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