B2284

2AZ-FXE STARTING: SMART KEY SYSTEM: B2284: Brake Signal Malfunction

DTC B2284 - Brake Signal Malfunction

DESCRIPTION

This DTC is output when: 1) the brake signal circuit between the main body ECU and the stop light switch is malfunctioning; and 2) the CAN information is inconsistent.
HINT: When the main body ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.
After the main body ECU is replaced, perform the registration procedures for the engine immobiliser system Programming and Relearning.





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Before performing the inspection, depress the brake pedal and check that the stop lights come on. If the stop lights do not come on when the brake pedal is depressed, refer to Symptom Related Diagnostic Procedures.

PROCEDURE

1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)
(a) Connect Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Check the DATA LIST for proper functioning of the stop light switch.

Main Body:





OK:
ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen.
NG -- INSPECT FUSE (STOP)
OK -- Continue to next step.
2. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)
(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for CAN communication system DTCs How to Proceed With Troubleshooting.
HINT: If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first Diagnosis System.

OK:
No DTC is output.
NG -- GO TO CAN COMMUNICATION SYSTEM
OK -- Continue to next step.
3. CHECK DTC OUTPUT (HYBRID CONTROL SYSTEM)
(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for hybrid control system DTCs Hybrid Control System.
OK:
No DTC is output.
NG -- GO TO HYBRID CONTROL SYSTEM
OK -- REPLACE MAIN BODY ECU
4. INSPECT FUSE (STOP)
(a) Remove the STOP fuse from the instrument panel J/B.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
5. CHECK WIRE HARNESS (BATTERY - MAIN BODY ECU)




(a) Disconnect the IL ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR
NG -- Continue to next step.
6. INSPECT STOP LIGHT SWITCH




(a) Remove the switch.
(b) Measure the resistance of the switch.
Standard resistance:






NG -- REPLACE STOP LIGHT SWITCH
OK -- REPLACE MAIN BODY ECU