Toyota 4Runner: Steering Lock Position Signal Circuit Malfunction (B2285)

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / Steering Lock Position Signal Circuit Malfunction (B2285)

DESCRIPTION

The power management control ECU and steering lock actuator (steering lock ECU) are connected by a cable and the LIN communication line. This DTC is stored when the steering lock position signal information from the cable and the steering lock position signal information from the LIN communication line are inconsistent.

HINT:

When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode is reset to on (IG). When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC Code	DTC Detection Condition	Trouble Area
B2285	The steering lock position signal information from the cable and the steering lock position signal information from the LIN communication line are inconsistent.	AM2 fuse Steering lock actuator assembly (steering lock ECU) Power management control ECU LIN communication system Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
After replacing the steering lock actuator assembly (steering lock ECU), perform key ID code registration (See page ).

PROCEDURE

1.	CHECK FOR DTC (LIN COMMUNICATION SYSTEM)

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

OK:

LIN communication system DTCs B2287 and B2785 are not output simultaneously.

GO TO DTC B2287

2.	CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F68-4 (SLP1) - Body ground	Steering lock locked	10 kΩ or higher
F68-4 (SLP1) - Body ground	Steering lock released	Below 1 Ω

Text in Illustration

*a	Component with harness connected (Steering Lock ECU)

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

5.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - STEERING LOCK ECU)

(a) Disconnect the F80 power management control ECU connector.

(b) Disconnect the F68 steering lock ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F80-3 (SLP) - F68-4 (SLP1)	Always	Below 1 Ω
F80-3 (SLP) or F68-4 (SLP1) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	READ VALUE USING TECHSTREAM (STEERING UNLOCK SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

(e) 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	Steering lock condition / ON or OFF	ON: Steering lock released (Engine switch on [ACC]) OFF: Steering lock locked (Engine switch off)	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Steering Unlock Switch

Steering lock condition / ON or OFF

ON: Steering lock released (Engine switch on [ACC])

OFF: Steering lock locked (Engine switch off)

OK:

ON (steering lock released) or OFF (steering lock locked) appears on the screen according to the steering lock condition.

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

REPLACE POWER MANAGEMENT CONTROL ECU

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