B1399

Diagnostic Trouble Code Chart:

Wiring Schematic:

CIRCUIT DESCRIPTION
The A/C control assembly receives voltage signals from the heater control module. The signal voltage will vary from 5 volts (open circuit) to 0 volts (short circuit).

CONDITIONS FOR SETTING THE DTC
^ The ignition is ON.
^ The circuit is open or shorted.

ACTION TAKEN WHEN THE DTC SETS
^ Code B1399 is set.
^ The A/C control will not operate.

CONDITIONS FOR CLEARING THE DTC
^ Using a Scan Tool
^ A history DTC will clear when 40 consecutive ignition cycles have occurred without a malfunction.
^ HCM battery voltage is interrupted.
1. Perform the Body Control Module Diagnostic System Check before continuing with the diagnosis of this DTC.
3. Determines if the programmer or A/C control is malfunctioning.
4. Determines whether the programmer is malfunctioning or if there is an open/short in the circuit.