DTC B2285: Steering Lock Position Signal Circuit Malfunction [12/2019 - 10/2021]: Procedure

1. Check for DTCs.

   Body Electrical > Smart Key > Trouble Codes 

   HINT: 

   • If the steering cannot be unlocked, the ignition switch cannot be turned to ON and the engine cannot be started.
   • If LIN communication is not available, the steering cannot be locked or unlocked.

   OK

   LIN communication system DTC B2785 is not output simultaneously.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO DTC B2785. Refer to  DTC B2785: Communication Malfunction between ECUs Connected by LIN [12/2019 - 10/2021] 

Result: 

OK 

See step  2

1. Read the Data List according to the display on the GTS.

   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 or upper bracket assembly)	OFF or ON	OFF: Steering locked ON: Steering unlocked	When the shift lever is in P and the ignition 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 ignition switch is turned to ACC or ON, 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 GTS display changes.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY). Refer to  DISASSEMBLY [12/2019 - 10/2021] 

Result: 

NG 

See step  3

1. Measure the resistance 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 or Upper Bracket Assembly))

   Standard Resistance

   Tester Connection		Condition	Specified Condition
   H52-4 (SLP1) - Body ground	Positive (+) tester probe → H52-4 (SLP1) Negative (-) tester probe → Body ground	Steering locked → unlocked*	10 kΩ or higher → Below 1 Ω

   HINT: 

   • *: If any of the doors are opened with the shift lever in P and the ignition switch off, the steering will be locked. If the ignition switch is turned to ACC or ON 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 or upper bracket assembly). The steering lock position signal and unlock position signal are sent from the steering lock ECU (steering lock actuator or upper bracket assembly) to the certification ECU (smart key ECU assembly) individually.

   Result

   Result	Proceed to
   OK (except Toyota Entune Remote Connect Compatible Type)	A
   OK (for Toyota Entune Remote Connect Compatible Type)	B
   NG	C

Result: 

B 

See step  5

Result: 

C 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY). Refer to  DISASSEMBLY [12/2019 - 10/2021] 

Result: 

A 

See step  4

1. Disconnect the H48 certification ECU (smart key ECU assembly) connector.
2. Disconnect the H52 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H48-14 (SLP) - H52-4 (SLP1)	Always	Below 1 Ω
   H48-14 (SLP) or H52-4 (SLP1) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the H48 certification ECU (smart key ECU assembly) connector.
2. Disconnect the H52 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
3. Disconnect the H11 DCM (telematics transceiver) connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H48-14 (SLP) - H52-4 (SLP1)	Always	Below 1 Ω
   H52-4 (SLP1) - H11-30 (SLPD)	Always	Below 1 Ω
   H48-14 (SLP), H52-4 (SLP1) or H11-30 (SLPD) - Other terminals and body ground	Always	10 kΩ or higher

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H48-14 (SLP), H52-4 (SLP1) or H11-30 (SLPD) - Body ground	Always	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Check the push-button start function.
   1. Enter the vehicle while carrying an electrical key transmitter sub-assembly.
   2. Depress the brake pedal with the shift lever in P.
   3. Check that the engine starts when the engine switch is pressed.

   Result

   Result	Proceed to
   Engine starts	A
   Engine does not start	B

Result: 

A 

REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

B 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2019 - 11/2023]