Subaru BRZ 2013 · Service Manual Exterior body & electrical

Lighting system

Precautions Parts location System information Troubleshooting Diagnostic trouble codes Circuit diagnosis Removal / installation

LIGHTING (EXTERIOR)
LIGHTING SYSTEM
PRECAUTIONS
1. Precautions when handling the discharge headlights
(1) When the light control switch is set to HEAD, touching the high voltage sockets of the discharge headlights instantly produces a high voltage of approximately 22,000 V, and can cause serious accidents.
(2) Measuring with putting a tester on the high voltage sockets of the discharge headlights can cause serious accidents due to high voltage. Never perform such measurements.
(3) When the light control switch is set to HEAD, or just after switching to OFF, the headlight light control computer ASSY may be hot, so be careful not to burn yourself.
(4) When doing work related to the discharge headlights, perform work under the following conditions.
(a) Perform in a place where there is no water or rain. (To prevent electrocution)
(b) Turn the light control switch OFF.
(c) The temperature of the headlight light control computer ASSY must have sufficiently decreased.
(d) Remove the battery terminals and disconnect the connectors clamped to the headlight ASSY. (Cut off the power supply to the headlight light control computer ASSY)
(5) When doing work related to the discharge headlights, if you are lighting up the bulbs, do so after they are completely assembled. Never turn the lights on if they are not equipped.
(6) Do not use a power source other than the vehicle to light up the discharge headlights.
(7) If a discharge headlight (and in particular, the headlight light control computer ASSY) is damaged in the following ways, replace it with a new one.
(a) If there is any evident disfiguration on the computer (warp, twisting, depression, dent, crack, splinter).
(b) If there is any crack or splinter in the plastic parts of the high voltage socket or the connector, or any disfiguration in the terminal part.
(c) If there is any instability in the connection with the grounding of the reflector due to a disfiguration of the socket cover.
(d) If there is any scratch on the high voltage harnesses or power wiring harnesses.
NOTE:
Even if they temporarily operate properly, when there is a failure, the fail-safe function will work and turn the lights off.
(8) Even if the discharge headlight bulbs light up temporarily, they may turn off again or flicker. Perform a failure diagnosis on the discharge headlight bulbs. (Refer to )
(9) The color of the light emitted by the discharge headlights changes with the length of time in use.
2. Precautions for replacing each light's bulb.
(1) Halogen lights become hot during use. If any grease, etc, is stuck to the bulb surface, it will shorten the service life of the service bulb. When replacing the bulb, grasp it by the flange section, while taking care not to touch the glass section.
(2) Halogen bulbs contain high pressure. If you drop, bump, or damage them, the bulbs may break, scattering the glass.
(3) If you leave a bulb out for a long time after removal, debris or dampness may enter the lens. Therefore, replace the bulb after preparing a new bulb.
(4) Be sure to replace the bulb with one of the same standard and wattage.
(5) Replacing only one bulb may create a difference in the brightness and color of the light emitted from the left and right side.
(6) Improper installation in the socket can cause cloudiness or water to enter to the lens, so after replacing the bulb, securely install it.
(7) Flying glass fragments can cause injuries, so dispose of used discharge headlight bulbs without breaking them.
3. Precautions during headlight beam adjustment
(1) If using a cover when the headlights are on, do not perform for 3 minutes or more.
(2) Because the headlight outer lens is made of plastic, performing the adjustment for a long time will cause heat that may cause disfiguration.
FUNCTION INSPECTION
1. Before troubleshooting
(1) Basic inspection
(a) Inspect the battery voltage.
Standard value :  11 to 14 V (when IG OFF)
(2) Inspect for blown light bulbs and fuses, wiring harnesses open circuit, short circuits, and poor contact of connectors, in places where you can inspect visually.
2. Operation inspection of the DRL system
(1) Start the engine.
(2) Move the shift lever in a position other than P.
(3) Release the parking brake.
(4) Turn the light control switch to OFF position.
(5) Check that the DRL lights turn on.
3. Battery saver inspection
(1) With the ignition key removed from the IG SW, turn the light control switch to TAIL or HEAD, and turn on the headlights.
(2) With the light control switch in the same position for 20 minutes, check that the headlights and tail lights turn off.
PARTS LOCATION
SYMPTOM TABLE
Headlights
Symptoms
 Inspection items
 Reference pages
The headlights (both LO and HI beam) don't turn on.
 MAIN fuse
 -
Headlight dimmer switch circuit
  
