Lexus IS250 · Service Manual COMMUNICATION SYSTEM

B1210

Diagnostic trouble codes

DESCRIPTION

HINT:
This DTC is only output on vehicles equipped with an entry and start system.

  1. 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
  1. Power source control ECU
  2. Wire harness

WIRING DIAGRAM

B110894E01

INSPECTION PROCEDURE


1. INSPECT FUSE (AM2)

  1. Remove the AM2 fuse from the main body ECU (cowl side J/B RH).

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω



 NG
REPLACE FUSE
OK


2. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)

  1. B109192E09
    Disconnect the J55 ECU connector.

  1. 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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. CHECK RESISTANCE OF COMMUNICATION LINE

  1. B110956E02
    Disconnect the J55, J26 and 2F ECU connectors.

  1. 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



B
REPLACE POWER SOURCE CONTROL ECU AND REPAIR OR REPLACE HARNESS OR CONNECTOR

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE POWER SOURCE CONTROL ECU


← B1209B1213 →