Toyota CH-R Service Manual: Steering Lock Position Signal Circuit Malfunction (B2285)

Toyota CH-R Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / Steering Lock Position Signal Circuit Malfunction (B2285)

DESCRIPTION

This DTC is stored when the steering lock position signal sent by the steering lock ECU (steering lock actuator or upper bracket assembly) via direct line and the steering lock position signal sent via LIN communication do not match.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B2285	Steering Lock Position Signal Circuit Malfunction	The steering lock position signal sent by the steering lock ECU (steering lock actuator or upper bracket assembly) via direct line and the steering lock position signal sent via LIN communication do not match. (1-trip detection logic*)	AM2 fuse Steering lock ECU (steering lock actuator or upper bracket assembly) Certification ECU (smart key ECU assembly) Wire harness or connector	Disconnect the cable from the negative (-) battery terminal, wait 30 seconds and then reconnect the cable to the negative (-) battery terminal. Wait at least 40 seconds with the engine switch off (with the steering locked), then turn the engine switch on (IG) (steering unlocked) and wait at least 40 seconds.

*: Only detected while a malfunction is present and the engine switch is on (IG).

Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected	Fail-safe Function when Malfunction Detected
The engine cannot be started.	The ECU does not send an engine start request.

Related Data List and Active Test Items

DTC No.	Data List and Active Test
B2285	Power Source Control Steering Unlock Switch Smart Key Power Supply Short Motor Driver Short Lock Bar Stuck Error

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.
Click here
Inspect the fuses of circuits related to this system before performing the following procedure.
Before replacing the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or upper bracket assembly), refer to the smart key system (for Start Function) Precaution.
Click here
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

HINT:

When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes

HINT:

If the steering cannot be unlocked, the engine switch cannot be turned on (IG) and the engine cannot be started.
If the LIN communication system is malfunctioning, the steering cannot be locked or unlocked.

OK:

LIN communication system DTC B2785 is not output.

GO TO DTC B2785

2.	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) Read the Data List according to the display on the Techstream.

Body Electrical > Power Source Control > Data List

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

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Steering Unlock Switch

State of steering unlock sensor signal output from steering lock ECU (steering lock actuator or upper bracket assembly)

OFF or ON

OFF: Steering locked

ON: Steering unlocked

When the shift lever is in P and the engine switch is off, if any door is opened or 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 signal is off.

Body Electrical > Power Source Control > Data List

Tester Display
Steering Unlock Switch

Result	Proceed to
Techstream display does not change	A
Techstream display changes	B

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

3.	CHECK HARNESS AND CONNECTOR (POWER SOURCE)

Click here

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

4.	CHECK HARNESS AND CONNECTOR (GROUND)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

(a) Reconnect the F1 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F78-4 (SLP1) - Body ground

Positive (+) tester probe → F78-4 (SLP1)

Negative (-) tester probe → Body ground

Steering locked → unlocked*

10 kΩ or higher → Below 1 Ω

HINT:

*: If any of the doors are opened with the shift lever in P and the engine switch off, the steering will be locked. If the engine switch is turned on (ACC) or on (IG) with the electrical key transmitter sub-assembly in the cabin, the steering will be unlocked.
DTC B2285 may be stored due to a malfunction in the steering lock ECU (steering lock actuator or upper bracket assembly). The steering lock position signal and unlock position signal are sent from the steering lock ECU (steering lock actuator or upper bracket assembly) to the certification ECU (smart key ECU assembly) individually.

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

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

6.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

(a) Disconnect the F1 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the F78 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F1-14 (SLP) - F78-4 (SLP1)	Always	Below 1 Ω
F1-14 (SLP) or F78-4 (SLP1) - Body ground	Always	10 kΩ or higher

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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