DTC 18

"idDiagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

During the "Initiator Assembly Resistance Test" the DERM grounds the "Driver Side Low" terminal "B8" and measures the voltage at "Driver Side Low" and "Passenger Side Low." The DERM then grounds "Passenger Side Low" terminal "B7" and again measures the voltage at "Driver Side Low" and "Passenger Side Low." For a properly operating circuit the voltage measurements during each of these tests will be below a specified value. When the voltage measured at either "Driver Side Low" or "Passenger Side Low," but not both, is above a specified value during either test DTC 18 is set.

TEST CONDITIONS
Tested during the "Initiator Assembly Resistance Test" and the "10 Minute Loop Test" when: 1) No "higher priority faults" are detected during "Turn-ON," 2) No "higher priority faults" are detected during "Continuous Monitoring" for one second, 3) No "CRANK" signal present, 4) "Ignition 1" voltage is above a specified value.

FAILURE CONDITIONS
DTC 18 will set when the voltage measured at either "Driver Side Low" or "Passenger Side Low," but not both, is above a specified value while the DERM attempts to ground either of these terminals.

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

CONDITIONS TO CLEAR
DTC 18 will clear when the voltages measured at both "Driver Side Low" and "Passenger Side Low" are below specified value while the DERM grounds each of the terminals.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks whether the malfunction is in the wiring harness. The wiring harness malfunction would be a high resistance rather than an open. An open would set a different diagnostic trouble code.
2. This test determines whether the malfunction is in the wiring harness or in the DERM. The wiring harness malfunction would be a high resistance rather than an open. An open would set a different diagnostic trouble code.