Normal Operation

The driver seat track position sensor is comprised of integrated circuits called a Hall-effect switch. The seat track position sensor indicates to the Restraints Control Module (RCM) the position of the driver seat, forward or rearward.

The RCM  supplies current to the seat track position sensor. Current flows through the switch, both in the forward or rearward seat position to ground. The RCM  will sense the difference in this current draw, 3 mA (forward) or 8 mA (rearward), and use this information in determining the deployment rate of the dual-stage driver air bag module.

If the RCM  detects a short to ground, it will store DTC C1947 in memory and send a message to the Instrument Cluster (IC) module to flash Lamp Fault Code (LFC) 49 on the air bag warning indicator. After the LFCs  are displayed, the air bag warning indicator will remain illuminated for the rest of the ignition cycle.

• DTC C1947 (Front Driver's Seat Track Position Switch Circuit Short to Ground) - If the RCM  detects a short to ground on the driver seat track position sensor circuit for greater than 2.5 seconds, it will set this DTC.

  This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Driver seat track position sensor
• RCM