Dtc B2288 Steering Lock Signal Circuit Malfunction
Lexus IS250 IS220d GSE20 ALE20 2AD-FHV STARTING
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK FOR DTCS
CHECK CONNECTORS
CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)
CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - STEERING LOCK ECU)
INSPECT POWER SOURCE CONTROL ECU
INSPECT STEERING LOCK ECU
RECHECK FOR DTC
DTC B2288 Steering Lock Signal Circuit Malfunction
DESCRIPTION
This DTC is output when the power source control ECU cannot detect the unlock condition of the steering lock within a specified time.
- When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.
| DTC No. | DTC Detection Condition | Trouble Area |
| B2288 |
After turning engine switch from off to on (IG), the steering wheel does not unlock for a certain period of time (ECU unlocks steering wheel only when it receives an unlock signal from LIN communication and cable) |
Power source control ECU
Steering lock ECU
Wire harness or connector
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Check for DTCs again.
- OK:
- DTC B2785, DTC B2287 and DTC B2781 are not output.
If DTC B2785 is output .
If DTC B2287 is output .
If DTC B2781 is output .
Check that the connectors are securely connected and the terminals are not deformed or loose.
- OK:
- The connectors are securely connected and the terminals are not deformed or loose.
| | REPAIR OR REPLACE CONNECTORS |
|
|
| 3.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND) |
Disconnect the J55 ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection (Symbols) | Condition | Specified Condition |
| J55-6 (GND2) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - STEERING LOCK ECU) |
Disconnect the J29 ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J55-26 (SLP) - J29-4 (SLP1) | Always | Below 1 Ω |
| J55-32 (SLR+) - J29-3 (IGE) | Always | Below 1 Ω |
| J55-30 (LIN1) - J29-5 (LIN) | Always | Below 1 Ω |
| J29-2 (SGND) - Body ground | Always | Below 1 Ω |
| J29-1 (GND) - Body ground | Always | Below 1 Ω |
| J55-26 (SLP) or J29-4 (SLP1) - Body ground | Always | 10 kΩ or higher |
| J55-32 (SLR+) or J29-3 (IGE) - Body ground | Always | 10 kΩ or higher |
| J55-30 (LIN1) or J29-5 (LIN) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 5.INSPECT POWER SOURCE CONTROL ECU |
Reconnect the J55 ECU connector.
Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.
| Item | Contents |
| Terminal (Symbols) | J55-26 (SLP) - Body ground |
| Equipment Setting | 2 V/DIV., 100 ms./DIV. |
| Condition | Engine switch on (IG) |
- OK:
- The waveform appears as shown in the illustration.
| | REPLACE POWER SOURCE CONTROL ECU |
|
|
| 6.INSPECT STEERING LOCK ECU |
Reconnect the J29 ECU connector.
Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.
| Item | Contents |
| Terminal (Symbols) | J55-26 (SLP) - Body ground |
| Equipment Setting | 2 V/DIV., 100 ms./DIV. |
| Condition | Steering is LOCK / UNLOCK |
- OK:
- The waveform appears as shown in the illustration.
| | REPLACE STEERING LOCK ECU |
|
|
After DTCs are all cleared, check if the trouble occurs again 30 seconds after the engine switch is turned on (IG) and clutch pedal depressed.
- OK:
- DTC B2288 is not output.
| | REPLACE POWER SOURCE CONTROL ECU |
|
|
| OK | |
| |
| REPLACE STEERING LOCK ECU |
|
LEXUS IS250, IS220d / GSE20 ALE20
