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Last Modified: 11-27-2007 1.6 C
Service Category: Vehicle Interior Section: Theft Deterrent/Keyless Entry
Model Year: 2008 Model: LX570 Doc ID: RM000000YD302TX
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function): DESCRIPTION (2008 LX570)

DTC

B2285

Steering Lock Position Signal Circuit Malfunction

DTC

B2288

Steering Lock Signal Circuit Malfunction

DESCRIPTION

The main body ECU and the steering lock ECU are connected by a cable and the LIN communication line. These DTCs are stored when: 1) signals, transmitted through the cable and the communication line, do not match; or 2) a malfunction is detected in the circuit between the main body ECU and the steering lock ECU.

DTC Code

Detection Condition

Trouble Area

B2285

The cable and LIN information between the main body ECU and steering lock ECU is inconsistent.
  • Main body ECU
  • Steering lock actuator assembly (steering lock ECU)
  • Harness or connector

B2288

After turning the engine switch from off to on (IG), the steering wheel does not unlock for a certain period of time (the ECU unlocks the steering wheel only when it receives an unlock signal through LIN communication and the cable).
  • Main body ECU
  • Steering lock actuator assembly (steering lock ECU)
  • Harness or connector

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING TECHSTREAM (STEERING UNLOCK SWITCH)

(a) 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
A

2.

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


(a) Disconnect the E1 main body ECU connector.

(b) Disconnect the E26 steering lock ECU connector.

(c) 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
OK

3.

REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

(a) Temporarily replace the main body ECU with a new or normally functioning one.

(b) Check whether DTC B2285 and B2288 are output.

OK:

No DTC is output.

OK