B3656

DTC B3656

CIRCUIT DESCRIPTION
The auxiliary power outlet (APO) switch controls the operation of the hybrid control module (HCM) APO state manager. The APO state manager commands one of 3 states from the starter generator control module (SGCM) (APO Off, APO Normal, APO Continuous). The APO switch is a momentary button, its output signal an input to an HCM analogue channel. Five volts are supplied to the switch; the returned voltage is measured relative to HCM signal ground to determine the switch state. A resistor network in the switch circuitry ensures that shorted high and low states can be diagnosed successfully. There are 2 valid voltage ranges of the return signal, one representing switch open, the other representing switch closed. If the voltage is lower than a threshold, a short low is indicated. Similarly, if the voltage is greater than the short high threshold, a short 'high' is indicated.

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- The APO switch is requested ON.

CONDITIONS FOR SETTING THE DTC
- If voltage is lower than a calibrated value, a short low is indicated.
- If the voltage is greater than a calibrated value the short high is indicated.
- This DTC is run every 100 milliseconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
- The driver information center (DIC), if equipped, may display a message.

CONDITIONS FOR CLEARING THE DTC
- The Conditions for Setting the DTC are no longer present.
- A history DTC will clear after 40 malfunction-free ignition cycles.
- The HCM receives the clear code command from the scan tool.

TEST

Steps 1-4:

Steps 5-10: