Galant V6-3.8L (6G75) (2005)
CAN-BUS Line Circuit Part 2
CIRCUIT OPERATION
The multi-center display unit (middle grade type) receives information on current A/C operation condition from the A/C-ECU via CAN bus lines.
TECHNICAL DESCRIPTION (COMMENT)
The multi-center display unit (middle grade type) will show "COMMUNICATION ERROR" message if it has received abnormal data from the
A/C-ECU via CAN communication for 60 seconds or more. Then the A/C operation screen, which is based on the last normal information, continues to
be shown. If the communication returns to normal, "COMMUNICATION ERROR" message will disappear and the A/C operation screen will return to
normal.
TROUBLESHOOTING HINTS
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Malfunction of multi-center display unit (middle grade type)
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Malfunction of A/C-ECU
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The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
DIAGNOSIS
Required Special Tools:
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MB991958: Scan Tool (MUT-III Sub Assembly)
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MB991824: Vehicle Communication Interface (V.C.I.)
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MB991827: MUT-III USB Cable
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MB991911: MUT-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Using scan tool MB991958, diagnose the CAN bus line
Use scan tool MB991958 to diagnose the CAN bus lines.