Subaru Legacy BN/BS (2015-2019) Service Manual: General diagnostic table inspection

Diagnostic code

DTC is not displayed when inspecting all DTCs.

DTC is not displayed.

Perform the diagnosis according to DTC.

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Clearance light

(Low beam)

(High beam)

Clearance light and low/high beams illuminate normally when the switch is operated. Indicator in the meter illuminates at the same time.

System is normal.

Check the lighting system, combination meter system and LAN system.

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Auto light

When the area around the light control sensor is darkened after the ignition switch and the lighting switch (AUTO) are turned to ON, the clearance light and the low beam illuminate after 15 seconds. Indicator in the combination meter illuminates at the same time.

System is normal.

Check the lighting system, combination meter system and LAN system.

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When the ignition switch and the lighting switch (AUTO) are turned to ON after the area around the light control sensor is darkened, the clearance light and the low beam illuminate immediately. Indicator in the combination meter illuminates at the same time.

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Fog light

Front fog light illuminates when the switch is operated. Indicator in the meter illuminates at the same time.

System is normal.

Check the lighting system, combination meter system and LAN system.

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Rear defogger

Rear defogger operates when the switch is operated. The indicator illuminates at the same time.

System is normal.

Check the rear window defogger system and A/C system.

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Wiper deicer

Wiper deicer operates by operating the switch. The indicator illuminates at the same time.

When the ambient temperature is 5°C (41°F) or higher, press the switch 3 seconds or more to forcibly activate the system.

System is normal.

Check the wiper deicer system and A/C system.

Wiper deicer operates when “Wiper deicer setting” of the body integrated unit is set to on.

DRL

After starting the engine and releasing the parking brake with shift lever in other than P range, the DRL illuminates.

System is normal.

Check the lighting system and LAN system.

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Rear wiper

Rear wiper operates when the switch is operated.

System is normal.

Check wiper or washer system.

Depending on user customizing “Sedan/Wagon Setting” of the body integrated unit, vehicle sensory time varies.

Key interlock

System is normal.

Check the body control system.

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Shift lock

The select lever can be moved from the P range to other ranges only when the brake pedal is depressed with IG ON.

System is normal.

Check the body control system.

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Door lock

The doors lock/unlock when the door switch is operated. Rear gate/trunk opens when the rear gate/trunk release switch is operated.

System is normal.

Check the security & lock and body control system.

If user customizing “Sedan/Wagon Setting” is different, trunk and rear gate do not open.

Keyless entry

The lock locks/unlocks when the keyless transmitter is operated. Trunk/rear gate unlocks when trunk/rear gate unlock button is operated.

System is normal.

Check the keyless entry and body control system.

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Keyless access with push button start system

The lock locks/unlocks when the access key is operated.

With the access key held, the touch sensor (lock) operation locks/touch sensor (unlock) operation unlocks.

Rear gate unlocks by operating the rear gate unlock button.

System is normal.

Check the keyless access with push button start system and the body control system.

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Answer back

Answer-back operates when the keyless entry / keyless access with push button start system locks/unlocks.

System is normal.

Check the security & lock, keyless access with push button start system, and LAN system.

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Room light

Turns ON/OFF according to the door open/close operation, the lock/unlock operation with the keyless entry/keyless access with push button start system, and the ignition operation.

System is normal.

Check the room light system, security & lock, keyless access with push button start system, and LAN system.

For vehicle with the keyless access with push button start system, the room light blinks when “Factory mode” is selected.

For vehicles with the keyless entry, the room light blinks when the keyless registration mode is selected.

Map light

Turns ON/OFF according to the door open/close operation, the lock/unlock operation with the keyless entry/keyless access with push button start system, and the ignition operation. (Except for rear gate)

System is normal.

Check the spot map light, security & lock, keyless access with push button start system, and LAN system.

For vehicle with the keyless access with push button start system, the map light blinks when “Factory mode” is selected.

For vehicles with the keyless entry, the map light blinks when the keyless registration mode is selected.

Luggage room light

The light illuminates/goes off according to the rear gate open/close. The light goes off, when the doors are locked with the keyless entry/keyless access with push button start system, or the ignition is turned to ON, while the light is illuminating.

System is normal.

Check the lighting system (interior light system), security & lock, keyless access with push button start system, and LAN system.

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Trunk room light

The light illuminates/goes off according to the trunk open/close.

System is normal.

Check the lighting system (interior light system), security & lock, keyless access with push button start system, and LAN system.

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Key illumination

The light illuminates/goes off according to the driver’s door open/close.

The light goes off, when the doors are locked with the keyless entry/keyless access with push button start system and the ignition is turned ON while illuminating.

System is normal.

Check the ignition switch illumination, security & lock, and LAN system.

For vehicles with keyless entry, the key illumination blinks when “Factory” mode is selected.

Turn signal & hazard

Each turn signal light illuminates, when the turn signal switch is turned ON.

The hazard light and indicator in the combination meter blink, when the hazard switch is turned ON.

System is normal.

Check the lighting system (turn signal light and hazard light system).

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Engine start

Engine starts.

System is normal.

Check the engine system, immobilizer, and LAN system.

Model without keyless access with push button start system

Vehicle security

Security monitoring/security canceling can be performed by operating the keyless entry/keyless access with push button start system.

System is normal.

Check the security & lock, keyless access with push button start system, and LAN system.

Security monitoring starts and at the same time the warning buzzer sounds, when impact sensor is not connected and user customizing “Impact Sensor” of the body integrated unit is set to on.

Welcome lighting (enter)

When dimming out around the light control sensor after turning the lighting switch (AUTO) to ON, use keyless transmitter or access key to unlock. At this time, the clearance light and headlight low beam illuminates for the preset time.

And, use keyless transmitter or access key to lock. At this time, the clearance light and headlight low beam go off.

System is normal.

Check the lighting system (auto light), security & lock (keyless entry) or keyless access with push button start system.

Operates when user customization item “Illumination Sensor Setting” in body integrated unit is set to ON and “Welcome Light Off Delay Time(Approaching)” is set to other than OFF.

Welcome lighting (exit)

The clearance light and headlight low beam continues to illuminate, when the ignition switch is OFF (or when the key is removed for vehicles without keyless access with push button start system) while the auto light function is operating.

Use keyless transmitter or access key to lock two consecutive times. At this time, the clearance light and headlight low beam go off.

System is normal.

Check the lighting system (auto light), security & lock (keyless entry) or keyless access with push button start system.

Operates when user customization item “Illumination Sensor Setting” in body integrated unit is set to ON and “Welcome Light Off Delay Time(Exiting)” is set to other than OFF.