DTC B2285: Steering Lock Position Signal Circuit Malfunction: Procedure

1. Check the DTCs. Refer to DTC CHECK / CLEAR .

   OK

   LIN communication system DTC B2785 is not output simultaneously.

   HINT: 

   • If the steering wheel cannot be locked or unlocked, the power switch cannot be turned on (IG) and the EV control system cannot be started.
   • If LIN communication is not available, the steering wheel cannot be locked or unlocked.

NG → See step   9 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Techstream Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Steering Unlock Switch	State of steering unlock sensor signal output from steering lock ECU (steering lock actuator assembly) / OFF or ON	OFF: Steering locked ON: Steering unlocked	When the shift lever is in P and the power switch is off, if any door is opened or closed, the steering is locked. When the electrical key transmitter sub-assembly is inside the vehicle and the power switch is turned on (ACC) or on (IG), the steering unlocks. The EV control system cannot be started when the steering unlock signal is off.

   RESULT
   
   

   Result	Proceed to
   Data List item does not change	A
   Data List item changes	B

B → See step   7 

A: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 1: Measuring Resistance Of Steering Lock ECU (Steering Lock Actuator Assembly) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Positive (+) tester probe → C18-4 (SLP1) Negative (-) tester probe → Body ground	Steering locked*	10 kΩ or higher
   Positive (+) tester probe → C18-4 (SLP1) Negative (-) tester probe → Body ground	Steering unlocked*	Below 1 Ω

   HINT: 

   • *: If any of the doors are opened then closed with the shift lever in P and the power switch off, the steering wheel will be locked. If the power switch is then turned on (ACC) or on (IG), the steering wheel will be unlocked.
   • DTC B2285 may be stored due to a malfunction in the steering lock ECU (steering lock actuator assembly). The steering lock position signal and unlock position signal are sent from the steering lock ECU (steering lock actuator assembly) to the power management control ECU individually.
   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Steering Lock ECU - Steering Lock Actuator Assembly)

NG → See step   7 

OK: Go to next step 

1. Disconnect the C21 power management control ECU connector.
2. Disconnect the C18 steering lock ECU (steering lock actuator assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C21-7 (SLP) - C18-4 (SLP1)	Always	Below 1 Ω
   C21-7 (SLP) or C18-4 (SLP1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8