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DIAGNOSIS AND REPAIR WORKFLOWEXL-5
< BASIC INSPECTION >
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DETAILED FLOW
1.INTERVIEW FOR MALFUNCTION
Find out what the customer's concerns are.
>> GO TO 2.
2.SYMPTOM CHECK
Verify the symptom from the customer's information.
>> GO TO 3.
3.BASIC INSPECTION
Check the operation of each part. Check that any concerns occur other than those mentioned in the customer
interview.
>> GO TO 4.
4.SELF-DIAGNOSIS WITH CONSULT-III
Perform the self diagnosis with CONSULT- III. Check that any DTC is detected.
Is any DTC detected?
YES >> GO TO 5.
NO >> GO TO 6.
5.TROUBLE DIAGNOSIS BY DTC
Perform the trouble diagnosis for the detect ed DTC. Specify the malfunctioning part.
>> GO TO 9.
6.FAIL-SAFE ACTIVATION CHECK
Determine if the customer's concern is related to fail-safe activation.
Does the fail-safe activate?
YES >> GO TO 7.
NO >> GO TO 8.
7.SYSTEM DIAGNOSIS
Perform the system diagnosis for the system in which t he fail-safe activates. Specify the malfunctioning part.
>> GO TO 9.
8.SYMPTOM DIAGNOSIS
Perform the symptom diagnosis. Specify the malfunctioning part.
>> GO TO 9.
9.MALFUNCTION PART REPAIR
Repair or replace the malfunctioning part.
>> GO TO 10.
10.REPAIR CHECK (SELF-DIAGNOSIS WITH CONSULT-III)
Perform the self diagnosis with CONSUL T-III. Verfied that no DTCs are detected. Erase all DTCs detected
prior to the repair. Verify that DTC is not detected again.
Is any DTC detected?
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EXL-6
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
YES >> GO TO 5.
NO >> GO TO 11.
11 .REPAIR CHECK (OPERATION CHECK)
Check the operation of each part.
Does it operate normally?
YES >> Inspection End.
NO >> GO TO 3.
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HEADLAMPEXL-7
< FUNCTION DIAGNOSIS >
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FUNCTION DIAGNOSIS
HEADLAMP
System DiagramINFOID:0000000005867511
System DescriptionINFOID:0000000005867512
Control of the headlamp system operation is dependent upon t he position of the combination switch (lighting
and turn signal switch). When the combination switch (lighting and turn signal switch) is placed in the 2nd posi-
tion, the BCM (body control module) receives input requesting the headlamps and park lamps to illuminate.
This input is communicated to the IPDM E/R (intelligent power distribution module engine room) via the CAN
communication lines. The CPU (central processing unit) of the IPDM E/R controls the headlamp LH high,
headlamp RH high and headlamp low relay coils. When energiz ed, these relays direct power to the respective
headlamps, which then illuminate.
Component Parts LocationINFOID:0000000005867513
Component DescriptionINFOID:0000000005867514
XENON HEADLAMP
AWLIA1755GB
1. BCM M18, M20 (view with instrument
panel removed) 2. IPDM E/R E122, E123, E124 3. Combination switch (lighting and turn
signal switch) M28
4. Combination meter M23, M24
AWLIA1625ZZ
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EXL-8
< FUNCTION DIAGNOSIS >
HEADLAMP
A Xenon type headlamp is adapted to the low beam headlamps. Xenon bulbs do not use a filament. Instead,
they produce light when a high voltage current is pa ssed between two tungsten electrodes through a mixture
of Xenon (an inert gas) and certain other metal halides. In addition to added lighting power, electronic control
of the power supply gives the headlamps stable quality and tone color. Following are some of the advantages
of the Xenon type headlamp.
• The light produced by the headlamps is a white color comparable to sunlight that is easy on the eyes.
• Light output is nearly double that of halogen headlamps, affording increased area of illumination.
• The light features a high relative spectral distribution at wavelengths to which the human eye is most sensi- tive. This means that even in the rain, more light is reflected back from the road surface toward the vehicle,
for added visibility.
• Power consumption is approximately 25 percent less than halogen headlamps, reducing battery load.