Main body ECM (Network gateway computer)
 -
Vehicle wiring harness and connector
 -
The headlights (LO beam) don't turn on.
 H-LP LH-LO fuse, H-LP RH-LO fuse
 -
Headlight No. 1 bulb *1
 -
Discharge headlight bulb *2
  
Headlight dimmer switch circuit
  
Low beam headlight circuit
  
Main body ECM (Network gateway computer)
 -
Vehicle wiring harnesses and connectors (low beam headlight - H-LP relay, chassis ground)
 -
One of the headlights (LO beam) doesn't turn on.
 H-LP LH LO, H-LP RH LO fuse
 -
Headlight No. 1 bulb *1
 -
Discharge headlight bulb *2
  
Headlight light control computer ASSY*2
 -
Headlight ASSY
 -
Vehicle wiring harnesses and connectors (low beam headlight - H-LP relay, chassis ground)
 -
The headlights (HI beam) don't turn on.
 H-LP LH HI, H-LP RH HI fuse
 -
Headlight No. 2 bulb *1
 -
Discharge headlight bulb *2
  
Headlight dimmer switch circuit
  
High beam headlight circuit
  
Vehicle wiring harnesses and connectors (low beam headlight - DIM relay, chassis ground)
 -
Main body ECM (Network gateway computer)
 -
Headlight light control computer ASSY*2
 -
One of the headlights (HI beam) doesn't turn on.
 H-LP LH HI, H-LP RH HI fuse
 -
Headlight No. 2 bulb *1
 -
Discharge headlight bulb *2
  
Headlight light control computer ASSY*2
 -
Headlight ASSY
 -
Vehicle wiring harnesses and connectors (low beam headlight - DIM relay, chassis ground)
 -
Flashing doesn't function.
 Headlight dimmer switch circuit
  
Vehicle wiring harnesses and connectors (low beam headlight - DIM relay, chassis ground)
 -
The headlight (discharge bulb) flickers, is dark. *2
 Headlight light control computer ASSY*2
 -
Discharge headlight bulb *2
  
Vehicle wiring harnesses and connectors (low beam headlight - H-LP relay, chassis ground)
 -
Clearance lights don't turn on.
 Clearance light bulbs
 -
Clearance light sockets*1
 -
Headlight ASSY
 -
Headlight dimmer switch circuit
  
Vehicle wiring harnesses and connectors (low beam headlight - H-LP relay, chassis ground)
 -
*1: Head light halogen type
*2: Head light discharge type
Tail lights
Symptoms
 Inspection items
 Reference pages
All tail lights (including the clearance lights and the license plate light) don't turn on.
 TAIL fuse
 -
Headlight dimmer switch circuit
  
Tail light circuit
  
Main body ECM (Network gateway computer)
 -
Vehicle wiring harness and connector
 -
One of the tail lights doesn't turn on.
 Rear combination light ASSY
 -
Rear combination light socket & wiring SUB-ASSY
  
Vehicle wiring harness and connector
 -
License plate light
Symptoms
 Inspection items
 Reference pages
The license plate light doesn't turn on.
 License plate light bulb
 -
License plate light ASSY
  
Vehicle wiring harness and connector
 -
Front fog lights
Symptoms
 Inspection items
 Reference pages
Both front fog lights don't turn on.
 FR FOG RH, FR FOG LH fuse
 -
FR FOG relay
 -
Headlight dimmer switch circuit
  
