DTC B22AB: Open in Starter Switch Terminal: Procedure

WARNING: This page is about a different car, the 2012 Lexus LS 460. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ELECTRIC POWER CONTROL ECU (STSW SIGNAL)

Fig 1: Identifying A69 ECU Connector Terminals

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Disconnect the A69 ECU connector.

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

Standard voltage

Tester Connection	Switch Condition	Specified Condition
A69-12 (STSW) - Body ground	Engine switch on (IG) → cranking	Below 1 V → 8 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (PASSENGER SIDE JUNCTION BLOCK - MAIN BODY ECU)

OK → REPLACE PASSENGER SIDE JUNCTION BLOCK (ELECTRIC POWER CONTROL ECU)