Toyota CH-R Service Manual: Fail-safe Chart

Toyota CH-R Service Manual / Networking / Can Communication System / Fail-safe Chart

FAIL-SAFE CHART

FAIL-SAFE FUNCTION

(a) When communication fails in any of the CAN bus lines (communication lines), a fail-safe function(s) will operate. The fail-safe function that is specified for each system operates to prevent those systems from malfunctioning.

(b) The following table shows the effects on each system when communication is impossible. (For further details, see the pages for each system.)

Function

Control Master

(Main ECU to determine controls)

System Related

Fail-safe Operation

Driver Detectable

DTC Detection

(ECU that stored DTC)

ABS control

Brake actuator assembly

-

Only EBD control is available.
  • ABS warning light illuminates.
  • SLIP indicator illuminates.
  • Brake warning light illuminates.

U0073

(Brake actuator assembly)

VSC control

Brake actuator assembly
  • ECM
  • Steering sensor
  • Airbag sensor assembly
  • VSC is disabled.
  • Only EBD control is available.
  • ABS warning light illuminates.
  • SLIP indicator illuminates.
  • Brake warning light illuminates.

U0073

U0100

U0123

U0126

(Brake actuator assembly)

TRAC control

Brake actuator assembly
  • ECM
  • Steering sensor
  • Airbag sensor assembly
  • TRAC is disabled.
  • Only EBD control is available.
  • ABS warning light illuminates.
  • SLIP indicator illuminates.
  • Brake warning light illuminates.

U0073

U0100

U0123

U0126

(Brake actuator assembly)

Hill-start Assist Control

  • Maintains brake torque in order to prevent the vehicle from rolling backwards when stopped on an uphill road.

Brake actuator assembly
  • ECM
  • Steering sensor
  • Airbag sensor assembly
  • Hill-start assist control is disabled.
  • Only EBD control is available.
  • ABS warning light illuminates.
  • SLIP indicator illuminates.
  • Brake warning light illuminates.

U0073

U0100

U0123

U0126

(Brake actuator assembly)

PCS Control

  • Applies the brakes based on information from the radar/camera system in order to avoid a collision.

Brake actuator assembly

Millimeter wave radar sensor assembly

PCS brake control is disabled.
  • ABS warning light illuminates.
  • SLIP indicator light illuminates.
  • Brake warning light illuminates.

U0073

(Brake actuator assembly)

ACC Control

  • Applies the brakes based on information from the radar/camera system in order to follow the vehicle in front.

Brake actuator assembly

ECM

ACC brake control is disabled.
  • ABS warning light illuminates.
  • SLIP indicator light illuminates.
  • Brake warning light illuminates.

U0073

(Brake actuator assembly)

Brake Hold Control

  • Maintains the brake oil pressure when the vehicle is stopped.

Brake actuator assembly
  • ECM
  • Steering sensor
  • Airbag sensor assembly
  • Main body ECU (multiplex network body ECU)

Brake hold control is disabled.
  • ABS warning light illuminates.
  • SLIP indicator illuminates.
  • Brake hold operated indicator light blinks.
  • Brake warning light illuminates.

U0073

U0100

U0123

U0126

U0142

(Brake actuator assembly)

DAR Control

  • Automatically releases EPB when accelerator pedal is depressed while EPB is still in a locked condition.

Brake actuator assembly
  • ECM
  • Steering sensor
  • Airbag sensor assembly

DAR control is disabled.
  • ABS warning light illuminates.
  • SLIP indicator illuminates.
  • Brake warning light illuminates.
  • Electric parking brake warning light illuminates.

U0073

U0100

U0123

U0126

U0142

(Brake actuator assembly)

Vehicle Speed Display

Combination meter assembly

Brake actuator assembly

Speedometer is controlled based on a default vehicle speed of 0 km/h (0 mph).

-

U0129

(Combination meter assembly)

Tachometer Display

Combination meter assembly

ECM

Needle of tachometer remains at 0 rpm.

-

U0100

(Combination meter assembly)

Meter Display

  • Displays vehicle condition and controls indicator lights.

