTION .
  
  Fig 1: Checking Ground Connections
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 2.
- NG: Repair or replace ground connections.
CHECK ASCD STEERING SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch ON.
2. Select "MAIN SW", "RESUME/ACC SW", "SET SW" and "CANCEL SW" in "DATA MONITOR" mode with CONSULT-II.
3. Check each item indication under the following conditions.
  
  Fig 2: ASCD Steering Switch Circuit Indication Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: CONSULT-II Data Monitor Screen
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 99 and ground with pressing each button.
  
  Fig 4: ECM Terminal & Ground Voltage Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Checking Voltage Between ECM Terminal 99 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 8.
- NG: GO TO 3.
CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect combination switch harness connector M102.
3. Disconnect ECM harness connector.
4. Check harness continuity between combination switch terminal 15 and ECM terminal 67.
  Refer to WIRING DIAGRAM - ASC/SW .
  
  Continuity should exist.
5. Also check harness for short to ground or short to power.
OK or NG
- OK: GO TO 5.
- NG: GO TO 4.
  
  Fig 6: Identifying ASCD Steering Switches
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M71, F59
- Combination switch (spiral cable)
- Harness for open and short between ECM and combination switch
  : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 99 and combination switch terminal 14.
  Refer to WIRING DIAGRAM - ASC/SW .
  
  Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
- OK: GO TO 7.
- NG: GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Combination switch (spiral cable)
- Harness for open and short between ECM and combination switch
- Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ASCD STEERING SWITCH
Refer to COMPONENT INSPECTION .

OK or NG
- OK: GO TO 8.
- NG: Replace ASCD steering switch. Refer to Removal and Installation of Steering Wheel Audio Control Switches .
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
- INSPECTION END