B2278

2UR-FSE STARTING: SMART ACCESS SYSTEM WITH PUSH-BUTTON START: B2278: Power Switch Circuit Malfunction
B2278 - Power Switch Circuit Malfunction

DESCRIPTION

This DTC is output when: 1) a malfunction is detected between the main body ECU and the power switch; or 2) either of the switches inside the power switch is malfunctioning.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING THE TECHSTREAM (START SWITCH 1, 2)

(a) Use the Data List to check if the power switch is functioning properly.

Main Body





OK:

When the power switch is turned ON (IG), ON is displayed on the Techstream screen.

NG -- INSPECT POWER SWITCH
OK -- Continue to next step.

2. CHECK POWER SWITCH (SWITCH CONDITION)

(a) Ensure the key is inside the cabin.

(b) With the brake pedal released, check that the power source mode changes as shown below each time the power switch is pushed.

OK:

OFF -> ON (ACC) -> ON (IG) -> OFF

NG -- GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (POWER SOURCE MODE DOES NOT CHANGE) Power Source Mode Does Not Change

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

3. INSPECT POWER SWITCH





(a) Disconnect the L36 power switch connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE POWER SWITCH Removal
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - POWER SWITCH, BODY GROUND)





(a) Disconnect the L13 main body ECU connector.

(b) Disconnect the L36 power switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU