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Bus Failure
The CCD data bus, it is possible for the data bus to pass all tests since the voltage parameters will be in “range“ and false signals are being sent. There are essentially 12 “hard failures“ that can occur with the CCD data bus:
■Bus Shorted to Battery
■Bus Shorted to 5 Volts
■Bus Shorted to Ground
■Bus (+) Shorted to Bus (–)
■Bus (–) and Bus (+) Open
■Bus (+) Open
■Bus (–) Open
■No Bus Bias
■Bus Bias Level Too High
■Bus Bias Level Too Low
■No Bus Termination
■Not Receiving Bus Messages Correctly
The following visible symptoms or customer complaints, alone or in combination, may indicate a CCD data bus failure:
Airbag Indicator Lamp and Malfuntion Indicator Lamp (MIL) Illuminated
Instrument Cluster Gauges (All) Inoperative or no bus message
No Compass Mini-Trip Computer (CMTC) Operation