Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

Is a malfunction in the CAN communication indicated in the results?
1. YES: Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE ".
2. NO: GO TO 2.
CHECK STOP LAMP SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch "ON". (Do not start engine.)
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Read out ON/OFF switching action of the "BRAKE SW".
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 3.
Fig 1: Consult II DATA MONITOR Screen
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK STOP LAMP SWITCH

Check continuity between stop lamp switch harness connector terminals 1 and 2.

Fig 2: Checking Continuity Between Stop Lamp Switch Harness Connector Terminals 1 & 2

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

STOP LAMP SWITCH CONTINUITY TABLE

Condition	Continuity
When brake pedal is depressed	Yes
When brake pedal is released	No

Check stop lamp switch after adjusting brake pedal - Refer to "BRAKE PEDAL ".

OK or NG

OK: INSPECTION END
NG: Check the following items. If NG, repair or replace damaged parts.
- Harness for short or open between battery and stop lamp switch.
- Harness for short or open between stop lamp switch and combination meter.