Ford F150 Pickup. Manual - part 315

Fig. 28: Installing Key Release Button 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 STEERING Steering Column Switches - F150 Pickup

  

2003 ACCESSORIES AND EQUIPMENT

Warning Devices - F150 Pickup 

DESCRIPTION AND OPERATION 

WARNING DEVICES 

The warning device system consists of the following: 

z

key-in-ignition warning switch  

z

door open warning lamp switch  

DIAGNOSIS AND TESTING 

GAUGES AND WARNING DEVICES - GEM/CTM 

Refer to WARNING SYSTEMS and INSTRUMENT CLUSTER for schematic and connector information. 

Special Tool(s) 

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Warning Devices - F150 Pickup

  

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Warning Devices - F150 Pickup

  

Fig. 1: Identifying Special Tool(s) For Gauges And Warning Devices - GEM/CTM 
Courtesy of FORD MOTOR CO. 

z

central timer module (CTM)  

z

generic electronic module (GEM)  

z

driver safety belt switch (integral to the safety belt buckle)  

GEM/CTM Input/Output Description 

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Warning Devices - F150 Pickup

  

Fig. 2: GEM/CTM Input/Output Circuit 
Courtesy of FORD MOTOR CO. 

Principles of Operation 

The generic electronic module (GEM) and central timer module (CTM) control the following warnings and 
chimes: 

z

driver safety belt not fastened (warning lamp and repetitive chime)  

z

key-in-ignition warning (repetitive chime)  

z

headlamp-on warning (repetitive chime)  

z

door ajar (warning lamp and single tone)  

z

air bag redundant (repetitive chime)  

The following five distinct chime rates are used to indicate warning:

 

2003 Ford Pickup F150 

2003 ACCESSORIES AND EQUIPMENT Warning Devices - F150 Pickup