Front fog light circuit
 -
Main body ECM (Network gateway computer)
 -
Vehicle wiring harnesses and connectors (front fog lights - instrument panel junction block ASSY, chassis ground)
 -
One front fog light doesn't turn on.
 Fog light bulb
 -
Vehicle wiring harness and connector
 -
Rear fog light
Symptoms
 Inspection items
 Reference pages
The rear fog light doesn’t turn on.
 RR FOG fuse
 -
RR FOG relay
 -
Rear fog light bulb
 -
Back-up light ASSY
  
Headlight dimmer switch circuit
  
Rear fog light circuit
 -
Main body ECM (Network gateway computer)
  
Vehicle wiring harness and connector (rear fog light - RR FOG relay, chassis ground)
 -
Back-up light
Symptoms
 Inspection items
 Reference pages
All back-up lights don't turn on.
 BK/UP LP fuse
 -
Back-up light switch ASSY *1
  
Neutral start switch ASSY *2
  
Vehicle wiring harness and connector
 -
One of the back-up lights doesn't turn on.
 Back-up light bulb
 -
Rear light sockets & wiring
 -
Vehicle wiring harness and connector
 -
*1: Transmission M/T
*2: Automatic transmission
Stop lights
Symptoms
 Inspection items
 Reference pages
All stop lights don't turn on.
 STOP fuse
 -
Noise filter
  
Stop light switch ASSY
  
Vehicle wiring harness and connector
 -
One of the stop lights doesn't turn on.
 Rear combination light ASSY
 -
Rear combination socket & wiring SUB-ASSY
  
Vehicle wiring harness and connector
 -
Center stop light
Symptoms
 Inspection items
 Reference pages
Stop center light set doesn't turn on.
 Center stop light ASSY
  
Vehicle wiring harness and connector
 -
Turn signal lights
Symptoms
 Inspection items
 Reference pages
All turn signal lights don't turn on.
 GAUGE fuse
 -
Turn signal flasher ASSY
  
Headlight dimmer switch ASSY
  
Vehicle wiring harness and connector
 -
One of the front turn signal lights doesn't turn on.
 Front turn signal light bulb
 -
Headlight ASSY
 -
Front turn signal light socket & wiring LH
  
Vehicle wiring harness and connector
 -
One of the side turn signal lights doesn't turn on.
 Side turn signal light bulb
 -
Side turn signal light ASSY
 -
Side turn signal light socket plug
 -
Vehicle wiring harness and connector
 -
One of the rear turn signal lights doesn't turn on.
 Rear turn signal light bulb
 -
Rear combination light ASSY
 -
Rear combination socket & wiring SUB-ASSY
  
Vehicle wiring harness and connector
 -
Hazard warning signal lights
Symptoms
 Inspection items
 Reference pages
Hazard lights don't function. (Turn signals function normally)
 Turn signal flasher ASSY
  
Clock ASSY
  
Vehicle wiring harness and connector
 -
Light auto cut control
Symptoms
 Inspection items
 Reference pages
Light auto cut system doesn't operate. (other controls function normally)
 Front door courtesy light switch circuit
  
IG signal circuit
  
Main body ECM (Network gateway computer)
 -
Daytime Running Light System
Symptoms
 Inspection items
 Reference pages
Daytime running light system does not operate.
 MPX-B fuse
 -
DRL relay
 -
Low beam headlight relay circuit
  
Taillight relay circuit
  
Main body ECU (network gateway ECU)
 -
Daytime Running Light Resistor
 -
Harness or connector
 -
HOW TO TROUBLESHOOT
1. Bring in the car


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2. Interview and phenomenon check


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3. Communication function inspection of the CAN communication system

(1) Check CAN communication system. (Refer to )
Result
Result
 Go to
Functioning properly
 A
Not functioning properly
 B
B
>To the CAN communication system (Refer to )

A▼

4. DTC check

NOTE:
Refer to .
(1) DTC check
(a) Record the diagnostic codes.
(2) Clear diagnostic code
(3) Do a DTC check again.
(a) Based on the recorded diagnostic codes, reproduce the trouble phenomenon, and check if the diagnostic codes are output again.
NOTE:
When the diagnostic codes are output, see the “List of diagnostic codes” (Refer to )
Result
Result
 Go to
No code, can check and reproduce phenomenon
 A
No code, can't check and reproduce phenomenon
 B
Code is output
 C
B
>See trouble simulation (Refer to )
C
>See inspection step 7

