Lexus IS250 · Service Manual COMMUNICATION SYSTEM

B1213

Diagnostic trouble codes

DESCRIPTION

  1. 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
  1. Tilt and telescopic ECU
  2. Wire harness

WIRING DIAGRAM

B133424E02

INSPECTION PROCEDURE

HINT:
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)

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

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

  1. Measure the resistance of the fuses.

    Standard resistance:
    Below 1 Ω



 NG
REPLACE FUSE
OK


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

  1. B110957E01
    Disconnect the J28 ECU connector.

  1. 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

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. CHECK RESISTANCE OF COMMUNICATION LINE

  1. Disconnect the J28 and RA ECU connectors.B133216E01

  1. 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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TILT AND TELESCOPIC ECU


← B1210B1214 →