Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CHECK STOP LAMP SWITCH CIRCUIT

Turn ignition switch OFF.
Check the stop lamp when depressing and releasing the brake pedal.

Brake pedal	Stop lamp
Fully released	Not illuminated
Slightly depressed	Illuminated

OK or NG

OK: GO TO 4.

NG: GO TO 2.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Disconnect stop lamp switch harness connector.
  
  Fig 1: Identifying ASCD Brake And Stop Lamp Switches With Brake Pedal
  Courtesy of NISSAN NORTH AMERICA, INC.
2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT or tester.
Voltage: Battery voltage

OK or NG

OK: GO TO 4.

NG: GO TO 3.

Fig 2: Checking Voltage Between Stop Lamp Switch Harness Connector And Ground Using Tester
Courtesy of NISSAN NORTH AMERICA, INC.
DETECT MALFUNCTIONING PART
Check the following.
- 10A fuse
- Fuse block (J/B) connector E160
- Harness for open and short between stop lamp switch and battery
Repair open circuit or short to ground or short to power in harness or connectors.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist .
4. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 5.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

Fig 3: Identifying ASCD Brake And Stop Lamp Switches With Brake Pedal
Courtesy of NISSAN NORTH AMERICA, INC.
CHECK STOP LAMP SWITCH
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 6.

NG: Replace stop lamp switch. Refer to "REMOVAL AND INSTALLATION ".
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

INSPECTION END