DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT IG2 RELAY
CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND)
CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)
DTC B2788 IG2 Signal Malfunction
DESCRIPTION
The steering lock ECU receives power from the IG2 relay. When the voltage value indicated by the IG signal from the certification ECU equals to the voltage that is applied to the steering lock ECU, the steering will be unlocked. The steering lock ECU will not lock the steering when power from the IG2 relay is present (this prevents the steering from being locked while the vehicle is moving).
| DTC No. | DTC Detecting Condition | Trouble Area |
| B2788 | Different information is obtained from IG2 signals received directly from the IG2 circuit, and from IG2 signals sent via LIN communication for a period of 1 second. | IG2 relay
Wire harness
Power source control ECU
Steering lock actuator assembly (Steering lock ECU)
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Remove the IG2 relay from the engine room R/B No.2.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Specified Condition |
| 3 - 5 | 10 kΩ or higher |
| 3 - 5 | Below 1 Ω
(when battery voltage is applied to terminals 1 and 2) |
| 2.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) |
Disconnect the J29 connector from the steering lock actuator assembly.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection
(Symbols) | Condition | Specified condition |
| J29-1 (GND) - Body ground | Always | Below 1 Ω |
| J29-2 (SGND) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY) |
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester connection
(Symbols) | Condition | Specified condition |
| J29-6 (IG2) - J29-1 (GND) | Engine switch on (IG) | 10 to 14 V |
| J29-6 (IG2) - J29-2 (SGND) | Engine switch on (IG) | 10 to 14 V |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection
(Symbols) | Condition | Specified condition |
| *J29-6 (IG2) - J29-7 (B) | Engine switch off | 10 kΩ or higher |
*: This measurement is performed with the engine switch off to check for a battery voltage short in the IG2 circuit.
| | REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) |
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| NG | |
| |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY) |
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LEXUS IS250, IS220d / GSE20 ALE20
