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Home >> Subaru >> 2016 >> BRZ Series.HyperBlue >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Entry Start System Start System (Keyless Start) >> Entry & Start System (Start Function) >> DTC B2284: Brake Signal (Cable-Information Does Not Match To BEAN-Information) >> Circuit description
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Circuit description

The collation ECM (smart key ECM assembly) receives brake signal information from 2 sources. It receives signals from the stop light assembly via the direct line, and receives signals from the ECM via CAN communication. If the information sent from these 2 sources are different, this DTC is output.

NOTE: If you remove and then reconnect the battery cable, the power returns to the mode it was before you removed the cable.
DTC DETECTION CONDITION

DTC No. DTC detection status Faulty part DTC Output Confirmation Operation
B2284 The brake signal information via the direct line and the brake signal information sent from the ECM via CAN communication do not match (1-trip detection logic(1)).
  • AM2 No. 2 fuse
  • Stop fuse
  • Collation ECM (smart key ECM assembly)
  • EFI system
  • Wiring harness or connector
 Connect the cable to the battery ground terminal (-), and after 20 seconds or more since turning the brake off, turn it on again and wait 20 seconds or more.
(1) The code is output only when the problem is found and the engine switch is on (IG).

Vehicle status and failsafe function when a problem is detected

VEHICLE STATUS AND FAILSAFE FUNCTION PROBLEM DETECTED

Vehicle status when a problem is detected Failsafe function when a problem is detected
If the electrical key transmitter sub-assembly is in the vehicle interior, even if you perform engine start operations, the engine will not start (the entry key indicator on the combination meter assembly will not light up green). However, if you press engine switch for a certain period of time after the power mode is turned on (ACC), you can start the engine.
  • If a problem is found in the direct line [ON], even if the brake is off, you can press the engine switch and start the engine.
  • If a problem is found in the direct line [OFF], even if the brake is on, you cannot press the engine switch and start the engine.
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Related [Current Data Display & Save] and [System Operation Check Mode] items

DTC DESCRIPTION

DTC No. [Current Data Display & Save] items [System Operation Check Mode] items
B2284 Power supply
  • [Stop Light Switch 1]

Engine
  • [Brake Switch 1]
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