Ascender 4WD V8-5.3L (2004)
IMPORTANT: Refer to SIR Service Precautions before disabling the SIR system.
The SIR system has been divided into Disabling and Enabling Zones. When performing service on or near SIR components or SIR wiring, it may be
necessary to disable the SIR components in that zone.
It may be necessary to disable more than one zone depending on the location of other SIR components and the area being serviced, refer to SIR Zone
Identification Views. Refer to the illustration, to identify the specific zone or zones in which service will be performed. After identifying the zone or
zones. proceed to the disabling and enabling procedures for that particular zone or zones.
SIR Disabling and Enabling Zone 1
SIR Disabling and Enabling Zone 1
Disabling Procedure
IMPORTANT: Refer to SIR Disabling and Enabling Zones before disabling the SIR system.
1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition.
IMPORTANT: With the AIR BAG fuse removed and the ignition ON, the AIR BAG indicator illuminates. This is normal operation and does
not indicate an SIR system malfunction.
4. Remove the AIR BAG Fuse from the fuse block (1) located in the underhood fuse block.
5. Remove the grille.
6. Remove sensor bracket from bumper.
IMPORTANT: This vehicle is equipped with two inflatable restraint electronic frontal sensors (EFS). When performing this procedure be sure to
include both EFS's.
