(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT
CONTROL ECU)
OK -- Continue to next step.
3. REPLACE POWER MANAGEMENT CONTROL ECU
(a) Replace the power management control ECU See: Power and Ground Distribution/Power Distribution Module/Service and
Repair/Removal.
NEXT -- Continue to next step.
4. CHECK DTC OUTPUT
(a) Clear the DTC See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and Inspection/Reading and
Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs.
OK:
DTC B278C is not output.
NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) See: Accessories and Optional
Equipment/Antitheft and Alarm Systems/Alarm Module/Service and Repair/Removal
OK -- END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)
From 08/2009
NETWORKING: LIN COMMUNICATION SYSTEM: B278C: Lost Communication with Power Source Control
B278C - Lost Communication with Power Source Control
DESCRIPTION
This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and power management control ECU stops
for more than 10 seconds.
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