Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
My front doors will not open by the outer handles on my 2005 Cadillac STS. I have already checked the fuses, and they seem to be good. Also, the battery was so dead that the dash would light up, but if the car was started they would go out. The back doors will lock and unlock from fob and front doors as well as the front doors will open with inside latch.
Both front outer door handles are just ornaments at this point, they do nothing. From the fob and lock switches the little lights will come on on top of front doors.
I do not understand your issue. Is it that the key FOB won’t unlock the doors, or is it the door handles won’t open the doors? And what battery is dead?
Both batteries are new and good. The front door handles simply don’t do a thing. You can lock rear and unlock rear doors with FOB but it is unable to tell if it makes the front doors do anything, the little red lights on front door come on for a bit. The front door handles are electric and do not open the door.
Does the power lock buttons on the inside of the doors lock & unlock the front doors?
No the lock and unlock back doors and make red lights on front doors come on.
Would there not be the noise of these solenoids moving. There is absolutely no sound coming from that door.
Possibly not. Can you hear the rear door lock actuators moving? If the front ones aren't connected to the arms, they may just actuate freely, not making a lot of noise. However, you may have a Drivers Door Module that is not functioning correctly, or the actuators are NG. Here is the description of operation. Take a look at it & try to do a functionality test. This would be to see if everything else is functioning correctly. I also want you to make sure you look in Featured Programming to see if you have something turned off.
Keyless Entry System Description and Operation
Keyless Entry System Description and Operation -Active
The keyless entry system is a vehicle entry device. The keyless entry system is used in conjunction with the door locks to unlock the vehicle. Keyless entry will lock/unlock a door or open the rear compartment lid when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency (RF) to the remote control door lock receiver (RCDLR). The RCDLR has an external antenna in the back glass that receives the RF signal. The RCDLR interprets the signal and activates the requested function via a serial data message. A low transmitter battery or RF interference from aftermarket devices, such as 2-way radios, power inverters, computers, etc., may cause a system malfunction. High RF traffic areas, such as gas stations that use pay-at-the-pump RF transponders, may also cause interference that could lead to a malfunction. Keyless entry allows you to operate the following features:
Rear compartment lid release
Illuminated entry lamps
Panic alarm/Vehicle locator
Remote vehicle start
Keyless Entry System Description and Operation -Passive
Passive keyless entry allows entry to a locked vehicle without pressing any buttons on the keyless entry transmitter. You must only have the transmitter with you. This passive system is also part of the vehicle starting system. It allows you to start and run the vehicle having only the transmitter as your key. The passive entry and starting system use low frequency antennas in 4 different areas on the vehicle to determine the location of the transmitter. When passively opening a locked door or the rear compartment lid, you must have a programmed transmitter with you in your pocket, purse, or briefcase. As a customer opens the door handle or presses rear compartment touch pad, the low frequency antenna sends out a challenge to the keyless entry transmitter. The transmitter must be in a one meter range of the door or rear compartment lid in order to receive the challenge. If the challenge is met, the transmitter will respond, allowing the door to be unlocked and opened. Passive entry allows you to operate the following features:
Passive door unlock/unlatch
Passive rear compartment lid release
The keyless entry system has the following components:
Keyless entry transmitters
LH and RH door antennas (part of the door handle assembly)
Rear compartment antenna
Console passive antenna
Console active antenna
Instrument Panel Module (IPM)
Rear Integration Module (RIM)
Remote Control Door Lock Receiver (RCDLR)
External RF Antenna (includes coax from RCDLR to back glass)
Keyless Entry Transmitters
The keyless entry transmitters are used to actively lock and unlock the vehicle doors, release the trunk, initiate a remote start event, and to initiate a panic alarm.
The transmitters can also be used passively to enter and start the vehicle. By pulling either of the front exterior door handles, a nearby programmed transmitter is challenged via the door antennas. The transmitter will respond by sending an RF signal to the RCDLR via its external antenna located in the back glass; the RCDLR will then interpret this communication and either allow entry into the vehicle or deny it.
Regardless of whether the transmitter is responding to an active function (button press on the fob) or a passive function (starting the vehicle), the transmitter ALWAYS responds via RF to the RCDLR's external antenna.
The keyless entry door antennas are used to transmit low frequency communications to the keyless entry transmitters.
The keyless entry door antennas are molded into the vehicles LF and RF exterior door handles. The antennas are serviced as part of the door handle assembly. The antennas are controlled by the RCDLR. When the exterior door handle is pulled, the respective antenna sends out sends out a challenge to the keyless entry transmitter which begins the passive entry communications.
Rear Compartment Antenna
The rear compartment antenna is used to transmit low frequency communication to the keyless entry transmitters for entry to rear compartment.
The rear compartment antenna is located behind the rear fascia and is accessed from under the vehicle. The antenna is controlled by the RCDLR. When the rear compartment touch pad is pressed, the antenna sends out a challenge to the keyless entry transmitter which begins the passive entry communications.
