DTC B1213 Tilt and Telescopic ECU Communication Stop

DESCRIPTION

This DTC is detected when communication between the tilt and telescopic ECU and the gateway ECU stops for more than 10 seconds.

DTC No.	DTC Detection Condition	Trouble Area
B1213	Tilt and telescopic ECU communication stops	Tilt and telescopic ECU Wire harness

Dtc B1213 Tilt And Telescopic Ecu Communication Stop. MULTIPLEX COMMUNICATION. Lexus IS250 IS220d GSE20 ALE20

When "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1213, repair the "+B or GND short malfunction of communication bus" DTCs first.

1.INSPECT FUSE (TI & TE, MPX-B)

Remove the TI & TE fuse from the main body ECU RH (cowl side J/B RH).

Remove the MPX-B fuse from the engine room J/B No. 1.

Measure the resistance of the fuses.

REPLACE FUSE

OK

2.CHECK WIRE HARNESS (TILT AND TELESCOPIC ECU - BATTERY AND BODY GROUND)

Disconnect the J28 ECU connector.

Measure the resistance and voltage of the wire harness side connector.

Standard voltage:
Tester Connection Condition Specified Condition
+B (J28-2) - Body ground Always 10 to 14 V
ECUB (J28-9) - Body ground Always 10 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK RESISTANCE OF COMMUNICATION LINE

Disconnect the J28 and RA ECU connectors.

Dtc B1213 Tilt And Telescopic Ecu Communication Stop. MULTIPLEX COMMUNICATION. Lexus IS250 IS220d GSE20 ALE20

Measure the resistance between the specified terminals on the wire harness side connectors.

Standard resistance:
Tester Connection Specified Condition
MPX1 (J28-5) - RA-20 Below 1 Ω
MPX1 (J28-5) - Body ground 10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE TILT AND TELESCOPIC ECU

Tester Connection	Specified Condition
GND (J28-11) - Body ground	Below 1 Ω