IGN A fuse is the feed to the ignition switch. So my next step is to see what feed HVAC 1 fuse and try to link that power feed to my other concerns. With this being an intermittent issue testing is going to be tough. Referencing HVAC code B1375, I looked for the ignition 3 feed circuit. So I went for a wire diagram of the blower motor circuit and also the power feeds for the HVAC module. That one statement changes everything because a communication problem has a low chance of bringing down a manual HVAC systems blower motor control. I didn’t start testing in that direction because the customer stated he would lose is blower motor control every time this would happen. From the codes only, I am leaning towards a bad ABS module that is bringing down the communication circuit causing the loss of throttle control but this could also be a power or ground issue.
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