Headliner and Console Passive Antennas
The headliner and console passive antennas are used to transmit low frequency communication to the keyless entry transmitters to determine whether there are any inside the vehicle compartment.
The keyless entry headliner antenna is located under the vehicle's headliner. The keyless entry console passive antenna is located under the trim below the cup holder. The antennas are controlled by the RCDLR and are driven simultaneously. When the vehicle's start/stop button is pressed or when the doors are closed, these antennas send out a low frequency challenge to the keyless entry transmitter, which begins the passive communications.
Console Active Antenna
The console active antenna is used to transmit a low frequency challenge to the transmitter in the event that the transmitter does not respond to the headliner/console passive antennas during a starting event. The active antenna is also used during transmitter programming events.
The keyless entry console active antenna is located in the center console. The console active antenna is controlled by the RCDLR. It has a small pocket next to it where the transmitter can be inserted if its battery is dead, weak, or the RF signal is being interrupted. If properly inserted in the pocket (buttons facing forward), the active antenna should always cause the transmitter to respond properly.
Remote Control Door Lock Receiver (RCDLR)
The RCDLR is a multi-function module which controls all the vehicles antennas for passive keyless entry functions. The RCDLR also acts as the receiver for active keyless entry and tire pressure monitoring (TPM) functions, as well as controlling all immobilizer functions.
The RCDLR's RF antenna is located in the back glass, and there is a coax cable connecting the glass antenna to the module located in the trunk.
External RF Antenna
The external RF antenna is located in the back glass, just under the rear defrost grid. There is a coax antenna that connects the antenna in the back glass to the RCDLR. This antenna is responsible for receiving the RF communication from the TPM senders and the keyless entry transmitters (for both active and passive functions).
Unlock Driver Door Only - Active
Momentarily press the transmitter UNLOCK button in order to perform the following functions:
Unlock only the driver door
Illuminate the interior lamps for a determined length of time, or until the ignition is turned ON
Flash the exterior lights, if enable through personalization
Disarm the Content Theft Deterrent (CTD) system
Deactivate the CTD system when in the alarm mode
Unlock All Doors - Second Operation -Active
Momentarily press the transmitter UNLOCK button a second time, within 5 seconds of the first press, to perform the following function:
Unlock the remaining doors
Unlock Driver Door Only - Passive
If enabled through personalization, approach the driver door with a valid keyless entry transmitter and pull the door handle to perform the following functions:
Unlock only the driver door when door handle is operated
Disarm the CTD system, if equipped
Unlock All Doors - Passive
If enabled through personalization, approach either front door with a valid keyless entry transmitter to perform the following functions:
Unlock all vehicle doors when the approached door handle is operated
Lock All Doors - Active
Press the transmitter LOCK button to perform the following functions:
Lock all vehicle doors
Immediately turn off the interior lamps
Flash the exterior lights, if enabled through personalization
Chirp the horn, if enabled through personalization
Arm the CTD system
Lock All Doors - Passive
If enabled through personalization, exit the vehicle with the keyless entry transmitter to perform the following functions:
Lock all vehicle doors after a delay
Chirp horn, if enabled through personalization
If more than one keyless entry transmitter is within a vehicle and the RCDLR detects that transmitter has been left in the vehicle after an exit, the transmitter left within the vehicle will be temporarily deactivated until the CTD system has been disarmed.
Rear Compartment Lid Release - Active
If the vehicle transaxle is in PARK or NEUTRAL and the ignition is in the OFF position, a single press of the transmitter rear compartment release button will open the rear compartment lid.
Rear Compartment Lid Release - Passive
Approach the rear of the vehicle with a valid keyless entry transmitter. Press the rear compartment lid release touch pad. The rear compartment lid will open.
A keyless entry transmitter left inside the truck will allow the trunk to be reopened at any time. This feature will not allow a customer to lock the transmitter in the trunk.
Vehicle Locator/Panic Alarm
A single press of the panic button performs the following functions. Some functions may be dependent on personalization settings:
Pulses the horn three times
Flashes the exterior lamps three times
A press and hold of the panic button performs the following functions:
Illuminates the interior lamps
Pulses the horn and flashes the parking lamps for 30 second or until the following conditions occur:
The panic button is pressed
The ignition switch is turned to the RUN position with a valid key
Remote Vehicle Start (RVS)
The remote vehicle start (RVS) function allows engine starting while not in the vehicle. It also allows the vehicle HVAC system and other vehicle systems to enable, providing a comfortable vehicle upon entry. RVS functions have an operating range of up to 195 feet, depending on conditions. The RVS sequence begins by pressing and releasing the lock button and then pressing and holding the RVS buttons on the keyless entry transmitter. The turn signal lamps will illuminate to indicate the vehicle has received the remote start request. Each time an RVS is performed, the vehicle doors are locked, however they may then be unlocked/locked with the transmitter or vehicle key at any time. Once activated, the engine is allowed to run for 10 minutes. The RVS time may be extended by an additional 10 minute by again pressing and releasing the lock button and then pressing and holding the RVS buttons on the transmitter. This feature is called a RVS continue and allows a maximum of 20 minutes of engine running. If the RVS continue is performed at 7 minutes into the initial 10 minute time-out, a total of 17 minutes of engine running would occur. The RVS event may be suspended at any time by pressing only the RVS button on the transmitter or by entering the vehicle and turning ON the hazard lamps.
