DTC B2275: STSW Monitor Malfunction: Procedure

WARNING: This page is about a different car, the 2012 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR DTC
1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch on (IG).
3. After 15 seconds have elapsed, check if the trouble occurs again.
  OK
  
  DTC B2273 is not output.
NG → See step 2

OK → See step 4

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - ECM)

Disconnect the E52 ECU connector.

Fig 1: Identifying E52 ECU And A50 ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the A50 ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E52-4 (STSW) - A50-14 (STSW)	Always	Below 1 Ω
E52-4 (STSW) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - ECM)

OK: Go to next step

INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

Reconnect the E52 connector.

Fig 2: E52 Connector Terminal Identification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Voltage

Tester Connection	Condition	Specified Condition
E52-4 (STSW) - Body ground	Brake pedal depressed, Engine switch hold on (ST)	Output voltage at terminal AM1 or AM2 is -2 V or more.

NG → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

OK → See step 5

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING
REPLACE ECM. Refer to REMOVAL