Air Bag Systems
DTC 21 - DRIVER INITIATOR CIRCUIT RESISTANCE HIGHCAUTION:
- When measurements are requested in this chart use specified digital multimeter with correct terminal adapter from special tool (Connector test adapter kit).
- When a check for proper connection is requested refer to "INTERMITTENTS AND POOR CONNECTIONS" in this section.
- When an open in air bag wire harness, damaged wire harness, connector or terminal is found, replace wire harness, connectors and terminals as an assembly.
DTC WILL SET WHEN:
The combined resistance of the driver air bag (inflator) module, contact coil assembly, harness wiring and connector terminal contact is above a specified value for specified time.
DTC CHART TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the diagnostic chart.
1) This test determines whether the malfunction is in the driver air bag (inflator) module circuitry or in the SDM wiring harness circuitry.
2) This test checks whether the malfunction is due to high resistance in CKT "G/R".
3) This test checks whether the malfunction is due to high resistance in CKT "G".
4) This test determines whether the malfunction is in the driver air bag (inflator) module or the contact coil assembly.
DIAGNOSTIC AIDS:
An intermittent condition is likely to be caused by a poor connection at terminals "C1" and "C2" of the contact coil connector at the base of the steering column, terminals "D1" and "D2" of the driver air bag (inflator) module connector in the steering wheel lower cover, SDM terminals "A9" and "Al 0" or a poor wire to terminal connection in CKT "G/R" or CKT "G". The test for this diagnostic trouble code is only run while the "AIR BAG" warning lamp is performing the bulb check, unless DTC 17 or DTC 26 is detected. When a scan tool "Clear Codes" command is issued and the malfunction is still present, the DTC will not reappear until the next ignition cycle.
WIRING DIAGRAM