Combination meter assembly
  • Power steering ECU assembly
  • Airbag sensor assembly
  • Brake actuator assembly
  • ECM
  • Forward recognition camera
  • Headlight ECU sub-assembly LH
  • Vehicle information is not displayed.
  • Lights do not illuminate or lights remain illuminated.

-

U0100

U0129

U0131

U0151

U0182

(Combination meter assembly)

Air Conditioning Control

  • Corrects engine speed, such as for idle up.
  • Controls outlet air temperature, outlet mode change and airflow volume based on engine coolant temperature signal.

Air conditioning amplifier assembly

ECM
  • If the target frame cannot be received, the previous values are kept.
  • When it is judged that there is a communication interruption, value is set to 80°C (176°F).

-

U0100

(Air conditioning amplifier assembly)

Compressor Control

  • Judges compressor lock according to engine speed.

Air conditioning amplifier assembly

ECM

If the target frame cannot be received, the previous values are kept.

-

U0100

(Air conditioning amplifier assembly)

Simple Load Control

  • Performs electric load control according to load control level signal.

Air conditioning amplifier assembly

Power steering ECU assembly

If the target frame cannot be received, the previous values are kept.

-

U0131

(Air conditioning amplifier assembly)

Panel Dimming Control

  • Outputs dimming information to the A/C panel according to the display dimming information.

Air conditioning amplifier assembly

Main body ECU (multiplex network body ECU)

If the target frame cannot be received, the previous values are kept.

-

U0142

(Air conditioning amplifier assembly)

Destination Determination Control

  • Switches the A/C control pattern according to the destination information.

Air conditioning amplifier assembly

Main body ECU (multiplex network body ECU)

If the target frame cannot be received, the previous values are kept.

-

U0142

(Air conditioning amplifier assembly)

Ambient Temperature Correction Control

  • Switches air conditioning system operation condition and corrects value of displayed ambient temperature according to vehicle speed signal.

Air conditioning amplifier assembly

Combination meter assembly
  • If the target frame cannot be received, the previous values are kept.
  • When it is judged that there is a communication interruption, value is set to 0 km/h (0 mph)

-

U0155

(Air conditioning amplifier assembly)

Solar Calibration Control

  • Calibrates air conditioning control using the value from the solar sensor.

Air conditioning amplifier assembly

Main body ECU (multiplex network body ECU)
  • If the target frame cannot be received, the previous values are kept.
  • When it is judged that there is a communication interruption, value is set to 0 W/m2.

-

U0142

(Air conditioning amplifier assembly)

Outside temperature compensation control

  • Based on outside air temperature sensor data values, air conditioning control compensation and outside air temperature display output value compensation are performed.

Air conditioning amplifier assembly

Main body ECU (multiplex network body ECU)

If the target frame cannot be received, the previous values are kept.

-

U0142

(Air conditioning amplifier assembly)

Freeze frame data output function

  • Controlled according to timestamp request specifications.

Air conditioning amplifier assembly

Central gateway ECU (network gateway ECU)

If the target frame cannot be received, the previous values are kept.

-

-

Blind Spot Monitor Control

  • Detects vehicle in blind spot of adjacent lane and informs driver.

Blind spot monitor sensor LH
  • Steering sensor
  • Brake actuator assembly
  • Main body ECU (multiplex network body ECU)
  • ECM

-

Displays messages on the multi-information display.

U0100

U0126

U0129

U0142

(Blind spot monitor sensor LH)

LDA System

  • Sounds an alarm when deviating from the lane, and performs steering assist toward the center of the lane.

Forward recognition camera
  • ECM
  • Steering sensor
  • Brake actuator assembly
  • Power steering ECU assembly
  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly
  • Millimeter wave radar sensor assembly

Control stops.
  • Displays messages on the multi-information display.
  • Buzzer sounds.

U0100

U0123

U0126

U0129

U0131

U0142

U0155

U0235

U023A

(Forward recognition camera)

Automatic High Beam Function

  • High Beam Light Distribution Control

Forward recognition camera
  • ECM
  • Main body ECU (multiplex network body ECU)
  • Steering sensor
  • Brake actuator assembly

The current state is maintained.
  • Buzzer sounds.
  • Displays messages on the multi-information display.

