NISSAN LATIO 2009 Service Repair Manual

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• to BCM terminal 67
• to combination meter terminals 21, 22 and 23
• through grounds M57 and M61, and
• to IPDM E/R terminals 39 and 59
• through grounds E15 and E24.
HEADLAMP OPERATION
Low Beam Operation With the lighting switch in 2ND position, the BCM re ceives an input signal requesting the headlamps to illumi-
nate. The BCM then sends a signal, via the CAN comm unication lines, to the IPDM E/R requesting the low
beam headlamps be turned ON. The CPU located in the IPDM E/R controls ground to the headlamp low relay
coil, which when energized, directs power
• through 15A fuse (No. 41, located in IPDM E/R)
• through IPDM E/R terminal 54
• to headlamp RH terminal 3, and
• through 15A fuse (No. 40, located in IPDM E/R)
• through IPDM E/R terminal 52
• to headlamp LH terminal 3.
Ground is supplied
• to headlamp RH and LH terminals 2
• through grounds E15 and E24.
With power and ground supplied, low beam headlamps illuminate.
High Beam Operation/Flash-to-Pass Operation With the lighting switch in 2ND position and high beam s witch in the HIGH position, the BCM receives an input
signal requesting the headlamp high beams to illuminate. The flash to pass feature can be used any time and
also sends a signal to the BCM. This input signal is then communicated to the IPDM E/R and the combination
meter via the CAN communication. The CPU located in the IPDM E/R controls the headlamp high relays (LH
and RH), which when energized, directs power
• through 10A fuse (No. 34, located in IPDM E/R)
• through IPDM E/R terminal 56
• to headlamp RH terminal 1, and
• through 10A fuse (No. 35, located in IPDM E/R)
• through IPDM E/R terminal 55
• to headlamp LH terminal 1.
Ground is supplied
• to headlamp RH and LH terminal 2
• through grounds E15 and E24.
With power and ground supplied, the high beam headlamps illuminate.
The BCM sends a signal, via the CAN communication lines, to the combination meter requesting the high
beam indicator lamp be turned ON.
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:0000000004306522
Refer to LAN-8 .

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Wiring Diagram
INFOID:0000000004306524 B

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Terminal and Reference Value for BCM " .
Terminal and Reference Value for IPDM E/R INFOID:0000000004306526
Refer to PG-24, " Terminal and Reference Value for IPDM E/R " .

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How to Perform Trouble Diagnosis
INFOID:0000000004306527
1. Confirm the symptom or customer complaint.
2. Understand operation, description and function description. Refer to LT-4, " System Description " .
3. Perform the Preliminary Check. Refer to LT-11, " Preliminary Check " .
4. Check symptom and repair or replace the cause of the malfunction.
5. Do the headlamps operate normally? If YES, GO TO 6. If NO, GO TO 4.
6. INSPECTION END
Preliminary Check INFOID:0000000004306528
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:0000000004306529
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
WORK SUPPORT
Display Item List
DATA MONITOR
Display Item List BCM diagnostic
test item Diagnostic mode Description
Inspection by part WORK SUPPORT
Supports inspections and adjustments. Commands are transmitted to the BCM for
setting the status suitable for required operation, input/output signals are received
from the BCM and received data is displayed.
DATA MONITOR Displays BCM input/output data in real time. ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read. ECU PART NUMBER BCM part number can be read.
CONFIGURATION Performs BCM configuration read/write functions. Item Description CONSULT-III Factory setting
BATTERY SAVER SET Exterior lamp battery saver control mode can be changed
in this mode. Selects exterior lamp battery saver control
mode between ON/OFF. ON
×
OFF — Monitor item Contents
IGN ON SW "ON/OFF" Displays "IGN position (ON)/OFF, ACC position (OFF)" judged from the ignition switch signal.
ACC ON SW "ON/OFF" Displays "ACC (ON)/OFF, Ignition OFF (OFF)" status judged from ignition switch signal.
HI BEAM SW "ON/OFF" Displays status (high beam switch: ON/Others: OFF) of high beam switch judged from lighting
switch signal.
HEAD LAMP SW 1 "ON/OFF" Displays status (headlamp switch 1: ON/Others: OFF) of headlamp switch 2 judged from lighting
switch signal.
HEAD LAMP SW 2 "ON/OFF" Displays status (headlamp switch 2: ON/Others: OFF) of headlamp switch 2 judged from lighting
switch signal.

Test item Description
TAIL LAMP Allows tail lamp relay to operate by switching ON-OFF.
HEAD LAMP Allows headlamp relay (HI, LO) to operate by switching ON-OFF.
FR FOG LAMP Allows fog lamp relay to operate by switching ON-OFF. Monitored item CONSULT-llI display Description
CAN communication CAN communication [U1000] Malfunction is detected in CAN communication.
CAN communication system CAN communication system 1 to 6 [U1000] Malfunction is detected in CAN system. IPDM E/R diagnostic Mode Description
SELF-DIAG RESULTS Displays IPDM E/R self-diagnosis results. DATA MONITOR Displays IPDM E/R in put/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read. ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.

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NOTE:
Perform monitoring of IPDM E/R data with the ignition swit ch ON. When the ignition switch is at ACC, the dis-
play may not be correct.
ACTIVE TEST
Headlamp High Beam Does No t Illuminate (Both Sides) INFOID:0000000004306531Combination Switch Inspection " .
OK or NG OK >> GO TO 2.
NG >> Check combination switch (lighting switch). Refer to LT-63, " Combination Switch Inspection " .
Auto Active Test " .
2. Make sure headlamp high beam operates. Item name
CONSULT-III screen
display Display or
unit Monitor item selection
Description
ALL
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
Parking, license plate
and tail lamps request TAIL&CLR REQ ON/OFF
× × ×Signal status input from BCM
Headlamp low beam re-
quest HL LO REQ ON/OFF
× × × Signal status input from BCM
Headlamp high beam re-
quest HL HI REQ ON/OFF
× × × Signal status input from BCM
Front fog lamps request FR FOG REQ ON/OFF × × ×Signal status input from BCM
Daytime light request DTRL REQ ON/OFF x x x Signal status input from BCM Test item CONSULT-III screen display Description
Tail lamp relay output TAIL LAMP Allows tail lamp relay to operate by switching operation ON-OFF at your
option.
Headlamp relay (HI, LO) out-
put LAMPSAllows headlamp relay (HI, LO) to operate by switching operation (OFF,
HI, LO) at your option (Head lamp high beam repeats ON-OFF every 1
second).
Front fog lamp relay (FOG)
output Allows fog lamp relay (FOG) to operate by switching operation ON-OFF
at your option. Headlamp high beam should operate
(Headlamp high beam repeats ON–OFF every 2 sec-
onds).

OK >> GO TO 3.
NG >> GO TO 4. OK >> Replace IPDM E/R. Refer to
PG-27, " Removal and Installation of IPDM E/R " .
NG >> Replace BCM. Refer to BCS-18, " Removal and Installation of BCM " .
OK >> GO TO 5.
NG >> Repair harness. OK >> GO TO 6.
NG >> Replace headlamp bulb. LT-22, " Bulb Replacement " .
Auto Active Test " .
4. When headlamp high beam is operating, check voltage between headlamp harness connector and ground.Headlamp high beam should operate.
When lighting switch is high
position : HL HI REQ ON
Terminal Voltage
(+)
(− )
Headlamp connector Terminal
RH E26 1 Ground Battery voltage
LH E25
Terminal Voltage
(+)
(− )
Headlamp connector Terminal