DTC B2285: Steering Lock Position Signal Circuit Malfunction: Procedure

1. Check for DTCs. Refer to DTC CHECK / CLEAR [06/2012 - ] .

   OK

   LIN communication system DTC B2785 is not output simultaneously.

   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.

NG → See step   7 

OK: Go to next step 

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. Read the Data List according to the display on the Techstream.
   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 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 sensor signal is off.

   Result

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

B → See step   9 

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.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Positive (+) tester probe → H18-4 (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 will be locked. If the engine switch is then turned on (ACC) or on (IG), the steering 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))

NG → See step   9 

OK: Go to next step 

1. Disconnect the H56 certification ECU (smart key ECU assembly) connector.
2. Disconnect the H18 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
   H56-26 (SLP) - H18-4 (SLP1)	Always	Below 1 Ω
   H56-26 (SLP) or H18-4 (SLP1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8