In between ignition cycles, only two RVS events may occur or be attempted. Once two events or attempts have been made, future RVS events will be suspended until the vehicle is started using the ignition.
Using the driver information center (DIC), RVS may be enabled or disabled as a part of vehicle personalization. Refer to the vehicle owners manual for more information.
Hood Ajar Switch
The hood switch provides status of the hood to the BCM for RVS purposes. The switch is integrated into the hood latch assembly. The hood ajar switch provides 2 separate inputs to the BCM. These separate inputs allow the BCM to actively monitor for a hood ajar switch fault.
RVS Circuit Description
The RCDLR receives a signal from the keyless entry transmitter indicating a RVS request. A message is then sent to the BCM which determines if a crank request message will be sent to the ECM to activate RVS. The BCM looks at the following inputs to verify the system is ready for an RVS event:
Vehicle is not in valet mode
All vehicle doors are closed
Rear compartment lid is not ajar
The hood is closed
The doors are locked
The hazard switch is OFF
Battery reconnect has not occurred
Vehicle power mode is correct.
When the BCM determines all conditions meet those required for an RVS event, a message is sent via serial data to the BCM. The ECM relies on the RVS message from BCM, to enable RVS when the crank request signal is received. If the ECM does not receive a valid RVS message, it will not ground the control circuit of the crank relay and start the engine. While the ECM is in RVS mode it will cut fuel to the engine if any of the following additional conditions occur:
Vehicle speed is greater than 0.
Transmission is not in P.
Excessive engine coolant temperature
Low oil pressure
The malfunction indicator lamp (MIL) is commanded ON.
Engine crank time is greater than 30 seconds.
Excessive engine speed.
Accelerator pedal position too high.
Remote start timer equals 0.
Immobilizer system indicates a theft attempt
Keyless Entry Personalization
Vehicle lock/unlock functions and remote vehicle start (RVS) settings may be personalized for the vehicle. For functional descriptions and programming instructions, refer to the vehicle owner’s manual.
Low Fob Battery Message
A LOW FOB BATTERY message may be seen on the DIC when the fob's battery voltage has been lower than 2.6 volts for three consecutive ignition cycles (OFF to ACC or OFF to RUN). The RCDLR monitors the voltage of each fob independently; however, if two fobs are present when starting the vehicle, the voltage will be monitored only on the fob that starts the vehicle. For example, if Fob 1 enters from the driver door and Fob 2 enters from the passenger door, the RCDLR will monitor only Fob 1. To determine the fob being monitored, check which driver ID is present when the vehicle is started. The driver ID will correspond with the fob being monitored.
Fob battery voltage may also be observed using the scan tool. The scan tool displays the actual battery signal voltage, as well as the low voltage signal. These parameters may be used to determine which fob has caused the LOW FOB BATTERY message to be displayed.
The battery is fine and works the rear doors and trunk. No FOB message. The car starts when FOB is in car and says FOB is too far away if out of range.
Last thing before we go to the dealer. The battery is located under the hood. I want you to disconnect the Negative Cable, then the Positive Cable & hold them together for 5 Minutes. After 5 minutes, reconnect the Positive Cable, Then the Negative Cable, and try the doors again.
What this does is drains all the power from ALL the modules in the car. These modules are controlled by one main module called the Mode Master. It is usually a primary module that is the Mode Master and its primary responsibility is to "wake" all other modules in the car sequentially. If the sequence is out of order, some modules may not wake up at all. The drivers & passengers doors both have separate modules that control door functions separately. If these modules are not functioning, the door functions will not work.
There also may be a software upgrade that may have to happen at the dealer. I do not know if there is a software upgrade just by looking at the Service Information from GM, but I can see if there are any open campaigns on your vehicle if you give me the full VIN#. Try the battery first, & let me know how you make out. Remember, ALL memory will be erased from ALL modules including the radio. So be prepared to reset all the radio stations & featured programming. Let me know!
Did you perform the battery disconnect procedure yet? I also see that his car has been salvaged. So, you might have a host of wiring issues as well. There are no outstanding campaigns, and the warranty has been discontinued.
If there has been welding done to this vehicle without disconnecting the battery you may have blown up the modules.
The car was keyed in a parking lot and no one has welded on it.