NISSAN LATIO 2009 Service Repair Manual

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HEADLAMP (FOR CANADA)
- DAYTIME LIGHT SYSTEM -
Component Parts and Har ness Connector Location INFOID:0000000004306541
System Description INFOID:0000000004306542
Headlamp operation is controlled by the BCM (body c ontrol module) based on inputs from the combination
switch (lighting switch). When the lighting switch is pl aced in the 2ND position, the BCM receives an input sig-
nal requesting the headlamps (and tail lamps) illuminate. The request is then communicated to the IPDM E/R
(intelligent power distribution module engine room) vi a the CAN communication lines. The CPU (central pro-
cessing unit) located in the IPDM E/R controls ground for the headlamp high and headlamp low relay coils.
These relays direct power to the respective headlamps , which then illuminate. When the headlamp switch is
OFF or in the 1ST position (parking lamps ON), the parking brake is released and the engine is running, the
IPDM E/R de-energizes the headlamp relays and supplies gr ound to the daytime light relay 1 to actuate the
daytime light function.
OUTLINE Power is supplied at all times
• to headlamp high relay RH and LH (located in IPDM E/R)
• to headlamp low relay (located in IPDM E/R) and
• to ignition relay (located in IPDM E/R)
• through 15A fuse (No. 52, located in IPDM E/R) and
• through 20A fuse (No. 53, located in IPDM E/R)
• to CPU located in IPDM E/R,
• through 40A fusible link (letter g , located in fuse and fusible link box)
• to BCM terminal 70,
• through 10A fuse [No. 8, located in fuse block (J/B)]
• to BCM terminal 57,
• through 10A fuse [No. 13, located in fuse block (J/B)]
• to combination meter terminal 27,
• through 10A fuse (No. 26, located in fuse and fusible link box)
• to the daytime light relay 1.
With the ignition switch in the ON or START position, power is supplied
• to the ignition relay (located in IPDM E/R),
• through 10A fuse [No. 6, located in fuse block (J/B)]
• to BCM terminal 38, 1. IPDM E/R E43, E46, E47 and E48 2. BCM M18 and M20 (view with glove
box removed)3. Combination switch (lighting switch)
M28
4. Combination meter M24 5. Daytime light relay 1 E37 and day- time light relay 2 E386. Parking brake switch M17

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• to IPDM E/R terminal 56,
• through 10A fuse (No. 34, located in IPDM E/R) and
• through both de-energized headlamp high relays
• to 10A fuse (No. 35, located in IPDM E/R),
• through IPDM E/R terminal 55
• to front combination lamp LH terminal high beam 1.
Ground is supplied
• to front combination lamp LH terminal 2
• through grounds E15 and E24,
• to daytime light relay 1 terminal 1
• through IPDM E/R terminal 6.
With power and ground supplied, high beam headlamps illuminate at reduced intensity.
COMBINATION SWITCH READING FUNCTION Refer to BCS-3, " System Description " .
EXTERIOR LAMP BATTERY SAVER CONTROL Refer to LT-73, " System Description " .
CAN Communication System Description INFOID:0000000004306543
Refer to LAN-8, " System Description " .

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Wiring Diagram - DTRL -
INFOID:0000000004306545 B

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Terminal and Reference Value for BCM "
Terminal and Reference Value for IPDM E/R " .

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How to Perform Trouble Diagnosis
INFOID:0000000004306548
1. Confirm the symptom or customer complaint.
2. Understand operation, description and function description. Refer to LT-25, " System Description " .
3. Perform the Preliminary Check. Refer to LT-33, " Preliminary Check " .
4. Check symptom and repair or replace the cause of the malfunction.
5. Does the daytime light system operate norma lly? If YES, GO TO 6. If NO, GO TO 4.
6. INSPECTION END
Preliminary Check INFOID:0000000004306549
CHECK BCM CONFIGURATION Configuration " .
OK or NG OK >> Continue preliminary check. Refer to
BCS-15, " BCM Power Supply and Ground Circuit Inspec-
tion " .
NG >> Change BCM configuration for "DTRL" to "WITH". Refer to BCS-18, " Configuration " .
CHECK POWER SUPPLY AND GROUND CIRCUIT FOR BCM Refer to BCS-15, " BCM Power Supply and Ground Circuit Inspection " .
CHECK POWER SUPPLY AND GROUND CIRCUIT FOR IPDM E/R Refer to PG-26, " IPDM E/R Power/Ground Circuit Inspection " .
CONSULT-III Function (BCM) INFOID:0000000004306550
Refer to LT-11, " CONSULT-III Function (BCM) " .
CONSULT-III Function (IPDM E/R) INFOID:0000000004306551
Refer to LT-12, " CONSULT-III Function (IPDM E/R) " .
Daytime Light Control Does Not Operate Properly (High Beam Headlamps Operate
Properly) INFOID:0000000004306552OK >> GO TO 2.
NG >> Repair harness. OK >> GO TO 3.
NG >> Repair harness or connector.

OK >> GO TO 4.
NG >> Replace daytime light relay 1. OK >> GO TO 6.
NG >> GO TO 5. NO DTC>>Replace BCM. Refer to
BCS-18, " Removal and Installation of BCM " .
CAN COMM CIRCUIT>> Check BCM CAN communication system. Refer to LAN-17, " Trouble Diagnosis
Flow Chart " .
OK >> Replace the IPDM E/R. Refer to
PG-27, " Removal and
Installation of IPDM E/R " .
NG >> Repair harness or connector. 3 - 5 : Continuity should exist.