DTC B2285: Steering Lock Position Signal Circuit Malfunction [12/2017 - 10/2020]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart Access / Trouble Codes.
5. Check for DTCs.

   Body Electrical > Smart Access > Trouble Codes 

   HINT: 

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

   Result

   Result	Proceed to
   DTC B2785 is not output.	A
   DTC B2785 is output.	B

Result: 

B 

GO TO DTC B2785. Refer to  DTC B2785: Communication Malfunction between ECUs Connected by LIN [12/2017 - 10/2022] 

Result: 

A 

See step  2

1. Enter the following menus: Body Electrical / Power Source Control / Data List.
2. Read the Data List according to the display on the Techstream.

   Body Electrical > Power Source Control > Data List 

   Tester 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 with ECU assembly)	OFF or ON	OFF: Steering locked ON: Steering unlocked	When the shift state is in part (P) and the engine switch is off, if any door is opened or closed, the steering is locked. When the electrical key transmitter sub-assembly is in the cabin and the engine switch is turned on (ACC) or on (IG), the steering unlocks. The engine cannot be started when the steering unlock signal is off.

   Body Electrical > Power Source Control > Data List 

   Tester Display
   Steering Unlock Switch

   OK

   The Techstream display changes correctly in response to the steering lock/unlock status.

   Result

   Result	Proceed to
   Techstream display does not change	A
   Techstream display changes	B

Result: 

B 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR WITH ECU ASSEMBLY). Refer to  DISASSEMBLY [12/2017 - 10/2022] 

Result: 

A 

See step  3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   G22-4 (SLP1) -Body ground	Steering locked →unlocked*	11 to 14 V→Below 1.5 V

   HINT: 

   • *: If any of the doors are opened with the shift state park (P) and the engine switch off, the steering will be locked. If the engine switch is turned on (ACC) or on (IG) with the electrical key transmitter sub-assembly in the cabin, the steering will be unlocked.
   • DTC B2285 may be stored due to a malfunction in the steering lock ECU (steering lock actuator with ECU assembly). The steering lock position signal and unlock position signal are sent from the steering lock ECU (steering lock actuator with ECU assembly) to the certification ECU (smart key ECU assembly) individually.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR WITH ECU ASSEMBLY). Refer to  DISASSEMBLY [12/2017 - 10/2022] 

Result: 

OK 

See step  4

1. Disconnect the G22 steering lock ECU (steering lock actuator with ECU assembly) connector.
2. Disconnect the G71 certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G71-14 (SLP) - G22-4 (SLP1)	Always	Below 1 Ω
   G71-14 (SLP) or G22-4 (SLP1) - Other terminals and body ground	Always	10 kΩ or higher

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   G71-14 (SLP) or G22-4 (SLP1) - Body ground	Always	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR