Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK STOP LAMP SWITCH CIRCUIT

Check and adjust the installation position of stop lamp switch. Refer to "INSPECTION AND ADJUSTMENT ".
Disconnect BCM connector.
Check voltage between BCM vehicle side harness connector terminal and ground.

TERMINAL VOLTAGE REFERENCE

BCM vehicle side harness connector		Ground	Condition	Voltage (Approx.)
Connector	Terminal
M18	26		Depressed brake pedal	Battery voltage
			Released brake pedal	0V

Is the inspection result normal?

YES: GO TO 5.

NO: GO TO 2.

Fig 1: Checking Voltage Between BCM Vehicle Side Harness Connector Terminal 26 And Ground

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

CHECK HARNESS BETWEEN STOP LAMP SWITCH AND BCM (PART 1)

Disconnect stop lamp switch connector.
Check continuity between stop lamp switch vehicle side harness connector terminal and BCM vehicle side harness connector terminal.

TERMINAL CONTINUITY REFERENCE

Stop lamp switch vehicle side harness connector		BCM vehicle side harness connector		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E38 (A)	4	M18 (B)	26	Existed

Is the inspection result normal?

YES: GO TO 3.

NO: Repair or replace damaged parts.

Fig 2: Checking Continuity Between Stop Lamp Switch And BCM Vehicle Side Harness Connector Terminals

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

CHECK HARNESS BETWEEN STOP LAMP SWITCH AND BCM (PART 2)

Check continuity between BCM vehicle side harness connector terminal and ground.

TERMINAL CONTINUITY REFERENCE

BCM vehicle side harness connector		Ground	Continuity
Connector	Terminal
M18	26		Not existed

Is the inspection result normal?

YES: GO TO 4.

NO: Repair or replace damaged parts.

Fig 3: Checking Continuity Between BCM Vehicle Side Harness Connector Terminal 26 And Ground

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

CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to "COMPONENT INSPECTION (STOP LAMP SWITCH) ".

Is the inspection result normal?

YES: Check the following.
- Harness for short or open between battery and stop lamp switch
- 10A fuse [No. 7, located in fuse block (J/B)]
NO: Repair or replace stop lamp switch.
CHECK BCM
With CONSULT-III
1. Turn ignition switch OFF.
2. Connect BCM connector.
3. Turn ignition switch ON.
4. Select "BRAKE SW 1" in "Data Monitor" in "BCM" and verify the proper operation of ON/OFF. Refer to "REFERENCE VALUE ".
Is the inspection result normal?

YES: GO TO 6.

NO: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".
DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.

Is the inspection result normal?

YES: Replace TCM. Refer to "EXPLODED VIEW ".

NO: Repair or replace damaged parts.