DTC B2285: Steering Lock Position Signal Circuit Malfunction; DTC B2288: Steering Lock Signal Circuit Malfunction: Procedure

1. Use the Data List to check if the steering lock is functioning properly.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Steering Unlock Switch	Steering lock condition/ON or OFF	ON: Steering unlocked OFF: Steering locked	-

   RESULT
   
   

   Result	Proceed to
   Display on the Techstream does not change according to steering lock position	A
   Display on the Techstream changes according to steering lock position	B

B → REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) 

A: Go to next step 

Fig 1: Identifying Main Body ECU Connector And Steering Lock ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E1 main body ECU connector.
2. Disconnect the E26 steering lock ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E1-18 (SLP) - E26-4 (SLP1)	Always	Below 1 Ω
   E1-18 (SLP) or E26-4 (SLP1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the main body ECU with a new or normally functioning one.
2. Check whether DTC B2285 and B2288 are output.

   OK

   No DTC is output.

NG → See step   4 

OK → END