DTC B2285: Steering Lock Position Signal Circuit Malfunction; DTC B2288: Steering Lock Signal Circuit Malfunction: Procedure

1. Connect Techstream to the DLC3.
2. Turn the power switch on (IG) and press Techstream main switch on.
3. Preform the Active Test according to the displays on the tester.
   POWER SOURCE CONTROL ECU:
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   P Supply for Steering Lock	Power supply for steering lock	ON / OFF	-

   OK

   When ON is selected, power is supplied to the steering lock ECU.

NG → See step   2 

OK → GO TO STEERING LOCK FUNCTION Found In  STEERING LOCK SYSTEM 

1. Delete the DTC. Refer to DTC CHECK / CLEAR .

   HINT: 

   After all DTCs are cleared, check if the trouble occurs again 5 seconds after the engine switch is turned on (IG).

2. Check for DTCs again.

   OK

   No DTC is output.

OK → END 

NG: Go to next step 

1. Disconnect the D44 ECU connector.
   Fig 1: View Of Disconnected D44 ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D14 ECU connector.
   Fig 2: View Of Disconnected D14 ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Resistance

   Terminal No. (Symbol)	Specified Condition
   D44-26 (SLP) - D14-4 (SLP1)	Below 1 Ω
   D44-26 (SLP) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. After replacing the power source control ECU with a normally functioning ECU, check that the steering lock unlocks.

   OK

   Steering lock unlocks.

NG → GO TO STEERING LOCK FUNCTION Found In  STEERING LOCK SYSTEM 

OK → END (POWER SOURCE CONTROL ECU DEFECTIVE)