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Toyota Sienna Service Manual: 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

  1. Disconnect the 1A and 1C junction block connectors.
  2. 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

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

Standard resistance

Standard resistance

3 CHECK COMMUNICATION LINE

CHECK COMMUNICATION LINE

  1. Disconnect the A21, G4 and B7 ECU connectors.
  2. 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 ...

Passenger Side Outer Mirror ECU
DTC B1208 Passenger Side Outer Mirror ECU DESCRIPTION This DTC is detected when communication between the outer mirror control ECU RH and multiplex network gateway ECU stops for more than 10 seco ...

Other materials:

Television camera
COMPONENTS REMOVAL 1. REMOVE BACK DOOR GARNISH CENTER HINT:  Back Door:  Power Back Door: 2. REMOVE BACK DOOR SIDE GARNISH LH HINT:  Back Door:  Power Back Door: 3. REMOVE BACK DOOR SIDE GARNISH RH  Back Door:  Power Back Door: ...

Installation
1. INSTALL POWER POINT SOCKET ASSEMBLY  Engage the 2 claws to install the power point socket assembly. 2. INSTALL QUARTER TRIM FRONT PANEL ASSEMBLY LH 3. INSTALL BACK DOOR SCUFF PLATE 4. INSTALL BACK DOOR WEATHERSTRIP 5. INSTALL REAR DOOR WEATHERSTRIP LH 6. INSTALL REAR DOOR S ...

Problem symptoms table
Use the table below to find the cause of the problem. The numbers indicate the priority of the likely cause of the problem. Check each part in order. If necessary, replace these parts. Front A/C: Rear A/C: ...

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