A▼

5. Symptom table

NOTE:
Refer to .
Result
Result
 Go to
Not applicable to the symptom table.
 A
Applicable to the symptom table.
 B
B
>See inspection step 7

A▼

6. Based on the trouble phenomenon, perform troubleshooting following the steps below.

(1) Function check (refer to )
(2) ECM terminal matrix (Refer to )
(3) [Current Data Display & Save] / [System Operation Check Mode] (Refer to )
(4) Symptom table (Refer to )
(5) On-vehicle inspection
(6) Unit inspection

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7. Adjustment, repair, or replacement


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8. Confirmation test


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Complete

CHECK LIST FOR INTERVIEW
CHECKING / CLEARING DIAGNOSTIC CODES
1. Preparation before inspection
(1) Turn the ignition switch to OFF.
2. Checking diagnostic codes (read from the SSM3)
(1) With IG OFF, connect SSM3 to DLC3.
(2) Turn IG to ON, and turn on the SSM3.
(3) Operate following the SSM3 display screen. [Each System Check]→ display the [Integ. unit mode] screen, and select [Diagnostic Code(s) Display].
(4) Check the diagnostic codes.
3. Clearing diagnostic code records (Cleared by the SSM3)
(1) With IG OFF, connect SSM3 to DLC3.
(2) Turn IG to ON, and turn on the SSM3.
(3) Operate following the SSM3 display screen. [Each System Check]→ display the [Integ. unit mode] screen, and select [Clear Memory].
(4) Select [Deletion], and clear the data.
(5) Inspect the diagnosis codes again, and check that the malfunction code was cleared, and that the normal code is displayed.
CAUTION:
·If you can't clear it, start over from IG OFF status.
·Until the cause is identified, do not perform clearing codes with the SSM3.
CUSTOMIZE FUNCTION
1. Customize the lighting system (exterior)
(1) Customize using the SSM3
(a) Connect the SSM3 to the DLC3 and turn the ignition to IG ON.
(b) From the SSM3 display screen, [Each System Check]→[Integ. unit mode]→[Customize]→ select “ Each Item” and customize the settings.
Display name
 Initial setting
 Contents
 Setting
 Controller ECM
[Auto Light Sensitivity]
 ±0%
 Auto light control sensor sensitivity (illumination detection) adjustment function settings (The higher the set value, the easier the light turns on)
-40% / -20% / ±0% / +20% / +40%
 Main body ECM (multiplex network body computer)
CAUTION:
Items without settings are not displayed in the SSM3 or do not function.
CIRCUIT FIGURE
1. HEADLIGHT (w/ HID Headlight)
2. HEADLIGHT (w/o HID Headlight)
3. TURN SIGNAL LIGHT
4. STOP LIGHT
5. DAYTIME RUNNING LIGHT SYSTEM
ECM TERMINAL ARRANGEMENT
1. Main body ECM (network gateway computer), instrument panel junction block ASSY
Captions in illustration
*1
 Instrument panel junction block ASSY
 *2
 Main body ECM (Network gateway computer)
(1) Inspection of the instrument panel junction block ASSY and the main body ECM (network gateway computer)
(a) Remove the main body ECM (network gateway computer) from the instrument panel junction block ASSY.
(b) Measure the voltage and resistance between terminals.
Standard value
Terminal No. (Terminal symbol)
 Inspection conditions
 Standard value
A73-2 (HRLY) ←→ chassis ground
 Always
 11 to 14 V
A73-3 (RFGO) ←→ chassis ground
 Always
 11 to 14 V
A73-4 (GND) ←→ chassis ground
 Always
 Less than 1 Ω
A73-23 ←→ chassis ground
 Always
 11 to 14 V
MB-30 (FFGO) ←→ chassis ground
 When the tail lights are on
 11 to 14 V
D6-1 (GND) ←→ chassis ground
 Always
 Less than 1 Ω
3C-4 ←→ chassis ground
 IG ON
 11 to 14 V
