Possible Causes

ADDITIONAL CODE(S) PRESENT

FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN

A/C MODE SWITCH MUX CIRCUIT SHORT GROUND

A/C MODE SWITCH MUX CIRCUIT SHORT SENSOR GROUND

A/C MODE SWITCH MUX CIRCUIT OPEN

CONTROL HEAD - MODE SWITCH MUX OPEN/SHORTED TO GROUND

BODY CONTROL MODULE - MODE SWITCH MUX OPEN/SHORTED TO GROUND