B124B

(Main body ECU (multiplex network body ECU))

Road Sign Assist Function

  • Road Sign Assist

Forward recognition camera
  • Brake actuator assembly
  • Airbag sensor assembly

Road sign assist function is canceled.
  • Buzzer sounds.
  • Displays messages on the multi-information display.

U0123

U0129

(Forward recognition camera)

Dynamic Radar Cruise Control System

  • Accelerates or decelerates the vehicle to maintain the distance to the vehicle ahead.

Millimeter wave radar sensor assembly
  • Brake actuator assembly
  • Airbag sensor assembly
  • ECM

Control stops.

Displays messages on the multi-information display.

U0100

U0125

U0126

U0129

(Millimeter wave radar sensor assembly)

Pre-collision System

  • Controls the brakes immediately before a crash.

Millimeter wave radar sensor assembly
  • ECM
  • Forward recognition camera
  • Brake actuator assembly
  • Steering sensor
  • Airbag sensor assembly

Control stops.
  • Displays messages on the multi-information display.
  • Buzzer Sounds.

U0100

U0125

U0126

U0129

U0235

U023A

U1002

(Millimeter wave radar sensor assembly)

Entry Function

  • Entry lock/unlock and back door unlatch
  • Warning
  • Performs entry illumination (Interior illumination, etc.).
  • Displays messages to inform the driver that it is possible to start the SFI system.
  • Main body ECU (multiplex network body ECU)
  • Certification ECU (smart key ECU assembly)
  • ECM
  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly
  • Entry lock/ unlock or back door unlatch does not operate.
  • Warning functions (Key confinement, Key not in vehicle, Key reminder etc.) do not operate, Key confinement prevention control does not operate.
  • Entry illumination does not operate.

-

U0100

U0142

U0155

(Certification ECU (smart key ECU assembly))

Wireless Function

  • Operates the wireless lock/unlock functions, etc.

Certification ECU (smart key ECU assembly)

Main body ECU (multiplex network body ECU)

Wireless lock/unlock function do not operate.

-

U0142

(Certification ECU (smart key ECU assembly))

Engine Switch Backlighting Control

  • Turns on/off engine switch illumination linked with interior lights etc.

Certification ECU (smart key ECU assembly)

Main body ECU (multiplex network body ECU)
  • When the engine switch backlight is not illuminated:

    Does not illuminate.

  • When the engine switch backlight is illuminated as the DOME light illuminates:

    Does not turn off.

-

U0142

(Certification ECU (smart key ECU assembly))

Security Indicator Display Function

  • Displays the immobiliser security condition.

Certification ECU (smart key ECU assembly)

Main body ECU (multiplex network body ECU)

Security condition cannot display normally (illuminates during security warning preparation/security warning).

-

U0142

(Certification ECU (smart key ECU assembly))

Cranking hold control

  • It is control that user can start engine by one-pushing engine SW. (Cranking hold)

Certification ECU (smart key ECU assembly)

ECM

When CAN communication is failure, cranking stop is judged by direct NE.

-

-

Power Steering Control

  • Calculates assist current according to torque sensor value and vehicle speed and drives motor.

Power steering ECU assembly
  • ECM
  • Brake actuator assembly
  • Airbag sensor assembly
  • Steering sensor
  • Control is performed temporarily with the steering assist amount set to that used when the vehicle speed is 100 km/h (62 mph).
  • Zero point learning is not performed.
  • Drivability degrades (compensation control using steering angle is stopped).

EPS warning light illuminates.

U0100

U0129

(Power steering ECU assembly)

Assist Map Selection

  • Selects proper assist map according to destination, engine type, etc.

Power steering ECU assembly

ECM

Default map is used to assist because proper assist map cannot be selected. (Steering feel may be different.)

EPS warning light illuminates.

C1581

(Power steering ECU assembly)

VDIMα System

  • Calculates current to be used for steering assist according to commanded value from VSC, and then operates motor.

Power steering ECU assembly

Brake actuator assembly

VDIMα control is stopped.