3C-7 ←→ chassis ground
 Always
 11 to 14 V
3E-1 ←→ chassis ground
 Always
 11 to 14 V
NOTE:
If it is outside the standard values, the vehicle is defective.
(c) Install the main body ECM (network gateway computer) on the instrument panel junction block ASSY.
(d) Measure the resistance between the terminals.
Standard value
Terminal No.
 Inspection conditions
 Standard value
D6-13 (CLTE)* ←→ chassis ground
 Always
 Less than 1 Ω
*: When there is auto light control
(e) Measure the voltage between the terminals.
Standard value
Terminal No. (Terminal symbol)
 Inspection conditions
 Standard value
A73-11 (DIM) ←→ chassis ground
 When in key SW OFF, IG OFF, or ACC OFF, light control switch OFF → HEAD
 Less than 1 V → 11 to 14 V
A73-12 ←→ chassis ground
 IG ON, light control switch OFF → HEAD
 11 to 14 V → Less than 1 V
D5-2 (HEAD) ←→ chassis ground
 Key SW ON, light control switch OFF → HEAD*1
 11 to 14 V → Less than 1 V
ACC ON, light control switch OFF → HEAD*2
D5-23 (A)*3 ←→ chassis ground
 Light control switch OFF → AUTO
 11 to 14 V → Less than 1 V
D5-24 (FFOG) ←→ chassis ground
 Front fog light switch OFF → ON
 11 to 14 V → Less than 1 V
D5-25 (TAIL) ←→ chassis ground
 Light control switch OFF → TAIL
 11 to 14 V → Less than 1 V
D5-26 (RFOG) ←→ chassis ground
 Rear fog light switch OFF → ON
 11 to 14 V → Less than 1 V
D6-14 (CLTS)*3 ←→ chassis ground
 IG ON, light control switch is AUTO, automatic control sensor is covered by something that doesn't let light through → exposed
 Pulse generation (changes according to the light) (waveform 1)
D6-15 (CLTB)*3 ←→ chassis ground
 IG ON
 11 to 14 V
MB-18 (HF) ←→ chassis ground
 Headlight dimmer switch (flashing) OFF→ON
 11 to 14 V → Less than 1 V
MB-21 (HU) ←→ chassis ground
 When the light control switch is set to HEAD, LO beam → HI beam
 11 to 14 V → Less than 1 V
*1: When there is no smart entry & start system
*2: When there is a smart entry & start system
*3: When there is auto light control
(2) Waveform 1
Item
 Contents
Inspection terminals
 D6-14 ←→ chassis ground
Equipment setting
 5V/DIV, 5ms/DIV
Inspection conditions
 IG ON, light control switch is AUTO, automatic control sensor is covered by something that doesn't let light through → exposed
*: When there is auto light control
NOTE:
The brighter the area becomes, the shorter the A interval becomes.
CURRENT DATA DISPLAY & SAVE / SYSTEM OPERATION CHECK MODE
1. Inspection with SSM3
(1) Data monitor
(a) Use the SSM3 and data monitor to determine functionality and narrow down the defective part.
SSM3 screen: [Each System Check]→ [Integ. unit mode]→ [Current Data Display & Save]
Item Name
 Description/display range
 Normal value
 Remarks
[Ignition]
 Status of the IG signal
Display range: OFF - ON
 [OFF]: IG OFF
[ON]: IG ON
 -
[ACC SW]
 Status of the ACC signal
Display range: OFF - ON
 OFF: ACC OFF
[ON]: ACC ON
 -
[Dimmer]
 Headlight dimmer switch (HI) status
Display range: OFF - ON
 OFF: the dimmer switch is OFF
ON: the dimmer switch is HI
 -
[Passing Light SW]
 Headlight dimmer switch (flashing) status
Display range: OFF - ON
 OFF: the headlight dimmer switch (flashing) is OFF
ON: the headlight dimmer switch (flashing) is ON
 -
[Lighting I Lamp Output]
 Light control switch (TAIL) status
Display range: OFF - ON
 OFF: the light control switch (TAIL) is OFF
ON: the light control switch (TAIL) is ON
 -
[Lighting II Lamp Output]
 Light control switch (HEAD) status
Display range: OFF - ON
 OFF: the light control switch (HEAD) is OFF
ON: the light control switch (HEAD) is ON
 -
