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Failsafe List

WARNING: This page is about a different car, the 2018 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.
  1. Failsafe function
    1. If a failure occurs on any of the bus (communication line) due to short circuit and other reasons, the fail safe function switches the process on the defective bus to a predefined bus to protect against malfunction.
    2. Behavior of each system in case of lost communication (For details, refer to the description of each system)
      Function Control master (Main ECM that controls the process) Relevant ECMs Behavior in case of lost communication Notification to driver Notification method Diagnostic codes ([ECM which saves DTC])
      Speed display (Display the data on speedmeter based on vehicle speed signal sent by the brake actuator ASSY) Combination meter ASSY Brake actuator ASSY Assume the input signal indicates 0 km/h Yes  
      • Display 0 km/h on the speed meter
      • Stop the driving monitor calculation
      		 U0122
      [Combination meter ASSY]
      Odo/trip meter (Receive vehicle speed signal and display the travel distance) Combination meter ASSY Brake actuator ASSY Stop calculation and continue to display the last data until IG-OFF No - U0122
      [Combination meter ASSY]
      Tachometer (Receive the engine speed signal and display the data on tachometer) Combination meter ASSY Engine control computer Assume the input signal indicates 0 r/min Yes Display 0 r/min on the tachometer U0100
      [Combination meter ASSY]
      Airbag (Turn ON/OFF the airbag warning light) Combination meter ASSY Airbag sensor ASSY Assume the input signal indicates "Active" Yes Turn ON the airbag warning light U0151
      [Combination meter ASSY]
      EPS warning (Turn ON/OFF the EPS warning light) Combination meter ASSY Power steering computer ASSY Assume the input signal indicates "Active" Yes Turn ON the EPS warning light U0131
      [Combination meter ASSY]
      SLIP warning (Turn ON/OFF the SLIP warning light) Combination meter ASSY Brake actuator ASSY Assume the input signal indicates "Active" Yes Turn ON the SLIP warning light U0122
      [Combination meter ASSY]
      Smart function (Smart lock/smart unlock/smart trunk open) Collation ECM (Smart key computer ASSY)  
      • Main body ECM (Multiplex network body computer)
      • Combination meter ASSY
      		 Activate the smart unlock-retry Yes  
      • Disable the smart lock/smart unlock/smart trunk open
      • Disable the smart alert (lockout, key theft, key reminder) and disable the key lockout prevention control
      • Disable the smart illumination
      		 U0140, U0155, U0422 [Collation ECM (Smart key computer ASSY)]
      Engine ignition SW light control (Turn ON/OFF the engine ignition switch light) Collation ECM (Smart key computer ASSY) Main body ECM (Multiplex network body computer)  
      • If the engine ignition SW light is ON (with dome light): turn OFF
      • If DC cut fuse is pulled and the engine ignition SW light is ON (panel light): turn OFF
      		 Yes  
      • If the engine ignition SW light is ON (with dome light): turn OFF
      • If DC cut fuse is pulled and the engine ignition SW light is ON (panel light): turn OFF
      		 U0140, U0422 [Collation ECM (Smart key computer ASSY)]
      Push button start (Power supply switching) Collation ECM (Smart key computer ASSY)  
      • Main body ECM (Multiplex network body computer)
      • Combination meter ASSY
      • Engine control computer
      		 - Yes Do not display the start operation U0100, U0140, U0155, U0422 [Collation ECM (Smart key computer ASSY)]
      Electric load control (Idle-up is enabled due to electric load, etc.) Engine control computer  
      • Main body ECM (Multiplex network body computer)
      • Air conditioner amplifier ASSY
      		 Disable idle-up due to electric load, etc. Yes Idle speed changes -
      Air conditioner cooperation (Enable idle-up/air conditioner cut control via compressor load) Engine control computer Air conditioner amplifier ASSY Disable the air conditioner cooperation (no idle-up) Yes Stop the air conditioner -
      Integrated control (VSC) (By estimating the required driving force (torque) based on the acceleration, control the driving force (torque) characteristics as required to realize stability under constant velocity driving, improve starting, reacceleration, and acceleration) Engine control computer  
      • Collation ECM (Smart key computer ASSY)
      • Brake actuator ASSY
      • Spiral cable SUB-ASSY
      • Brake actuator ASSY
