Sentra 2.5L

If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.

Turn ignition on. Using CONSULT-II in DATA MONITOR mode, observe LOAD SIGNAL parameter under following conditions. See CHECKING LIGHTING SWITCH LOAD SIGNAL (SENTRA 2.5L) table. If LOAD SIGNAL parameter displays as specified, go to next step. If parameter is not as specified, go to step 9.

CHECKING LIGHTING SWITCH LOAD SIGNAL (SENTRA 2.5L)

Condition	Load Signal
Lighting Switch ON In Second Position	ON
Lighting Switch OFF	OFF

Turn ignition on. Backprobing at ECM, measure voltage between ground and ECM terminal No. 53 (Red/White wire). See Figure and Figure . With lighting switch on, in second position, battery voltage should exist. With lighting switch off, zero volts should exist. If voltage is as specified, go to step 9. If voltage is not as specified, go to next step.
Start engine. Turn headlight switch to second position. If headlights are illuminated, go to next step. If headlights are not illuminated, repair headlight system.
Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location, see Figure. Disconnect lighting switch harness connectors (headlight switch). Connect positive DVOM lead to ECM harness connector terminal No. 53 and negative DVOM lead to lighting switch harness connector terminal No. 9 (Red/White wire at ECM changes to Red/Blue wire at lighting switch), and check for continuity. Move negative DVOM lead to terminal No. 10 (Red/White wire at ECM changes to Red/Yellow wire at lighting switch). Continuity should exist. Reverse DVOM leads, repeat test checking continuity. Continuity should not exist. See Fig 1. Also, check circuits for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step 9.
Check the following:
- Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E108 and M19. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
- Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M58 and F26.
- Check for poor, loose, corroded or damaged terminal connections in diode M55.
- Check for open or short in circuits between ECM and lighting switch.
If problem is found, repair as necessary. After repair, retest system.
Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location, see Figure. Disconnect lighting switch harness connectors (headlight switch). Connect positive DVOM lead to ECM harness connector terminal No. 53 and negative DVOM lead to lighting switch harness connector terminal No. 10 (Red/White wire at ECM changes to Red/Yellow wire at lighting switch), and check for continuity. See Figure and Figure . Reverse DVOM leads and repeat test checking continuity. Continuity should not exist. Also, check circuits for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step 9.
Check the following:
- Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E108 and M19. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
- Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M58 and F26.
- Check for poor, loose, corroded or damaged terminal connections in diode M55.
- Check for open or short in circuits between ECM and lighting switch.
If problem is found, repair as necessary. After repair, retest system.
No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

Fig 1: Checking Lighting System Continuity (Sentra)

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