-

U0129

(Power steering ECU assembly)

Engine/Hybrid Toggle

  • So that the same parts can be used for conventional and hybrid vehicles, this toggles the communication type.

Power steering ECU assembly

ECM

Control is performed temporarily with the steering assist amount set to that used when the vehicle speed is 100 km/h (62 mph).

EPS warning light illuminates.

U0100

(Power steering ECU assembly)

Engine System Indicator Display

  • Estimates whether injectors are clogged and requests that a message be displayed informing user that injectors need maintenance.
  • Estimates whether oil has deteriorated and requests that a message be displayed informing user that oil needs to be replaced.

ECM

Combination meter assembly
  • System is unable to inform user that oil needs to be replaced or injectors need maintenance.
  • Combination meter display cannot be cleared.

-

-

Electric Load Control

  • Performs idle up according to electric load.

ECM
  • Air conditioning amplifier assembly
  • Power steering ECU assembly
  • Main body ECU (multiplex network body ECU)

Idle up according to electric load is not performed.

Not possible. (Idle speed changes.)

-

Air Conditioning Cooperative Operation

  • Performs idle up according to compressor load.
  • Performs air conditioning cut control.

ECM

Air conditioning amplifier assembly

Air conditioning system does not use cooperative controls. (Idle up is not performed.)

Air conditioning system does not operate.

-

Charge Control

  • Performs idle up according to charging request.

ECM
  • Air conditioning amplifier assembly
  • Main body ECU (multiplex network body ECU)

Idle up according to charging request is not performed.

Taillights flicker and blower airflow changes.

-

Sprung mass damping control

  • Uses transitional driving force control is to improve behavior (pitch, bounce) of sprung vehicle mass when disturbed.

ECM

Brake actuator assembly

Sprung vehicle mass damping control does not operate. Does not use transitional driving force control to improve behavior (pitch, bounce) of sprung vehicle mass when disturbed.

-

-

Eco Driving Indicator

  • Displays information to the driver to encourage Eco-driving.

ECM

-

-

No information is displayed.

-

Integrated Control (VDM)

  • Estimates the driver requested torque based on the accelerator pedal operation and performs torque characteristic control according to driving conditions so that driveability, acceleration performance and acceleration feeling are improved.

ECM
  • Millimeter wave radar sensor assembly
  • Brake actuator assembly
  • Airbag sensor assembly
  • Steering sensor

Does not estimate the driver requested torque based on the accelerator pedal operation and does not perform torque characteristic control according to driving conditions and as a result, driveability, acceleration performance and acceleration feeling are not improved.

-

-

Eco Control

  • Adjusts throttle response in consideration of actual fuel economy.

ECM
  • Air conditioning amplifier assembly
  • Main body ECU (multiplex network body ECU)

Eco mode does not operate.

-

-

ECT System Indicator Display

  • Meter display (Displays shift position, states of switches, system modes, etc.)

ECM

Combination meter assembly

Indicator light does not illuminate.

-

-

Neutral Control

  • Reduces engine load and performs idle up.

ECM
  • Brake actuator assembly
  • Airbag sensor assembly

Neutral control is not performed.

-

U0129

(ECM)

Coast Downshift Timing Change According to Air Conditioning Load

  • Delays upshifts according to warm-up request.

ECM

Air conditioning amplifier assembly

Coast downshift does not occur.

Coast downshift shock reduction performance deteriorates.

-

Cruise Control

  • Controls vehicle speed by adjusting throttle valve angle automatically.

ECM
  • Millimeter wave radar sensor assembly
  • Brake actuator assembly
  • Combination meter assembly

Cruise control does not operate.

Displays messages on the multi-information display.

-

Headlight Leveling Control (Headlight Control)

  • Adjusts headlights vertical aiming according to wheel speed and vehicle pitch angle determined using vehicle height sensor.

Headlight ECU sub-assembly LH
  • Brake actuator assembly
  • Main body ECU (multiplex network body ECU)

Control stops.

-

U0129

U0142

(Headlight ECU sub-assembly LH)

Headlight Leveling Indicator

  • Monitors leveling system malfunctions and when a malfunction is detected, sends an indicator illumination request to the combination meter assembly.

