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10B-28 Body Electrical Control System:
Troubleshooting
Step
1
Check DTC in BCM
Is DTC U1100 (No. 1100) and DTC U1073 (No. 1073)
detected together?
2
Check DTC in ECM
1) Check ECM for DTC.
Is DTC P1678 detected?
3
Check each control module connectors
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck BCM for DTC.
Is DTC U1100 (No. 1100) detected?
4
CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between control
modules for open, short and high resistance.
Is each CAN communication circuit in good condition?
5
Check DTC in TCM
1) Connect connectors to all control modules.
2) Check TCM for DTC.
Is DTC P1777 detected?
Action
Yes
Go to "DTC U1073 (No.
1073): Control Module
Communication Bus
Off: ".
Go to "DTC P1674:
CAN Communication
(Bus Off Error): in
Section 1A".
Go to Step 4.
Go to Step 5.
Check ECM power and
ground circuit. If circuit
is OK, substitute a
known-good ECM and
recheck.
No
Go to Step 2.
Go to Step 3.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
Repair circuit.
Substitute a known-
good BCM (included in
junction block assembly
and recheck.
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