HIGH BEAM OPERATION/FLASH-TO-PASS OPERATION
With the combination switch (lighting and turn signal switch) in the 2ND position and placed in HIGH position,
the BCM receives input 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 is communicated to the IPDM E/R via the CAN
communication lines. The CPU of the combination meter c ontrols the ON/OFF status off the HIGH BEAM indi-
cator. The CPU of the IPDM E/R controls the headlamp LH high and RH high relay coils which supplies power
to the high beam headlamps.
The combination meter receives a high beam request signal (ON) via the CAN communication lines and turns
the high beam indicator lamp ON.
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DAYTIME LIGHT SYSTEMEXL-9
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DAYTIME LIGHT SYSTEM
System DiagramINFOID:0000000003776148
System DescriptionINFOID:0000000003776149
The headlamp system for Canada vehicles is equipped with a daytime light control unit that activates the high
beam headlamps at approximately half illumination whenever the engine is operating. If the parking brake is
applied before the engine is started the daytime lights will not be illuminated. The daytime lights will illuminate
once the parking brake is released. Thereafter, the daytime lights will continue to operate when the parking
brake is applied.
Component Parts LocationINFOID:0000000003776150
AWLIA1596GB
AWLIA1626ZZ
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EXL-10
< FUNCTION DIAGNOSIS >
DAYTIME LIGHT SYSTEM
Component Description
INFOID:0000000003776151
After starting the engine with the parking brake released and the lighting switch in the OFF or 1ST position, the
headlamp high beam automatically turns on at a reduced intensity. With the lighting switch in the 2nd position
or with autolamps ON, the headlamps function the same as conventional light systems.
OPERATION
The BCM monitors inputs from the parking brake switch and the combination switch to determine when to acti-
vate the daytime light system. The BCM sends a dayti me light request to the IPDM E/R via the CAN commu-
nication lines. The IPDM E/R grounds the daytime light relay which in turn, provides power to the ground side
of the LH high beam lamp. Power flows backward through the LH high beam lamp to the IPDM E/R, through
the high beam fuses, through the RH high beam lamp circuit to the RH high beam lamp and on to ground. The
high beam lamps are wired in series which causes them to illuminate at a reduced intensity.
1. IPDM E/R E119, E122, E123, E124 2. BCM M18, M20 (view with instrument
panel removed)3. Daytime running light relay E103
4. Combination switch M28 5. Combination meter M23, M24 6. Parking brake switch M11
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AUTO LIGHT SYSTEMEXL-11
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AUTO LIGHT SYSTEM
System DiagramINFOID:0000000005867516
System DescriptionINFOID:0000000003776153
• BCM (Body Control Module) controls auto light operati on according to signals from optical sensor, lighting
switch and ignition switch.
• IPDM E/R (Intelligent Power Distribution Module Engine Room) operates parking, license plate, tail and
headlamps according to CAN communication signals from BCM.
• Optical sensor detects ambient br ightness and converts light (lux) to voltage, then sends the optical sensor
signal to BCM.
OUTLINE
The auto light control system has an optical sensor that detects outside brightness.
When the lighting switch is in AUTO position, it automat ically turns ON/OFF the parking, license plate, tail and
headlamps in accordance with the ambient light. Sensitivity can be adjusted in four steps. For the details of the
setting, Refer to EXL-22, "
HEADLAMP : CONSULT-III F unction (BCM - HEAD LAMP)".
AWLIA1752GB
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EXL-12
< FUNCTION DIAGNOSIS >
AUTO LIGHT SYSTEM
Component Parts Location
INFOID:0000000003776154
Component DescriptionINFOID:0000000003776155
AUTO LIGHT OPERATION
The auto light system operates t he low beam and high beam headlamps, parking lamps, tail lamps and license
plate lamps. The BCM monitors the lighting switch (com bination switch) position as a part of the BCM combi-
nation switch reading function. When the lighting switch is in the AUTO position, the BCM automatically turns
the lamps ON/OFF according to ambient light brightness.
NOTE:
Timing for when lamps turn ON/OFF can be changed by the function setting of CONSULT-III. Refer to EXL-22,
"HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)".
1. BCM M18, M19, M20 (view with instru-
ment panel removed) 2. IPDM E/R E122, E123, E124 3. Optical sensor M302
4. Front door switch LH B8
RH B108 5. Rear door switch
LH B18
RH B116 6. Back door latch (door ajar switch)
D503
7. Combination switch M28
AWLIA1627ZZ
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