Automotive Electrical and Electronic Systems Classroom Manual Fifth Edition Update by John F. Kershaw
Body Accessory Systems Operation 341to the way that the keyless entry system sends andreceives the signals. The transmitter sends thesignal in a different order each time. The transmitterand the remote control door lock receiver(RCDLR) are synchronized to the appropriateorder. If a programmed transmitter is out ofsynchronization, it sends a signal that is not in theorder that the RCDLR expects. This will occurafter 256 presses of any transmitter button that isout of range of the vehicle.Automatic SynchronizationThe keyless entry transmitters do not require amanual synchronization procedure. If needed, thetransmitters automatically resynchronize whenany button on the transmitter is pressed withinrange of the vehicle. The transmitter will operatenormally after the automatic synchronization.DaimlerChrysler KeylessEntry SystemsThe DaimlerChrysler keyless entry system also usesa key fob-style radio transmitter, (Figure 15-39) tounlock and lock the vehicle doors and deck lid. Thismultipurpose system is similar to many aftermarkettheft-deterrent systems, since it turns on the interiorlamps, disarms the factory-installed antitheft system,and chirps the horn whenever it is used.The transmitter attaches to the key ring andhas three buttons for operation within 23 feet(7 meters) of the vehicle module receiver. Thetransmitter has its own code stored in the modulememory. If the transmitter is lost or stolen, or anFigure 15-39. DaimlerChrysler keyless entry systemkey fob-style radio transmitter. (DaimlerChrysler Corporation)additional one is required, a new code must bestored in module memory. Figure 15-40 showsthe integration of the keyless entry, illuminatedentry, vehicle theft security, and power door locksystems with the BCM.THEFT DETERRENTSYSTEMSAntitheft systems are usually aftermarket installations,although in recent years, some manufacturershave offered factory-installed systems onthe luxury vehicles in their model line. Basicantitheft systems provide a warning when aforced entry is attempted through the car doors orthe trunk lid. A starter interlock feature is incorporatedon some models.System functioning relies on strategicallylocated switches installed in the door jambs, thedoor lock cylinders, and the trunk lock cylinder(Figure 15-41). After the system is armed, anytampering with the lock cylinders or an attempt toopen any door or the trunk lid without a keycauses the alarm controller to trigger the system.Once a driver has closed the doors and armedthe system, an indicator lamp in the instrumentcluster comes on for several seconds, and thengoes out. The system is disarmed by unlocking afront door from the outside with the key or turningthe ignition on within a specified time. If thealarm has been set off, the system can be disarmedby unlocking a front door with the key.Delphi (Delco) UTD SystemThe Delphi universal theft deterrent (UTD)system was introduced on some 1980 GM modelsand offered as an option until it was supersededby the personal automotive security system(PASS). The circuitry, logic, and power relaysthat operate the system are contained within acontroller module.When the system is armed by the driver, asecurity system warning lamp in the instrumentpanel glows for four to eight seconds after thedoors have been closed, then shuts off. The systemcan be disarmed without sounding the alarmby unlocking a front door from the outside with akey, or by turning the ignition switch on. If thealarm has sounded, it can be shut off by unlockingone of the front doors with a key.
342 Chapter FifteenFigure 15-40.DaimlerChrysler keyless entry system schematic. (DaimlerChrysler Corporation)If the system is armed and a door is openedforcibly, a two-terminal doorjamb switch activatesthe alarm through one terminal. The other switch terminaloperates the interior lights. On vehicles withpower door locks, the circuits are separated by adiode. Tamper switches are installed in all door locksand the trunk lid lock (Figure 15-42). The switchesare activated by any rotation or in-and-out movementof the lock cylinders during a forced entry. A disarmswitch in the LH door cylinder (Figure 15-43) allowsthe owner to deactivate the system without soundingthe alarm before entering the vehicle. All tamperswitches should be kept clean, as corrosion can causethe system to activate without apparent reason.Exact wiring of the UTD system depends on theparticular vehicle and how it is equipped. To understandjust how the system works on a given vehicle,you must have the proper wiring diagram.
- Page 303 and 304: 290 Chapter ThirteenFigure 13-12.AB
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342 Chapter Fifteen
Figure 15-40.
DaimlerChrysler keyless entry system schematic. (DaimlerChrysler Corporation)
If the system is armed and a door is opened
forcibly, a two-terminal doorjamb switch activates
the alarm through one terminal. The other switch terminal
operates the interior lights. On vehicles with
power door locks, the circuits are separated by a
diode. Tamper switches are installed in all door locks
and the trunk lid lock (Figure 15-42). The switches
are activated by any rotation or in-and-out movement
of the lock cylinders during a forced entry. A disarm
switch in the LH door cylinder (Figure 15-43) allows
the owner to deactivate the system without sounding
the alarm before entering the vehicle. All tamper
switches should be kept clean, as corrosion can cause
the system to activate without apparent reason.
Exact wiring of the UTD system depends on the
particular vehicle and how it is equipped. To understand
just how the system works on a given vehicle,
you must have the proper wiring diagram.
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