Headlight ECU sub-assembly LH

Combination meter assembly

Maintains the leveling indicator state.

-

U0155

(Headlight ECU sub-assembly LH)

Destination Identification

  • Checks if the destination information stored in the headlight ECU sub-assembly LH and the destination information data transmitted in the CAN bus lines are the same.

Headlight ECU sub-assembly LH
  • ECM
  • Main body ECU (multiplex network body ECU)

-

-

U0100

U0142

(Headlight ECU sub-assembly LH)

Low Beam Headlights, High Beam Headlights, Clearance Lights and Side Marker Lights

  • Turns the specified light source on and off according to low beam, high beam command data.

Main body ECU (multiplex network body ECU)

Headlight ECU sub-assembly LH

The low beam headlights, clearance lights and side marker lights are forcibly illuminated.

-

U0142

(Headlight ECU sub-assembly LH)

LED Headlight Indicator

  • Monitors low beam LED malfunctions and when a malfunction is detected, sends an indicator illumination request to the meter.

Headlight ECU sub-assembly LH

Combination meter assembly

Maintains the LED headlight indicator status.
  • Buzzer sounds.
  • Displays messages on the multi-information display.

U0073

U1000

(Headlight ECU sub-assembly LH)

Door Lock

  • Controls key linked and automatic door lock/unlock function, key confinement prevention function, etc.

Main body ECU (multiplex network body ECU)

Airbag sensor assembly

Key linked door lock/unlock function is performed even when the ignition switch is ON and the driver seatbelt is fastened.

-

U0151

(Main body ECU (multiplex network body ECU))

Alarm

  • Sounds various warnings.

Main body ECU (multiplex network body ECU)
  • ECM
  • Certification ECU (smart key ECU assembly)

-

-

U0100

U0120

(Main body ECU (multiplex network body ECU))

Automatic Dimming of Display

  • Controls display dimming control.

Main body ECU (multiplex network body ECU)

Combination meter assembly

Automatically performs display dimming control when tail mode is not canceled (when the light sensor illuminance signal value is less than the display dimming value, the interior displays and indicators are dimmed).

-

U0155

(Main body ECU (multiplex network body ECU))

Illumination

  • Performs illumination control.

Main body ECU (multiplex network body ECU)
  • Certification ECU (smart key ECU assembly)
  • ECM
  • The dome light turns off.
  • The outside handle illumination turns off.
  • The foot light is adjusted.

The dome light does not turn off immediately after exiting the vehicle.

U0101

U0327

(Main body ECU (multiplex network body ECU))

Diagnostic/C-BEST

  • Diagnostic phase 4 communication.

-

All ECUs connected to CAN

Exits diagnostic mode.

-

-

Occupant Classification System

  • Acquires information about passengers for deployment of SRS components.

Airbag sensor assembly

Occupant detection ECU

SRS components do not deploy.

SRS warning light illuminates.

U0154

(Airbag sensor assembly)

Smart Key Function/Wireless

  • Controls smart key function/wireless functions.

Certification ECU (smart key ECU assembly)

Certification ECU (smart key ECU assembly)

Entry lock/unlock control not possible.

-

U0327

(Main body ECU (multiplex network body ECU))

Lighting Control

  • Controls the daytime running lights.

Main body ECU (multiplex network body ECU)

ECM

Daytime running light control is not performed.

-

U0100

(Main body ECU (multiplex network body ECU))

TPMS

  • Monitors the tire pressure and meter speed, etc. and operates the meter indicators and multi-information display.

Main body ECU (multiplex network body ECU)

Combination meter assembly

Sends an initial communication value to the BERKES.

The tire pressure monitor sensor indicator in the combination meter assembly blinks for 1 minute and then stays illuminated.

U0155

(Main body ECU (multiplex network body ECU))

Automatic High Beam

  • Detects oncoming traffic, vehicles ahead, street lights, etc. using an onboard sensor and automatically turns the high beam lights on and off.

Main body ECU (multiplex network body ECU)
  • Headlight ECU sub-assembly LH
  • Forward recognition camera

The system does not operate.
  • Buzzer sounds.
  • Displays messages on the multi-information display.

