Nissan Sentra Service Manual: Headlamp (lo) circuit
Description
The ipdm e/r (intelligent power distribution module engine room) controls the headlamp low relay based on inputs from the bcm over the can communication lines. When the headlamp low relay is energized, power flows through fuses 43 and 44, located in the ipdm e/r. Power then flows to the front combination lamps to the headlamp low beam.
Component function check
1.Check headlamp (lo) operation
Without consult
- Start ipdm e/r auto active test. Refer to exl-24, "diagnosis description" (with intelligent key system) or exl-28, "diagnosis description" (without intelligent key system).
- Check that the headlamp is turned on.
Note:
HI/LO is repeated 1 second each when using the IPDM E/R auto active test.
Consult
- Select external lamp of ipdm e/r active test item.
- While operating the test items, check that the headlamp is turned on.
Lo : headlamp on
Off : headlamp off
Is the inspection result normal? YES >> Headlamp (LO) is normal.
NO >> Refer to EXL-90, "Diagnosis Procedure".
Diagnosis procedure
Regarding Wiring Diagram information, refer to EXL-33, "Wiring Diagram".
1.Check headlamp (lo) fuses
- Turn the ignition switch off.
- Check that the following fuses are not blown.
Is the fuse blown? YES >> Replace the fuse after repairing the affected circuit.
NO >> GO TO 2.
2.Check headlamp (lo) output voltage
Consult
- Turn the ignition switch off.
- Disconnect the front combination lamp harness connector in question.
- Turn the ignition switch on.
- Select external lamp of ipdm e/r active test item.
- With external lamp on, check the voltage between the combination lamp connector and ground.
Is the inspection result normal? YES >> GO TO 4.
NO >> GO TO 3.
3.Check headlamp (lo) circuit for open
- Turn the ignition switch OFF.
- Disconnect ipdm e/r connector.
- Check continuity between the IPDM E/R harness connector and the front combination lamp harness connector.
Is the inspection result normal? Yes >> replace ipdm e/r. Refer to pcs-30, "removal and installation" (with intelligent key system) or pcs-58, "removal and installation" (without intelligent key system).
No >> repair or replace the harness or connector.
Is the inspection result normal? Yes >> replace ipdm e/r. Refer to pcs-30, "removal and installation" (with intelligent key system) or pcs-58, "removal and installation" (without intelligent key system).
No >> repair or replace the harness or connector.
4.Check front combination lamp (lo) ground circuit
Is the inspection result normal? Yes >> inspect the headlamp bulb.
No >> repair or replace the harness or connector.
Headlamp (hi) circuit
Description
The IPDM E/R (intelligent power distribution module engine room) controls the
headlamp high relay based on
inputs from the BCM over the CAN communication lines. When the headlamp high ...
Daytime light relay circuit
Description
The bcm sends a daytime light request to the ipdm e/r via the can
communication lines. The power flows
through fuse 29 located in fuse block j/b to the daytime light relay coil. When
...
Other materials:
Can communication circuit
Diagnosis procedure
1.Connector inspection
Turn the ignition switch OFF.
Disconnect the battery cable from the negative terminal.
Disconnect all the unit connectors on can communication system.
Check terminals and connectors for damage, bend and loose connection.
Is the inspection resu ...
Dtc/circuit diagnosis
Eco mode switch
Component function check
1. Check eco mode switch operation
Turn ignition switch on.
Check ECO mode indicator lamp turns ON/OFF on combination meter when
turn ECO mode switch ON/
OFF.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Proceed to DM ...
Positive crankcase ventilation
Inspection
1.CHECK PCV VALVE
With engine running at idle, remove PCV valve from rocker cover. A
properly working valve makes a hissing noise as air passes through
it. A strong vacuum should be felt immediately when a finger is
placed over valve inlet.
Is the inspection result normal?
YES &g ...
