R081

CIRCUIT DESCRIPTION
During the "Turn-ON" tests, performed at the beginning of each ignition cycle, the DERM delays the charging of the "Driver 36 VLR" and "Passenger 36 VLR" power supplies. While the delay is active the DERM measures the
voltage at the "Driver 36 VLR" terminal "A4", "Passenger 36 VLR" terminal "A3", "Driver Source Sense" terminal "A5", and "Passenger Source Sense" terminal "A6". When the voltage measured at the two "36 VLR" power supplies indicates they are in a discharged state, the voltage measured at "Passenger Source Sense" is within a specified range of "Ignition 1" voltage and the voltage measured at "Driver Source Sense" is a specified amount below "Ignition 1" voltage DTC RO81 is set.

DTC WILL SET WHEN
With both "36 VLR" power supplies in a discharged state, the DERM detects "Ignition 1" voltage at "Passenger Source Sense" terminal "A6" while simultaneously the DERM does not detect "Ignition 1" voltage at "Driver Source Sense" terminal "A5". This test is run once each ignition cycle during the "Turn-ON" tests while the "36 VLR Delay" is active.

ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets a diagnostic trouble code.

DTC WILL CLEAR WHEN
With both "36 VLR" power supplies in a discharged state, the voltages measured at "Driver Source Sense" terminal "A5" and "Passenger Source Sense" terminal "A6" are simultaneously within a specified range of "Ignition 1" voltage. When neither the failure nor clear conditions are met, the state of the DTC from the previous ignition cycle is used.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks for a short from the "Driver Source Sense" circuit to the "Passenger 36 VLR" circuit.
2. This test checks for a short from the "Driver Source Sense" circuit to the "Driver 36 VLR" circuit.
3. This test determines whether the malfunction is due to an open within the dual pole arming sensor.

DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a short between CKT 1400 and CKT 236, a short between CKT 1400 and CKT 1401, or a malfunctioning dual pole arming sensor. The test for this diagnostic trouble code is only run while the "AIR BAG" warning lamp is performing the bulb check. When a scan tool "Clear Codes" command is issued and the malfunction is still present, the DTC will not reappear until the ignition switch is turned "OFF" for at least two minutes with the entire SIR system connected and then the ignition switch is turned "ON."