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10B-30 Body Electrical Control System:
Troubleshooting
Step
1
Check DTC in BCM
Is DTC U1101 (No. 1101) and DTC U1073 (No. 1073)
detected together?
2
Check DTC in TCM
1) Check TCM for DTC.
Is DTC P1774 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 U1101 (No. 1101) 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 ECM
1) Connect connectors to all control modules.
2) Check ECM for DTC.
Is DTC P1676 detected?
Inspection of BCM and its Circuits
BCM and its circuits can be checked at BCM wiring couplers by measuring voltage and resistance.
CAUTION:
BCM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to BCM
with couplers disconnected from it.
Voltage Check
1) Disconnect negative cable (–) at battery.
2) Remove BCM (included in junction block assembly) referring to "BCM (Included in Junction Block Assembly)
Removal and Installation: ".
3) Connect connectors to BCM (1) and junction block assembly (2).
4) Check voltage at each terminal number of couplers connected.
For connector and terminal number, refer to "Connector Layout Diagram of BCM and Junction Block Assembly: ".
Action
Yes
Go to "DTC U1073 (No.
1073): Control Module
Communication Bus
Off: ".
Go to "DTC P1774:
Control Module
Communication Bus
Off: in Section 5A".
Go to Step 4.
Go to Step 5.
Check TCM power and
ground circuit. If circuit
is OK, substitute a
known-good TCM 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.
S4RS0AA204013
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