[Lighting Hi Lamp Output]
 Headlight HI beam status
Display range: OFF - ON
 OFF: Normal
ON: Headlight HI beam is lit up
 -
[Rear Fog Light SW]
 Rear fog light switch status
Display range: OFF - ON
 OFF: the rear fog light switch is OFF
ON: the rear fog light switch is ON
 -
[Front Fog Light SW]
 Front fog light switch status
Display range: OFF - ON
 OFF: the front fog light switch is OFF
ON: the front fog light switch is ON
 -
[R fog lamp output]
 Rear fog light status
Display range: OFF - ON
 OFF: the rear fog light is OFF
ON: the rear fog light is ON
 -
[Front Fog Lamp]
 Front fog lights status
Display range: OFF - ON
 OFF: the front fog light is OFF
ON: the front fog light is ON
 -
[Auto Light SW]
 Light control switch (AUTO) status
Display range: OFF - ON
 OFF: the light control switch is OFF
ON: the light control switch is AUTO
 -
[Head Light Switch (H)]
 Light control switch (HEAD) status
Display range: OFF - ON
 OFF: the light control switch is OFF
ON: the light control switch is HEAD
 -
[Tail Light Switch (T)]
 Light control switch (TAIL) status
Display range: OFF - ON
 OFF: the light control switch is OFF
ON: the light control switch is TAIL
 -
[D Door Courtesy]
 Driver's seat door courtesy light switch status
Display range: Open - Close
 Open: the driver side door is opened
Close: the driver side door is closed
 -
[Illumination Rate Info]
 Automatic light control sensor status
Display range: 0 to 65535
 Outputs a number according to the brightness (in units of lx)
 If there is no light, 0 will be displayed.
[Sensitivity]
 Sensitivity of the automatic light control system / Light2, Light1, Normal, Dark1 or Dark2
 Customize setting displayed
 -
[DRL Cancel SW]
 DRL output / ON or OFF
 ON: DRL cancel
OFF: Normal
 -
[DRL Output]
 DRL output / ON or OFF
 ON: DRL output
OFF: Normal
 -
[Light Auto OFF Delay]
 Light auto OFF delay / Off, 30 s,60 s or 90 s
 Customize setting displayed
 -
CAUTION:
Items without settings are not displayed in the SSM3 or do not function.
(2) System Operation Check Mode
(a) Use the SSM3 and the System Operation Inspection Mode to determine functionality and narrow down the defective part.
SSM3 screen: [Each System Check]→ [Integ. unit mode]→ [Work Support]→ [System Operation Check Mode]
Item Name
 Item description
 Drive
[Daytime Running Light]
 Daytime running lights
 ON/OFF
[Taillight Relay]
 Turn on the tail lights.
 OFF - ON
[Headlight Relay]
 Turn on the headlight LO beams.
 OFF - ON
[Head Light Hi]
 Turn on the headlight HI beams.
 OFF - ON
[Front Fog Lamp Output]
 Turn on the front fog lights.
 OFF - ON
[Rear Fog Light Relay]
 Turn on the rear fog light.
 OFF - ON
*1: Perform operation confirmation when the tail lights are on.
CAUTION:
Items without settings are not displayed in the SSM3 or do not function.
DTCB1244 Malfunction in the auto light sensor
Circuit description
The automatic light control sensor converts the detected brightness of its surrounding area into an electric signal and outputs that to the main body ECM (network gateway computer). Based on that signal, the main body ECM (network gateway computer) turns the headlights and tail lights on and off.
DTC NO.
 Diagnosis contents
 Inspection parts
B1244
 IG ON, light control switch is AUTO and abnormal light sensor brightness signal input detected
·Automatic light control sensor
·Main body ECM (Network gateway computer)
·Vehicle wiring harnesses and connectors (sensor input system)
Circuit figure
Inspection steps
4. Inspection of the automatic light control sensor