      		 Disable the functions to estimate the required driving force (torque) based on the acceleration and control the driving force (torque) characteristics as required to realize stability under constant velocity driving, improve starting, reacceleration, and acceleration Yes Disable the functions to estimate the required driving force (torque) based on the acceleration and control the driving force (torque) characteristics as required to realize stability under constant velocity driving, improve starting, reacceleration, and acceleration -
      ECT system indicator display (Display shift, S/W, mode on the meter) Transmission control computer ASSY Combination meter ASSY Disable the indicators Yes Indicators are OFF -
      AI-SHIFT control (Automatic transmission control to improve engine braking force and acceleration) Transmission control computer ASSY Brake actuator ASSY AI-SHIFT control is disabled No - -
      N control (Reduce the engine load and activate idle-up) Transmission control computer ASSY Brake actuator ASSY Disable N control No - -
      Coast down shift (Switch the coast down speed change point according to air conditioner load) Transmission control computer ASSY Air conditioner amplifier ASSY Coast down shock becomes more apparent No - -
      Shift-up delay due to heating request (Activate the shift-up delay due to heating request) Transmission control computer ASSY Air conditioner amplifier ASSY Shift-up delay due to heating request is disabled No - -
      ABS/VSC/TRC control (Anti-wheel-lock in sudden braking) (Improve stability of the vehicle to protect against skidding while turning and wheel slip when starting the vehicle) Brake actuator ASSY  
      • Engine control computer
      • Spiral cable SUB-ASSY
      • Airbag sensor ASSY
      		 ABS/VSC/TRC control is disabled Yes  
      • Brake warning light is ON
      • ABS warning light is ON
      • Slip indicator light is ON
      		 U0100
      U0126
      [Brake actuator ASSY]
      EPS control (Adaptive torque control in response to vehicle speed) Power steering computer ASSY Engine control computer Assist stops or degraded
      • (steering wheel becomes heavy)
      		 Yes - U0100
      [Power steering computer ASSY]
      Brake actuator ASSY ESP indicator is ON U0122
      U0416
      [Power steering computer ASSY]
      Air conditioner control (Water temperature correction control) Air conditioner amplifier ASSY Engine control computer  
      • Temperature information (IG ON): use the default value (80°C)
      • Engine type (IG ON): use the default value
      • (depends on the model)
      • IG-OFF: none
      		 No - U0100
      U0401
      [Air conditioner amplifier ASSY]
      Simple load control (Restrict the simple electric load control depending on load control level) Air conditioner amplifier ASSY Power steering computer ASSY  
      • The last data is retained while IG- ON (if reset, the load control is disabled)
      • IG-OFF: none
      		 No - U0100
      U0401
      [Air conditioner amplifier ASSY]
      Panel dimmer control (A/C control pattern switch, HCAV control switch, indicator dimmer control) Air conditioner amplifier ASSY Main body ECM (Multiplex network body computer)  
      • The last data is retained while IG- ON (if reset, the load control is disabled)
      • IG-OFF: none
      		 Yes Rear defroster switch is disabled U0140
      U0422
      [Air conditioner amplifier ASSY]
      Destination identification control (Identify the destination) Air conditioner amplifier ASSY Main body ECM (Multiplex network body computer)  
      • The last data is retained while IG-ON
      • IG-OFF: none
      		 Yes Rear defroster switch is disabled U0140
      U0422
      [Air conditioner amplifier ASSY]
      Ambient temperature correction control (Switch the operation status of air conditioner and correct the ambient temperature display value based on the vehicle signal) Air conditioner amplifier ASSY Combination meter ASSY  
      • SPD (IG ON): control using the default value (0 km)
      • IG-OFF: none
      		 No  
      • The consistency between the ambient temperature and the display value is reduced
      • The level of A/C air flow volume correction goes down
      		 U0155
      U0423
      [Air conditioner amplifier ASSY]
      Event data recorder (EDR) (If EDR record criteria is met, the status data regarding the vehicle speed, accelerator pedal opening angle, and shift position is logged) Airbag sensor ASSY  
      • Brake actuator ASSY
      • Engine control computer
      		 "Invalid data" is logged in the event data recorder (EDR) No - -
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