1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,286 Posts
The PCM usually controls powertrain management and has little to do with dashboard functions (except gauges).
There may be fault codes stored in various modules that would help diagnose this.
The module that the others lost communication with would be a key suspect. Especially in the instrument cluster (CCN- cabin compartment node) which has taken over the old BCM (body control module) functions. If you have EVIC, it may pull up some fault codes without a scan tool.
It may be a poor ground in common to these dash, wiper, lights symptoms (all controlled by the CCN).
There may be fault codes stored in various modules that would help diagnose this.
The module that the others lost communication with would be a key suspect. Especially in the instrument cluster (CCN- cabin compartment node) which has taken over the old BCM (body control module) functions. If you have EVIC, it may pull up some fault codes without a scan tool.
It may be a poor ground in common to these dash, wiper, lights symptoms (all controlled by the CCN).