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 |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - BATTERY)
- Disconnect the 1A and 1C junction block connectors.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
2 CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - GROUND)
- Disconnect the 1K and 1L junction connectors.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
3 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
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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DESCRIPTION
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RH and multiplex
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