1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,275 Posts
The column multifunction switch is a MUX input to the BCM (body control module) which buses the information to the IPM (intelligent power module) under the hood for the front turn signals. The rear turn signals are driven directly by the BCM.
The chances of computer failure wouldn't be my first guess. A bad switch or connection would be much more likely. There are no dedicated fuses or flashers.
The modules can store fault codes in order to aid the diagnosis. Don't just replace parts. A wiring diagram and meter will help you follow the wires to the point of failure. You will need to know wire colors and wire routing for tests.
The chances of computer failure wouldn't be my first guess. A bad switch or connection would be much more likely. There are no dedicated fuses or flashers.
The modules can store fault codes in order to aid the diagnosis. Don't just replace parts. A wiring diagram and meter will help you follow the wires to the point of failure. You will need to know wire colors and wire routing for tests.
