Code 21 (Chart 1) - Steering Column Resistance Too High: Description

DERM injects a current of 75 milliamperes through steering column from FORCE HI output (terminal A4) to FORCE LOW input (terminal A10). By monitoring voltage at SENSE HIGH input (terminal A7) and SENSE LOW input (terminal A6), DERM calculates combined resistance of inflator module, SIR coil, harness wiring (circuits No. 347, 348 and 349) and terminal contact in steering column.