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DTC U1073 (No. 1073): Control Module Communication Bus Off
Wiring Diagram
[A]: BCM connector (viewed from harness side)
[B]: ECM connector (viewed from harness side)
[C]: Combination meter connector (viewed from
harness side)
DTC Detecting Condition and Trouble Area
DTC detecting condition
Transmission error that is inconsistent between
transmission data and transmission monitor (CAN bus
monitor) data is detected more than 7 times continuously.
(1 driving detection logic)
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 and pending DTC.
[D]: TCM connector (equipped with A/T) (viewed
from harness side)
1. BCM
2. Junction block assembly
• CAN circuit
• Combination meter
• BCM
• TCM
• ECM
Body Electrical Control System:
3. ECM
4. TCM (equipped with A/T)
5. Combination meter
Trouble area
10B-25
S4RS0AA204025
I4RS0AA20014-
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