CAN COMMUNICATION SYSTEM FAIL-SAFE CHART


  1. FAIL-SAFE FUNCTION


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

    2. Effects on each system when communication is impossible (for further details, see the pages for each system).

      Function

      1. Control Master

      2. System Related

      3. Control Actuator

      		 Vehicle Behavior User Notification Diagnostic Trouble Code

      Air Conditioning

      (Performs compressor solenoid drive control according to the air conditioning cut signal.)

      1. Air conditioning amplifier assembly

      2. ECM

      3. -

      • When there is a transmission stop: No behavior change.

      • When there is a reception stop: Operation is prohibited.

      • When there is a periodic malfunction: Previous values maintained.

      		 Nothing -

      Air Conditioning

      (Performs PTC drive control according to the PTC heater drive prohibition signal.)

      1. Air conditioning amplifier assembly

      2. ECM

      3. -

      • When there is a transmission stop: No behavior change.

      • When there is a reception stop: Operation is prohibited.

      • When there is a periodic malfunction: Previous values maintained.

      		 Nothing -

      Air Conditioning

      (Performs magnetic clutch drive control according to the air conditioning cut signal.)

      1. Air conditioning amplifier assembly

      2. ECM

      3. -

      • When there is a transmission stop: No behavior change.

      • When there is a reception stop: Operation is prohibited.

      • When there is a periodic malfunction: Previous values maintained.

      		 Nothing -

      Air Conditioning

      (Performs ambient temperature correction control according to the ambient temperature signal.)

      1. Air conditioning amplifier assembly

      2. Combination meter assembly

      3. -

      • When there is a transmission stop: No behavior change.

      • When there is a reception stop: When the ignition switch is turned from off to ON and there is no backup, control is performed at a temperature of 15°C [59°F]. (Previous values are maintained for all other cases.)

      • When there is a periodic malfunction: Previous values maintained.

      		 Nothing -

      Tachometer

      (Displays the tachometer.)

      1. Combination meter assembly

      2. ECM

      3. -

      		 The tachometer displays 0 rpm.

      • The tachometer displays 0 rpm.

      • The drive monitor stops calculating.

      		 U0100

      Leveling

      (Adjust the vertical beam axis direction of the headlights according to the pitch angle calculated using the wheel speeds and vehicle height sensor value.)

      1. Headlight leveling ECU assembly

      2. ECM, Combination meter assembly

      3. -

      		 Previous values are maintained during signal interruption and leveling control continues. Nothing

      • U0100

      • U0155

      Auto Leveling Indicator Light

      (Monitors leveling system malfunctions and when a malfunction is detected, illuminates/blinks the indicator in the meter.)

      1. Headlight leveling ECU assembly

      2. Headlight leveling ECU assembly

      3. Combination meter assembly

      		 Maintains the auto leveling indicator light state.

      • When there is a transmission stop:


        • Valve checks when the ignition switch is turned to ON are not performed.

        • Indicator light does not blink when initialization is incomplete and vehicle specifications have not been written.

      • When there is a periodic malfunction: The blinking cycle when the indicator light blinks (when initialization is incomplete and vehicle specifications have not been written) is irregular.

      		 -

      LED Open Circuit Detection

      (When there is an LED malfunction, illuminates the LED headlight warning light according to the malfunction signal from the headlight leveling ECU assembly.)

      1. Headlight leveling ECU assembly

      2. Headlight leveling ECU assembly

      3. Combination meter assembly

      		 Maintains the LED headlight warning light state.

      • Valve checks when the ignition switch is turned to ON are not performed.

      • If communication is lost when there is an LED malfunction, the LED headlight warning light does not illuminate.

      		 -

      Air Conditioning-linked Control

      (Performs idle up according to the compressor load. Performs air conditioning cut control.)

      1. ECM

      2. Air conditioning amplifier assembly

      3. Air conditioning amplifier assembly

      		 Air conditioning-linked control does not operate. Air conditioning does not operate. -

      PTC Heater

      (Performs idle up according to requests from the PTC heater [including coolant heater] or heater system.)

      1. ECM

      2. Air conditioning amplifier assembly

      3. ECM

      		 The PTC heater does not operate.

      • The PTC heater does not operate.

      • The idling speed changes.

      • Heater performance becomes worse.

      		 -

      Charging Control

      (Performs idle up according to charging requests.)

      1. Certification ECU (smart key ECU assembly)

      2. Air conditioning amplifier assembly

      3. ECM

      • Idle up according to charging requests is not performed.

      • Charging control is not prohibited.

      • Idle up according to charging requests is not performed.

      • The tail lights flicker and the blower airflow volume changes.

      		 -

      ECT System Indicator

      (Indicates the shift position, states of switches, system modes, etc.)

      1. ECM

      2. -

      3. Combination meter assembly

      		 Nothing ECT system indicators do not illuminate. -

      Cruise Control

      (Adjusts the engine throttle valve opening amount automatically to control the vehicle.)

      1. ECM

      2. Combination meter assembly

      3. ECM

      		 The cruise control does not operate. The cruise indicator blinks. -

      Eco-drive Indicator

      Eco-drive Indicator (Displays information to the driver to encourage eco-driving.)

      1. ECM

      2. -

      3. Combination meter assembly

      		 Nothing No information is displayed. -

      Smart Entry and Start Function

      (Smart entry and start warnings)

      1. Certification ECU (smart key ECU assembly)

      2. ECM, Combination meter assembly, Certification ECU (smart key ECU assembly)

      3. Combination meter assembly

      		 Maintains previous values.

      • When there is a transmission stop or a continuous bus off condition is detected: The smart entry and start warnings (key lock-in prevention warning, passenger has brought key out of vehicle warning, key reminder warning, etc.) do not operate.

      • When there is a reception stop with the meter ECU or a periodic malfunction: The smart entry and start warnings (key lock-in prevention warning, passenger has brought key out of vehicle warning, key reminder warning, etc.) operate incorrectly.

      • When there is a reception stop with the ECM: Incorrect smart entry and start warnings are output.

      • U0100

      • U0155

      Push Start (Power Supply Switching)

      (Using the push start switch signal as a trigger, sends a starter drive request when the power supply automatically switches and conditions are met.)

      1. Certification ECU (smart key ECU assembly)

      2. ECM, Combination meter assembly

      3. -

      		 Nothing When the engine is turned off, the smart key indicator light blinks red according to a "vehicle information malfunction" judgment.

      • U0100

      • U0155

      Start Control

      (Starts the engine when the push start switch is pushed once.)

      1. Certification ECU (smart key ECU assembly)

      2. ECM

      3. -

      		 When there is a CAN communication malfunction, the direct line determines that starter turnoff has occurred and cranking is stopped. Nothing U0100