DTC B2285: Steering Lock Position Signal Circuit Malfunction [09/2014 - ]: Procedure

1. Check for DTCs (Refer to DTC CHECK / CLEAR [09/2014 - ] ).

   OK

   LIN communication system DTC B2785 is not output simultaneously.

   HINT: 

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

Result: 

NG 

GO TO DTC B2785 

(Refer to DTC B2785: Communication Malfunction between ECUs Connected by LIN [09/2014 - ] )

Result: 

OK 

See step  2

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 / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Steering Unlock Switch	State of steering unlock sensor signal output from steering lock actuator assembly/ON or OFF	ON: Steering unlocked OFF: Steering locked	When the shift lever is in P and the engine switch is off, if any door is opened then closed, the steering is locked. When the key is inside the vehicle 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.

   Result

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

Result: 

B 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) 

(Refer to PROCEDURE - Step 1 )

Result: 

A 

See step  3

See step  1, or see step  1

Result: 

NG 

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

Result: 

OK 

See step  4

See step  2, or see step  2

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Choose the model to be inspected.

   Result

   Result	Proceed to
   except Lexus Enform Remote Compatible Type	A
   for Lexus Enform Remote Compatible Type	B

Result: 

B 

See step  8

Result: 

A 

See step  6

1. Disconnect the N93 connector from the certification ECU (smart key ECU assembly).
2. Disconnect the N24 connector from the steering lock ECU (steering lock actuator assembly).
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N93-26 (SLP) - N24-4 (SLP1)	Always	Below 1 Ω
   N93-26 (SLP) or N24-4 (SLP1) - Body ground		10 kΩ or higher

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   N93-26 (SLP) or N24-4 (SLP1) - Body ground	Always	Below 1 V

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Reconnect the N24 steering lock ECU (steering lock actuator assembly) connector.
2. Reconnect the N93 certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Positive (+) tester probe → N24-4 (SLP1) Negative (-) tester probe → Body ground	Steering locked*	10 kΩ or higher
   	Steering unlocked*	Below 1 Ω

   HINT: 

   • *: If any of the doors are opened then closed with the shift lever in P and the engine switch off, the steering wheel will be locked. If the engine 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 certification ECU (smart key ECU assembly) individually.
   TEXT IN ILLUSTRATION
   
   

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

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL [09/2014 - ] )

Result: 

NG 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) 

(Refer to PROCEDURE - Step 1 )

1. Disconnect the N93 certification ECU (smart key ECU assembly) connector.
2. Disconnect the N24 steering lock ECU (steering lock actuator assembly) connector.
3. Disconnect the N87 DCM (telematics transceiver) connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N93-26 (SLP) - N24-4 (SLP1)	Always	Below 1 Ω
   N24-4 (SLP1) - N87-29 (SLPD)	Always	Below 1 Ω
   N93-26 (SLP) or N24-4 (SLP1) or N87-29 (SLPD) - 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
   N93-26 (SLP) or N24-4 (SLP1) or N87-29 (SLPD) - Body ground	Always	Below 1 V

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Reconnect the N24 steering lock ECU (steering lock actuator assembly) connector.
2. Reconnect the N93 certification ECU (smart key ECU assembly) connector.
3. Disconnect the N87 DCM (telematics transceiver) connector.
4. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Positive (+) tester probe → N24-4 (SLP1) Negative (-) tester probe → Body ground	Steering locked*	10 kΩ or higher
   	Steering unlocked*	Below 1 Ω

   HINT: 

   • *: If any of the doors are opened then closed with the shift lever in P and the engine switch off, the steering wheel will be locked. If the engine 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 certification ECU (smart key ECU assembly) individually.
   TEXT IN ILLUSTRATION
   
   

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

Result: 

NG 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) 

(Refer to PROCEDURE - Step 1 )

Result: 

OK 

See step  10

1. Disconnect the N87 DCM (telematics transceiver) connector.
2. 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.

   OK

   Engine starts.

   HINT: 

   Check the steering lock ECU (steering lock actuator assembly) and certification ECU (smart key ECU assembly) connectors connected.

Result: 

OK 

REPLACE DCM (TELEMATICS TRANSCEIVER) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL [09/2014 - ] )