Toyota Sienna Service Manual: MPX Body ECU Stop

Toyota Sienna Service Manual / Multiplex communication / System description / Diagnostic trouble code chart / MPX Body ECU Stop

DTC B1200 MPX Body ECU Stop

DESCRIPTION

This DTC is detected when communication between the multiplex network body ECU and the multiplex network gateway ECU stops for more than 10 seconds.

DTC No.	DTC Detection Condition	Trouble Area
B1200	Body ECU communication stops	Multiplex network body ECU Wire harness

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - BATTERY)

CHECK HARNESS AND CONNECTOR

Disconnect the 1A and 1C junction block connectors.
Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

2 CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - GROUND)

CHECK HARNESS AND CONNECTOR

Disconnect the 1K and 1L junction connectors.
Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

3 CHECK COMMUNICATION LINE

CHECK COMMUNICATION LINE

Disconnect the A21, G4 and B7 ECU connectors.
Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

Result

Result

REPLACE MULTIPLEX NETWORK BODY ECU

Diagnostic trouble code chart

If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the chart below (Proceed to the page given for that circuit). MULTIPLEX COMMUNICATION SYSTEM ...

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