DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT FUSE (AM2)
CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)
CHECK RESISTANCE OF COMMUNICATION LINE
DTC B1210 Power ECU Stop
DESCRIPTION
- This DTC is only output on vehicles equipped with an entry and start system.
This DTC is detected when communication between the power source control ECU and gateway ECU stops for more than 10 seconds.
| DTC No. | DTC Detection Condition | Trouble Area |
| B1210 | Power source control ECU communication stops | Power source control ECU
Wire harness
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Remove the AM2 fuse from the main body ECU (cowl side J/B RH).
Measure the resistance of the fuse.
- Standard resistance:
- Below 1 Ω
| 2.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND) |
Disconnect the J55 ECU connector.
Measure the resistance and voltage of the wire harness side connector.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| J55-33 (AM1) - Body ground | Always | 10 to 14 V |
| J55-12 (AM2) - Body ground | Always | 10 to 14 V |
- Standard resistance:
| Tester Connection | Specified Condition |
| J55-6 (GND2) - Body ground | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK RESISTANCE OF COMMUNICATION LINE |
Disconnect the J55, J26 and 2F ECU connectors.
Measure the resistance between the specified terminals on the wire harness side connectors.
- Standard resistance:
| Tester Connection | Specified Condition |
| MPX1 (J55-7) - MPX2 (J26-7) | Below 1 Ω |
| MPX2 (J55-24) - 2F-5 | Below 1 Ω |
- Result:
| Result | Proceed to |
| Both are OK | A |
| One is OK | B |
| Both are NG | C |
| | REPLACE POWER SOURCE CONTROL ECU AND REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| A | |
| |
| REPLACE POWER SOURCE CONTROL ECU |
|
LEXUS IS250, IS220d / GSE20 ALE20
