DTC 33

CIRCUIT DESCRIPTION
At "Turn-ON" the DERM monitors the voltage at the "36 VLR" output, terminal "A2," before this circuit begins to charge. If the diode in the arming sensor connected to terminal "B" is shorted, "Ignition 1" voltage will be present at the "36 VLR" output, terminal "A2," as soon as the ignition is turned "ON." If the DERM detects voltage for three ignition cycles in a row, History DTC 33 will be set.

TEST CONDITIONS
Tested once during each ignition cycle at "Turn-ON."

FAILURE CONDITIONS
History DTC 33 will set if voltage at the "36 VLR" output of the DERM, terminal "A2," is detected within the first 500 milliseconds after the ignition is turned "ON," three ignition cycles in a row.

ACTION TAKEN
DERM stores a History DTC 33.

CONDITIONS TO CLEAR
History DTC 33 will remain stored in EEPROM until DTCs are cleared with a scan tool. After DTCs are cleared, the ignition must be "OFF" long enough to ensure the "36 VLR" supply voltage has fully discharged (10 minutes). Once the "36 VLR" is discharged, the DERM will again check the failure conditions upon ignition "ON." If the failure conditions are not present (no failure indicated) then, and only then, will history DTC 33 be cleared.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks whether the DTC was set by short ignition cycles.
2. This test determines whether a DTC 33 condition does exist.
3. This test determines whether the malfunction is a short to B+ on the "36 VLR" circuit or a shorted diode.