DTC    B1209    Driver Side Outer Mirror

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DESCRIPTION

  1. This DTC is detected when communication between the outer mirror control ECU LH (Driver Side Outer Mirror) and multiplex network gateway ECU stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1209
Outer mirror control ECU LH Communication stops
  1. Outer mirror control ECU LH
  2. Wire harness

WIRING DIAGRAM


B110992E02


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 B1209, repair the "+B or GND short malfunction of communication bus" DTCs first.

1.INSPECT FUSE (ECU-B No.1)

  1. Remove the ECU-B No.1 fuse from the fusible link block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω



OK
REPLACE FUSE
NG


2.CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - BATTERY AND BODY GROUND)


    B111038E02

  1. Disconnect the R17 ECU connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Connection
    R17-7 (CPUB) - Body ground
    		10 to 14 V

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Connection
    R17-1 (GND) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK RESISTANCE OF COMMUNICATION LINE

  1. Disconnect the P19 and T4 ECU connectors (w/ Driving position memory).



  1. Disconnect the P19 and G1 ECU connectors (w/o Driving position memory).


    B111050E02

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:

    Tester Connection
    		Specified Condition
    R17-6 (MPX1) - P19-7 (MPX1)
    		Below 1 Ω
    R17-6 (MPX1) - T4-5 (MPX1) (*1)
    		Below 1 Ω
    R17-6 (MPX1) - G1-12 (MPD2) (*2)
    		Below 1 Ω

    *1: w/ Driving Position Memory
    *2: w/o Driving Position Memory



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE OUTER MIRROR CONTROL ECU