10B-29 Body Electrical Control System:
DTC U1101 (No. 1101): Lost communication with TCM
S6JB0AA204015
Wiring Diagram
Refer to “DTC U0155 (No. 0155): Lost Communication with Instrument Panel Cluster (IPC) Control Module”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC.
DTC Troubleshooting
8
DTC check of BCM
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect connector of any one of control module other
than BCM.
3) Recheck BCM for DTC.
Is DTC U1100 (No.1100) detected?
Disconnect connectors
of control modules other
than the one whose
connector is
disconnected in Step 2)
one by one and check
that DTC U1100 is
detected by BCM each
time connector is
disconnected. When
DTC U1100 is not
detected by BCM while
checking in this way, go
to description under
“NO” below. If DTC
U1100 is detected by
BCM even when
connectors of all control
modules that use CAN
communication with
BCM are disconnected,
substitute a known-
good BCM and recheck.
Check power and
ground circuit of control
module disconnected in
Step 2). If circuit is OK,
substitute a known-
good control module
disconnected in Step 2)
and recheck.
Step
Action
Yes
No
DTC detecting condition
Trouble area
BCM can not receive CAN data from TCM for
longer than specified time continuously.
• CAN communication circuit
• BCM
• TCM
Step
Action
Yes
No
1
DTC check of BCM
Is DTC U1101 (No. 1101) and DTC U1073 (No. 1073)
detected together?
Go to “DTC U1073 (No.
1073): Control Module
Communication Bus
Off”.
Go to Step 2.
2
DTC check of TCM
1) Check TCM for DTC.
Is DTC P1774 detected?
Go to “DTC P1774:
CAN Communication
Bus Off in Section 5A”
Go to Step 3.
3
Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck BCM for DTC.
Is DTC U1101 (No. 1101) detected?
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.