(1) Perform an on-vehicle inspection of the automatic light control sensor. (Refer to )
NG
>Replacement of the automatic light control sensor (Refer to )

OK▼
Replacement of the main body ECM (network gateway computer) (Refer to )

Low beam headlight circuit
Circuit description
The turning on and off of the low beam headlights is controlled by the main body ECM (network gateway computer).
Circuit figure
Inspection steps
CAUTION:
Before performing the troubleshooting, check the fuse of this circuit.
2. Unit inspection for the headlight relay (H-LP relay)

(1) Remove the H-LP relay from the engine compartment relay block ASSY.
(2) Perform the unit inspection of the H-LP relay. (Refer to )
NG
>Replacement of the H-LP relay.

OK▼

High beam headlight circuit
Circuit description
The turning on and off of the high beam headlights is controlled by the main body ECM (network gateway computer).
Circuit figure
Inspection steps
CAUTION:
Before performing the troubleshooting, check the fuse of this circuit.
2. Unit inspection for the headlight dimmer relay (DIM relay)

(1) Remove the DIM relay from the engine compartment relay block ASSY.
(2) Perform the unit inspection of the DIM relay. (Refer to )
NG
>Replacement of the headlight dimmer relay (DIM relay)

OK▼

Tail light circuit
Circuit description
The turning on and off of the tail lights, the clearance lights, and the license plate light is controlled by the main body ECM (network gateway computer).
Circuit figure
Inspection steps
CAUTION:
Before performing the troubleshooting, check the fuse of this circuit.
2. Inspection of the wiring harnesses and connectors (battery - instrument panel junction block ASSY)

(1) Disconnect the connector 3E of the instrument panel junction block ASSY.
(2) Measure the voltage between the terminals.
Voltage
Inspection terminals
 Inspection conditions
 Standard value
3E-1 - chassis ground
 Always
 11 to 14 V
Captions in illustration
*a
 Connector not connected
(Instrument panel junction block ASSY)
NG
>Repair or replacement of wiring harness or connector

OK▼

Headlight dimmer switch circuit
Circuit description
The main body ECM (network gateway computer) receives the light control switch signal, the dimmer switch signal, and the fog switch signal from the headlight dimmer switch ASSY.
Circuit figure
Inspection steps
2. Unit inspection of the headlight dimmer switch ASSY

(1) Remove the headlight dimmer switch ASSY. (Refer to )
(2) Perform the unit inspection of the headlight dimmer switch ASSY. (Refer to )
NG
>Replacement of the headlight dimmer switch ASSY (Refer to )

OK▼

4. Unit inspection of the headlight dimmer switch ASSY

(1) Remove the headlight dimmer switch ASSY. (Refer to )
(2) Perform the unit inspection of the headlight dimmer switch ASSY. (Refer to )
NG
>Replacement of the headlight dimmer switch ASSY (Refer to )

OK▼

5. Inspection of wiring harnesses and connectors (headlight dimmer switch ASSY - main body ECM (network gateway computer))

