Chime Warning

There are six audible warning tones and four warning lights that the GEM controls. The GEM performs a prove out on all warning light miniature bulbs (13466) (except the seat belt, 4x4 and door ajar) by turning on the miniature bulb for two seconds after the ignition switch is turned to RUN from START. The warning chimes and lamps are described below.

Tone Request

A single tone will be provided each time a ground signal is received from the message center. A one-second tone will sound for warning indications from the message center. A 100-millisecond tone will sound for each message center button depressed.

Headlamp On Warning

A chime sounds when the exterior lamps are on (parking, license plate and headlamps (13008) ) and:

There is no key in the ignition switch 20 seconds after ignition is turned off.
The driver's front door (20124) is ajar (or open).
Vehicle speed is below 24 km/h (15 mph).
Door Ajar Warning

When at least one door is ajar and the key is in the RUN position, the door ajar cluster lamp is activated and remains on until all doors are closed. A warning tone will sound once any time the key is in the ignition switch and any door is open. The GEM's flexibility allows customizing of different warnings (i.e., a steady tone for a driver's door ajar).

Driver Seat Belt Warning

If the driver's seat belt is unbuckled when the ignition switch is placed in RUN, a chime sounds for 6 seconds (or until the driver's seat belt is buckled) and a warning light is turned on for 61 seconds (or until the driver's seat belt is buckled).

Key In Ignition

Any time the key is in the ignition switch and the driver's door is open, the module sounds a chime (120 chimes per minute) until either the key is removed from the ignition or the driver's door is closed.

Battery Saver

NOTE: The exterior lamps are not part of the battery saver protection, and will remain on even if the GEM turns the interior lamps off.

The battery saver feature removes extended interior lamp power drains to the battery (10655) . The GEM keeps power to these loads for 40 minutes after the ignition switch is moved to OFF.

The GEM will keep power available for all interior lights, key ring lights, cargo lamp, and hood lamp circuits for 40 minutes after the ignition switch is turned off. The battery saver timer is reset by lifting a door handle (receiving an illuminated entry request), activating a door ajar switch, changing the ignition to START, or moving the key to the RUN or ACCY position. No lamp or chime indication is provided.

A WAKE-UP command is sent when:

any door becomes ajar or is opened or closed.
the front door handle is lifted (if equipped with illuminated entry).
the key is inserted or removed.
the ignition switch is turned from OFF to RUN.
the ignition switch is turned from OFF to ACCY.
a wake up request is received from the RAP module.
Courtesy Lamps

The GEM illuminates the interior courtesy lamps when any door is set ajar or is opened. The following are inputs used for controlling the courtesy lamps:

All door ajar switches (including liftgate)
Door handle switches
Illuminated entry request with RAP module
Two-step unlock door disarm switches.
All interior courtesy lamps are turned off when any of the following occurs:

25 seconds have elapsed after all the doors are closed.
The ignition switch is turned to RUN.
Vehicle speed is over 8 km/h (5 mph).
A power door lock command is received before the five seconds have elapsed.
Illuminated Entry

The interior courtesy lamps will be turned on if any front door handle is lifted or if any door is ajar. If the lamps are turned on by lifting the front door handle or by illuminated entry request, the lamps stay on for 25 seconds.

The interior courtesy lamps are turned off when the ignition switch is turned to RUN.

Delayed Accessory

The module provides temporary power to the power windows, the rear wiper (for parking of the rear wiper off the liftgate glass), the power moon roof, and the message center for ten minutes after the ignition switch is moved from the RUN to OFF position. If during this ten-minute period either front door is opened, the delayed accessory relay will be de-energized. If either door is opened during a one-touch operation, the module will wait until the one-touch operation is completed before de-energizing the delayed accessory relay.

One-Touch Window

When the power switch for driver's window control is held down (between 0.04 and 0.4 second) and then released with the ignition switch in RUN or ACC, the driver's window will automatically move to its full down position.

Only the driver's window has this feature. Holding the driver's switch down longer allows the operator to stop the window as soon as the switch is released.

The one-touch window feature can be enabled or disabled by the operator.

Close both front doors .
Key ON.
Key OFF.
Remove key from ignition switch .
Press and hold the down window switch to enable/disable the one-touch window feature.
Reinsert the key into the ignition switch within two seconds after pressing the down window switch.
Continue to hold the switch until a two-second tone is heard.
Release the switch while the tone is active.
After the two-second tone, the following confirmation beep sequences will be heard:
One beep — feature disabled.
Two beeps — feature enabled.
Repeat the procedure again to toggle back and forth.

Two-Step Unlock

Upon receiving a two-step unlock command, the GEM illuminates the courtesy lamps. There is a five-second window that begins from the first transition of the unlock switch. If within that window, a second unlock command is sensed by the GEM, the GEM will energize a relay to unlock all the doors.

Four-Wheel Drive Electronic Shift-on-the-Fly (Ranger)

This feature electronically shifts the vehicle transfer case between 2WD, 4WD, and 4WD LOW. The system mode is selected by the operator through a three-position rotary switch on the instrument panel. The operator is informed which mode the system is in by two cluster indicator lamps, one for 4WD HIGH, and one for 4WD LOW (in 4WD LOW, both lamps are on). The GEM accomplishes shifts between different system modes by interpreting inputs from 4x4 selector switch, the vehicle speed signal, and the transfer case contract plates. Based on these inputs, two relays (L2H and H2L directional control), the transfer case motor, and an output for the transfer case electric clutch, are used to shift into 2WD, 4WD HIGH, or 4WD LOW. The GEM will not allow shifts into 4WD LOW unless the brake is depressed, the vehicle is in NEUTRAL (with automatic transmission vehicles), the clutch is pressed (in manual transmission vehicles), and the speed is less than 5 km/h (3 mph).

Control Trac

This feature electronically shifts the vehicle transfer case between 2WD, automatic 4WD, and 4WD LOW. The system mode is selected by the operator through a three-position rotary switch on the instrument panel. The operator is informed which mode the system is in by two cluster indicator lamps, one for A4WD and one for 4WD LOW. The GEM accomplishes shifts between different system modes by interpreting inputs from the 4x4 selector switch, vehicle speed signal, transfer case rear and front shaft Hall effect speed sensors, and the transfer case contact plates. Based on these inputs, the shifts are controlled through two outputs to the center axle engage and disengage solenoids, two relays (L2H and H2L directional control) to control the transfer case shift motor, and an output for the transfer case electric clutch. While in the automatic four-wheel drive mode, the electric clutch engagement is automatically controlled based on front and rear shaft speed differences (wheel slippage), transferring increased traction to the front wheels. The electric clutch is fully engaged when in the 4WD LOW mode.

A transfer case NEUTRAL capability is also available for vehicle towing needs. This feature will be available and programmed at the dealership. The transfer case can be put in NEUTRAL by placing the transmission in NEUTRAL, the key in the OFF position, and the speed is 0 km/h (0 mph). The transfer case will automatically be shifted out of NEUTRAL if the vehicle ignition switch is moved to RUN or ACCY, or the transmission is moved out of NEUTRAL.