Part 3 of 3
POWER DOOR LOCKSPower door locks are standard equipment on all Prowler vehicles and have the following features:
- Automatic door locks - automatically lock the doors when all doors are closed and the vehicle reaches a speed of 18 mph. This feature can be enabled/disabled by the DRB III or by the customer cycling the ignition key from "Off to Run" four times (leaving the key in the OFF position) then pressing any power "lock" switch and removing the key from the ignition switch. A single chime will signal programming completed.
- Power door lock inhibit feature - cancels lock switch actuation when the key is in the ignition and either door is open.
- To prevent motor burnout, the BCM will pulse the lock/unlock relays a maximum of 4 seconds. Even though the switch may be held down longer.
- This vehicle is NOT equipped with central locking (unlocking one door with the key opens both doors). However, the vehicle is equipped with door key cylinder switches that are used exclusively for the vehicle theft security system and will arm or disarm the system.
Remote keyless entry (RKE) (Standard Equipment)
The body control module interfaces with the remote keyless entry module via a one-way serial bus interface. The RKE module is located under the left side of the instrument panel top cover. It does not actuate relays directly but receives the signal from the transmitter and then communicates with the BCM.
Two transmitters are provided with each vehicle, but the RKE module is capable of accommodating four transmitters. The transmitters can be programmed by using the DRB III or the customer can add a transmitter providing a valid previously programmed transmitter exists. This is accomplished by pressing and holding the programmed transmitter unlock button from 4 to 10 seconds and then while still pressing the unlock button, press and release the panic button. This will put the BCM in programming mode. The customer will have approximately 30 seconds to press any button on each transmitter thereby programming that transmitter to the receiver. A technician with the DRB III can reprogram any RKE module providing VTSS is disarmed.
The RKE system, operated by the transmitter, has three modes of operation controlled by three buttons.
- Unlock button: Pressing the unlock button once will unlock the driver's door, disarm VTSS and illuminate the interior lamps. Pressing the unlock button twice within 5 seconds unlocks both doors.
- Lock button: Pressing the lock button locks all doors and sounds the horn once (if horn chirp is enabled).
- Panic button: When the panic button is pressed the horn is pulsed, the headlamps and marker lamps are flashed and the interior lamps are turned ON. This will last for up to 3 minutes or until the panic button is pressed again or the ignition is turned ON. The panic feature only works when the ignition is in the OFF position.
*Horn chirp: When all doors are closed and a lock command is sent by the RKE transmitter, a horn chirp will be heard. The horn chirp is also customer programmable by pressing and holding the lock button on the transmitter for 5 seconds and then while still holding the lock button, pressing the unlock button and releasing both. This will toggle (enable/disable) the horn chirp.
VEHICLE COMMUNICATION
The Chrysler Collision Detection multiplex system (CCD bus) consists of a twisted pair of wires. These wires run from one module to another. They receive and deliver coded information between the modules. The information is coded to identify the message as well as the importance of the message. When there are multiple messages trying to access the CCD bus at one time, the code determines the message that has higher priority, which is then allowed to access the bus first.
The two wires of the twisted pair that make up the CCD multiplex system are called "bus +" (bus plus) and "bus-" (bus minus) respectively. Each wire has a measurable voltage level of roughly 2.5 volts. In order to maintain the 2.5 volts on each line and provide a means of transportation for the coded messages, there is a "voltage divider network". This network consists of some modules with bias and some with termination. Bias is the part of the voltage divider network that places both bus + and bus - at 2.5 volts. Termination in the circuitry is required to complete the voltage divider network and also provides some electromagnetic protection for the bus.
NOTE: Communication over the bus is essential to the proper operation of the vehicle's on-board diagnostic systems and the DRB III. Problems with the operation of the bus or DRB III must be corrected before proceeding with diagnostic testing. If there is a problem, refer to the vehicle communications section.
Bus Failure Messages
- Short to Battery - Either or both of the bus wires are shorted to the battery potential or a specific ground may be open.
- Short to 5 Volts - Either or both of the bus wires are shorted to a 5-volt potential.
- Short to Ground - Either or both of the bus wires are shorted to ground.
- Bus (+) & Bus (-) Shorted Together - The two bus wires are shorted together.
- No Termination - The bus system has lost connection with all of its terminators.
- Bus Bias Level Too Low - Either or both of the bus wire potentials are significantly below their normal 2.5 volts.
- Bus Bias Level Too High - Either or both of the bus wire potentials are significantly above their normal 2.5 volts.
- No Bus Bias - The bus system has lost connection with termination and/or bias.
- Bus (+) Open - The bus (+) wire has lost connection with termination and/or bias.
- Bus (-) Open - The bus (-) wire has lost connection with termination and/or bias.
- Not Receiving Bus Messages Correctly - The DRB III cannot communicate over the bus and does not know why.
VEHICLE THEFT SECURITY SYSTEM (VTSS)
The vehicle theft security system is controlled by the body control module and is standard equipment on all Prowler vehicles. It monitors the doors, decklid, hood and ignition circuit to determine if the alarm should be triggered and engine disabled. When the system is armed, the BCM removes the ground from the decklid release switch thereby preventing a thief from accessing the trunk area.
When the alarm is triggered, the engine becomes disabled. In addition the horn is pulsed, the headlamps and marker lights will flash for (3) three minutes. After the 3 minute alarm has expired the BCM will return to an armed state and ignore the input(s) that triggered the initial alarm, unless those inputs return to an inactive state. The VTSS LED will also flash at a new rate indicating that the vehicle has been tampered with. All other monitored inputs will re-trigger the (3) minute alarm if they become active.
If during the (3) minute alarming period the BCM receives a request from the RKE module to enter panic mode, the BCM will cancel the (3) minute alarm, return to VTSS armed state and then perform the RKE panic feature.
WIPER SYSTEM
The wiper system provides the driver with normal wipe (low and high speeds), intermittent wipe, wipe after wash, and pulse wipe functions. The driver selects the wiper function via a resistive multiplexed stalk switch mounted on the steering column. The low and high speeds are directly controlled via the multifunction switch. The intermittent function is controlled through the intermittent wiper relay and the BCM.
System Features
Speed Sensitive Intermittent Wipe Mode - There are 6 individual delay times with a minimum delay of 1/2 second to a maximum of 18 seconds. When the vehicle speed is under 10 mph, the delay time is doubled providing a range of 1 second to 36 seconds.
Pulse Wipe - When the wiper is in the OFF position and the driver presses the wash button for more than 62 milliseconds, but less than 1/2 second, 1 wipe cycle in low speed mode will be provided.
Wipe After Wash Mode - When the driver presses the wash button for over 1/2 second and then releases it, the wiper will continue to run for 2 additional wiper cycles.
The wiper system utilizes the BCM to provide intermittent operation. The low and high speed are run directly from the multifunction switch. The BCM controls the intermittent relay to change the wiper delay as the multifunction switch input changes. The BCM uses vehicle speed input to double the usual delay times below 10 mph.