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05-1877
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
05BTA-05
PRE-CHECK
1. MULTIPLEX COMMUNICATION SYSTEM (BEAN)
(a) The BEAN communication line is used to control the airbag sensor assy center (airbag ECU), the En-
gine Control Module (ECM), the air conditioner amplifier (A/C ECU), the combination meter assy, the
multiplex network door ECU rear RH (power slide door ECU RH), the multiplex network door ECU back
(power back door ECU) and the multiplex network door ECU rear LH (power slide door ECU LH). If
there is a short-circuit (bus-down) in the line, the communication to the system that has a short-circuit
(bus-down) will be disabled and the DTC concerning the system will be output from the multiplex net-
work body ECU.
Multiplex Network Body ECU
Airbag Sensor Assy
ECM Combination Meter Assy Multiplex Network Multiplex Network Multiplex Network
Door ECU RH Door ECU back Door ECU LH
Air Conditioner Amplifier
B69734
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2060
05-1878
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
(b) If DTC of ECU communication stop is output, connectors
ECU
may be disconnected, or communication buses may be
open at 2 points. It will not become abnormal with only 1
ECU communication bus open.
ECU
Disconnection (DTC is detected)
ECU
ECU
Open
Open
ECU
Open (DTC is detected)
ECU
ECU
ECU
I03343
I03344
I03345
Open (DTC is not detected) I03977
Example
(c) If 2 communication buses are open at the position as
shown in the illustration, DTC of ECU communication stop
between those 2 buses is output.
Gateway ECU
Open
Open
Detect the DTC of communica-
tion stop of the 3 ECUs.
I03346
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2061
05-1879
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
2. CHECK COMMUNICATION FUNCTION
(a) Check the battery voltage.
Standard: 10 to 14 V
(b) Inspect the DTC output.
(1) Check a DTC concerning the multiplex network body ECU by connecting the hand-held tester
to the DLC3 and turning the ignition switch ON.
HINT:
S When DTC check is impossible, check the following items.
S The display shows communication error (refer to new diagnosis system and the operations when an
error occurred).
(2) When the display shows DTCs concerning the ECU unconnected and the communication bus
defective, perform the inspection depending on the troubleshooting procedures.
HINT:
When another DTC is output, refer to the DTC table and check the applicable section.
Hand-held Tester 3. Using hand-held tester:
CHECK DTC
(a) Prepare the hand-held tester.
(b) Connect the hand-held tester to DLC3.
(c) Turn the ignition switch ON and push the hand-held tes-
ter main switch ON.
(d) Use the hand-held tester to check the DTCs, note them
DLC3 down (For opening instructions, see the hand-held tes-
B69596 ter 's instruction book.).
(e) See page 05-1880 to confirm the details of the DTCs.
4. CLEAR DTC
(a) DTC will be cleared when the malfunction output to DTC
is recovered normally.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2062
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