U023A

(Main body ECU (multiplex network body ECU))

Lighting Control

  • The headlight ECU controls the loading around the headlights (body ECU sends an illumination request to headlight ECU)

Headlight ECU sub-assembly LH

Main body ECU (multiplex network body ECU)

-
  • Buzzer sounds.
  • Displays messages on the multi-information display.

U0182

(Main body ECU (multiplex network body ECU))

Occupant Detection

Occupant detection ECU
  • Brake booster with master cylinder assembly
  • Airbag sensor assembly

Sends signals indicating a malfunction to the airbag sensor assembly.

SRS warning light illuminates.

U0125

U0129

(Occupant detection ECU)

Destination Identification

  • Identifies destination based on destination and destination package information, and selects the time zone and language used for the display.

Radio and display receiver assembly

Main body ECU (multiplex network body ECU)

Determines the destination according to the last received value and operates accordingly (if there is no last received value, the system operates using the default value).

Time zone and language selection screen are different from actual destination.

U0073

U0140

(Radio and display receiver assembly)

Vehicle Customize Function

  • Changes the behavior and control parameters of various functions (illumination lighting time, etc.) according to the user operation via the screen.

Radio and display receiver assembly
  • Air conditioning amplifier assembly
  • Main body ECU (multiplex network body ECU)
  • Certification ECU (smart key ECU assembly)
  • When an application that uses phase 4 remote communication is activated (customization/remote diagnosis), the process will be performed regardless of main body ECU (multiplex network body ECU) remote communication permit/prohibit state.
  • The enter button is grayed out and selection is not possible.
  • Performs customization according to diagnostic communication
  • Retries 3 times

-

U0073

(Radio and display receiver assembly)

Meter-linked Function

  • Changes display based on customization information set through the meter.
  • Outputs the customization information set in the system.

Radio and display receiver assembly

Combination meter assembly
  • Language, unit and accent color linking: Maintains the last valid settings.
  • GS search: Performs control without confirming if there is a GS search request. Uses the last valid settings. Grays out the settings to prevent them from being changed when displayed.

-

U0073

U0155

(Radio and display receiver assembly)

Information Sound Adjustment Function

  • Receives flags from the millimeter wave radar sensor assembly to operate the alarm, and limits or mutes multimedia audio while the alarm is in operation.

Radio and display receiver assembly

Forward recognition camera

Audio mute is canceled.

-

U0073

(Radio and display receiver assembly)

TOYOTA Entune System

  • Guest Driver Monitor

DCM (telematics transceiver)

Combination meter assembly

Function is disabled.

Notification displayed on smart phone via the application.

U0155

(DCM (telematics transceiver))

TOYOTA Entune System

  • Vehicle Status Alerts

DCM (telematics transceiver)

Main body ECU (multiplex network body ECU)

Function is disabled.

Notification displayed on smart phone via the application.

U0142

(DCM (telematics transceiver))

TOYOTA Entune System

  • Remote Door Lock and Unlock

DCM (telematics transceiver)

Main body ECU (multiplex network body ECU)

Function is disabled.

Notification displayed on smart phone via the application.

U0142

U0198

(DCM (telematics transceiver))

TOYOTA Entune System

  • Diag communication arbitration

DCM (telematics transceiver)

Radio and display receiver assembly

Function is disabled.

-

U0163

(DCM (telematics transceiver))

TOYOTA Entune System

  • Display request

DCM (telematics transceiver)

Radio and display receiver assembly

Function is disabled.

-

U0163

(DCM (telematics transceiver))

TOYOTA Entune System

  • Vehicle Status Report

DCM (telematics transceiver)
  • Combination meter assembly
  • Main body ECU (multiplex network body ECU)

Function is disabled.

Notification displayed on smart phone via the application.

U0142

U0155

(DCM (telematics transceiver))

TOYOTA Entune System

  • Remote Engine Start and Stop

DCM (telematics transceiver)

Main body ECU (multiplex network body ECU)

Function is disabled.

Notification displayed on smart phone via the application.

U0142

(DCM (telematics transceiver))
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