(1) Disconnect the connector MB and D5 of the main body ECM (network gateway computer).
(2) Measure the resistance between the terminals.
Resistance (open circuit check)
for LHD
Tester Connection
 Condition
 Specified Condition
D50-2 (B) - D5-26 (RFOG)*3
 Always
 Below 1 Ω
D50-4 (BFG) - D5-24 (FFOG)*2
 Always
 Below 1 Ω
D50-20(H) - D5-2 (HEAD)
 Always
 Below 1 Ω
D50-19 (A) - D5-23 (A)*1
 Always
 Below 1 Ω
D50-18(T) - D5-25 (TAIL)
 Always
 Below 1 Ω
D50-12 (EL) - Body ground
 Always
 Below 1 Ω
D50-3 (LFG) - Body ground
 Always
 Below 1 Ω
for RHD
Tester Connection
 Condition
 Specified Condition
D50-7 (B) - D5-26 (RFOG)*3
 Always
 Below 1 Ω
D50-9 (BFG) - D5-24 (FFOG)*2
 Always
 Below 1 Ω
D50-11(H) - D5-2 (HEAD)
 Always
 Below 1 Ω
D50-12 (A) - D5-23 (A)*1
 Always
 Below 1 Ω
D50-13(T) - D5-25 (TAIL)
 Always
 Below 1 Ω
D50-19 (EL) - Body ground
 Always
 Below 1 Ω
D50-8 (LFG) - Body ground
 Always
 Below 1 Ω
Resistance (short circuit check)
for LHD
Tester Connection
 Condition
 Specified Condition
D50-2 (B)*3 - Body ground
 Always
 10 kΩ or higher
D50-4 (BFG)*2 - Body ground
 Always
 10 kΩ or higher
D50-20 (H) - Body ground
 Always
 10 kΩ or higher
D50-19 (A)*1 - Body ground
 Always
 10 kΩ or higher
D50-18 (T) - Body ground
 Always
 10 kΩ or higher
for RHD
Tester Connection
 Condition
 Specified Condition
D50-7 (B)*3 - Body ground
 Always
 10 kΩ or higher
D50-9 (BFG)*2 - Body ground
 Always
 10 kΩ or higher
D50-11 (H) - Body ground
 Always
 10 kΩ or higher
D50-12 (A)*1 - Body ground
 Always
 10 kΩ or higher
D50-13 (T) - Body ground
 Always
 10 kΩ or higher
*1: w/ Automatic Light Control System
*2: w/ Front Fog Light
*3: w/ Rear Fog Light
NG
>Repair or replacement of wiring harness or connector

OK▼
See the next circuit for inspection shown on the symptom table. (Refer to )

Front fog light circuit
Circuit description
The turning on and off of the front fog lights are controlled by the main body ECM (network gateway computer).
Circuit figure
Inspection steps
CAUTION:
Before performing the troubleshooting, check the fuse of this circuit.
1. Light inspection

(1) Check that tail lights turn on.
Criteria :  Light turns on.
NG
>To the symptom table (Refer to )

OK▼

3. Unit inspection of the instrument panel junction block ASSY.

(1) Remove the instrument panel junction block ASSY from the vehicle. (Refer to )
(2) Remove the main body ECM (network gateway computer) from the instrument panel junction block ASSY.
(3) Measure the voltage between the terminals when battery voltage is applied between the terminals.
Voltage
Inspection terminals (Terminal symbol)
 Inspection conditions
 Standard value
MB-30 (FFGO) - chassis ground
 Battery positive → 3E-1
Battery ground → MB-7 (TRLY)
 11 to 14 V
3C-3 - chassis ground
 Battery positive → 3E-1
Battery ground → MB-30 (FFGO), MB-7 (TRLY)
 11 to 14 V
3C-5 - chassis ground
 Battery positive → 3E-1
Battery ground → MB-30 (FFGO), MB-7 (TRLY)
 11 to 14 V
Captions in illustration
*a
 Connector not connected
(Instrument panel junction block ASSY)
 -
 -
NG
>Replacement of the instrument panel junction block ASSY (Refer to )

OK▼
See the next circuit for inspection shown on the symptom table. (Refer to )

Rear fog light circuit
Circuit description
The turning on and off of the rear fog light are controlled by the main body ECM (network gateway computer).
Circuit figure
Inspection steps
CAUTION:
Before performing the troubleshooting, check the fuse of this circuit.
1. Light inspection

(1) Check that tail lights turn on.
Criteria :  Light turns on.
NG
>To the tail light circuit (Refer to )

OK▼

3. Inspection of the rear fog light relay (RR FOG)

(1) Remove the rear fog light relay.
(2) Perform the unit inspection of the rear fog light relay. (Refer to )
NG
>Replacement of the rear fog light relay (RR FOG relay)

OK▼

4. Unit inspection of the back-up light ASSY

(1) Remove the back-up light ASSY. (Refer to )
(2) Perform the unit inspection of the back-up light ASSY. (Refer to )
NG
>Replacement of the back-up light ASSY (Refer to )

OK▼