DTC B2285: Steering Lock Position Signal Circuit Malfunction; DTC B2288: Steering Lock Signal Circuit Malfunction [09/2015 - ]: Procedure

CHECK FOR DTC (LIN COMMUNICATION SYSTEM)
1. Check for DTCs (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
  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

NG

GO TO DTC B2785

(Refer to DTC B2785: Communication Malfunction between ECUs Connected by LIN [09/2015 - ] )

Result: OK

OK

See step 2

READ VALUE USING TECHSTREAM (STEERING UNLOCK SWITCH)

Use the Data List to check if the steering unlock switch 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 is unlocked OFF: Steering is locked	-

Result

Result	Proceed to
Data List item does not change	A
Data List item changes (w/ VGRS)	B
Data List item changes (w/o VGRS)	C

Result: B

REPLACE STEERING LOCK ECU

(Refer to DISASSEMBLY [09/2015 - ] )

Result: C

REPLACE STEERING LOCK ECU

(Refer to DISASSEMBLY [09/2015 - ] )

Result: A

See step 3

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the L12 and L13 main body ECU connectors.

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

Standard voltage

Tester Connection	Condition	Specified Condition
L13-6 (AM1) and L12-1 (AM2) - Body ground	Always	11 to 14 V

Result: NG

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

Result: OK

See step 4

CHECK HARNESS AND CONNECTOR (GROUND)

Disconnect the DA main body ECU connector.

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

Standard resistance

Tester Connection	Condition	Specified Condition
DA-40 (GND1) - Body ground	Always	Below 1 Ω

Result: NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result: OK

See step 5

CONFIRM MODEL

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

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - STEERING LOCK ECU)

Disconnect the L13 main body ECU connector.
Disconnect the L33 steering lock ECU connector.

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

Standard resistance

Tester Connection	Condition	Specified Condition
L13-18 (SLP) - L33-4 (SLP1)	Always	Below 1 Ω
L13-18 (SLP) or L33-4 (SLP1) - Body ground	Always	10 kΩ or higher

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

Standard voltage

Tester Connection	Condition	Specified Condition
L13-18 (SLP) or L33-4 (SLP1) - Body ground	Always	Below 1 V

Result: NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result: OK

See step 7

INSPECT STEERING LOCK ECU

Reconnect the L33 steering lock ECU connector.
Reconnect the L13 main body ECU connector.

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

Standard resistance

Tester Connection	Condition	Specified Condition
Positive (+) tester probe → L33-4 (SLP1) Negative (-) tester probe → Body ground	Steering locked*	10 kΩ or higher
	Steering unlocked*	Below 1 Ω

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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. The steering lock position signal and unlock position signal are sent from the steering lock ECU to the main body ECU individually.

Result

Result	Proceed to
OK	A
NG (w/ VGRS)	B
NG (w/o VGRS)	C

Result: A

REPLACE MAIN BODY ECU

Result: B

REPLACE STEERING LOCK ECU

(Refer to DISASSEMBLY [09/2015 - ] )

Result: C

REPLACE STEERING LOCK ECU

(Refer to DISASSEMBLY [09/2015 - ] )

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - STEERING LOCK ECU - DCM)

Disconnect the L13 main body ECU connector.
Disconnect the L33 steering lock ECU connector.
Disconnect the L111 DCM (telematics transceiver) connector.

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

Standard resistance

Tester Connection	Condition	Specified Condition
L13-18 (SLP) - L33-4 (SLP1)	Always	Below 1 Ω
L33-4 (SLP1) - L111-29 (SLPD)	Always	Below 1 Ω
L13-18 (SLP) or L33-4 (SLP1) or L111-29 (SLPD) - Body ground	Always	10 kΩ or higher

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

Standard voltage

Tester Connection	Condition	Specified Condition
L13-18 (SLP) or L33-4 (SLP1) or L111-29 (SLPD) - Body ground	Always	Below 1 V

Result: NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result: OK

See step 9

INSPECT STEERING LOCK ECU

Reconnect the L33 steering lock ECU connector.
Reconnect the L13 main body ECU connector.
Disconnect the L111 DCM (telematics transceiver) connector.

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

Standard resistance

Tester Connection	Condition	Specified Condition
Positive (+) tester probe → L33-4 (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. The steering lock position signal and unlock position signal are sent from the steering lock ECU to the main body ECU individually.

Result

Result	Proceed to
OK	A
NG (w/ VGRS)	B
NG (w/o VGRS)	C

Result: B

REPLACE STEERING LOCK ECU

(Refer to DISASSEMBLY [09/2015 - ] )

Result: C

REPLACE STEERING LOCK ECU

(Refer to DISASSEMBLY [09/2015 - ] )

Result: A

See step 10

INSPECT MAIN BODY ECU
1. Disconnect the L111 DCM (telematics transceiver) connector.
2. Check the push-button start function.
  1. Enter the vehicle while carrying a key.
  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 and main body ECU connectors connected.
Result: OK

OK

REPLACE DCM (TELEMATICS TRANSCEIVER)

Result: NG

NG

REPLACE MAIN BODY ECU