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One of the modules may be doing it , interior light lit -glove box ! Hard to say on newer vehicles , after 1996 ! You vehicle has some of these modules if not all !
The class 2 serial data line on this vehicle is a star configuration. The following modules communicate on the class 2 serial data line:
The body control module (BCM)
The digital radio reciever
The driver door module (DDM)
The electronic brake control module (EBCM)
The front passenger door module (FPDM)
The HVAC control module
The inflatable restraint sensing and diagnostic module (SDM)
The instrument panel cluster (IPC)
The memory seat module (MSM)
The powertrain control module (PCM)
The radio amplifier
The rear seat audio (RSA) controller
The rear seat entertainment (RSE) assembly w/U42
The rear wheel steering control module
The remote playback device-CD player w/U1S
The transfer case shift control module
The transmission control module (TCM) w/Allison Transmission
The theft deterrent control module
The vehicle communication interface module (VCIM) w/UE1
RFA means radio frequency actuation. This usually indicates one of your key fob batteries are getting weak. They work off RFA, by remotely operating your door locks thru radio signals. Its best to change the batteries in both remotes at the same time. They shouldn't, but not always need reprogramming. After replacing the battery, simply press the lock and unlock buttons together to re-synchronize the key fobs.
There is a blower motor resistor located up under the passenger side dash. I believe there is actually 3 fuses that can cause problems with the blower....relays/fuses should be located in the engine compartment fuse block. They are High Blower fuse-HVAC fuse-Radio/HVAC/RFA/Cluster/etc...fuse. Hope this helps.
Use these instuctions if your Deville has an Analog Instrument Cluster 1.Press OFF and WARM buttons onClimate Control Panel (CCP) simultaneously. (Instrument Panel Cluster (IPC) will light all telltales, then go blank) System is now in diagnostic mode. Press PASSENGER COOLER button until “RFA” is displayed, then press FAN UP. If“RFA DATA” is displayed, press FAN DOWN. If“RFA OVERRIDE” is displayed, press FAN UP. 2.If“RFA 500 NO OVERRIDE” is displayed, press FAN DOWN. If“RFA 501 PROGRAM FOB #1” is displayed, Press FAN UP. 3.IPC will show “0” on right side of Driver Information Center (DIC) display. Press warmer button on climate control unit until “99” is displayed. 4.Press and hold TRUNK button on transmitter. While holding TRUNK button, press LOCK button and hold for one second. Hold both buttons for a total of 3 seconds. Locks cycle when programming is complete (if remote is not programmed within 30 seconds after entering “99” override display, system will default and you must begin again at step 2. 5.To program a second remote, press FAN DOWN button until“RFA 502 PROGRAM FOB #2” is displayed, then press FAN UP.Repeat step 4. To exit system, press AUTO, MODE UP, MODE DOWN, or RESET.
Use these instructions if your DeVille has a Digital Instrument Cluster
1.Press OFF and WARM buttons on Climate Control Center (CCC) simultaneously. Instrument Panel Cluster (IPC) will light all telltales, go blank then enter DIAGNOSTICMODE. Press FAN DOW button to scroll through system until “RFA” is displayed, then press FAN UP button. Press FAN DOWN button until “RFA OVERRIDE” is displayed, then press FAN UP button. When“NO OVRD RF 500” is displayed, then press FAN UP button. 2.When “PGM FOBL 501” is displayed, press WARM button and “99” will be displayed in left upper corner of IPC just below odometer. System is now ready to program remote. 3.Press and hold TRUNK button on transmitter. While holding TRUNK button, press LOCK button and hold for one second. Hold both buttons for a total of 3 seconds. Locks cycle when programming is complete (if remote is not programmed within 30 seconds after entering “99” override display, system will default and you must begin again at step 2.) 4.To program second remote, pres FAN UP button until “PGM FOB2 502” is displayed, then follow steps 2 and 3 to program second remote. To exit system, press RECIRC or RESET buttons.
Your blower is not shutting off - so your BMCP (Blower Motor Control Processor) has malfunctioned... or the HVAC Control Module has failed.
Both provide power to the blower motor.
To check which one has failed - pull the HVAC control fuse RADIO/HVAC/RFA/CLSTR/ALDL (15Amp) and see if the fan shuts off - if not - try the BMCP fuse HI/BLWR (30Amp) - Both are listed listed at the top of the schematic.
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First off you need to know how these thing's work ,computer controlled .
Trunk Release Function
When the PZM receives a serial data message for the activation of the trunk release solenoid from the instrument cluster or from the RFA, the PZM energizes the trunk release relay under the following conditions:
• The transmission is in PARK
• The valet lockout switch is not activated.
This vehicle has electronic components which the service technician controls in order to provide valuable self-diagnostic information. These components are part of an electrical network that controls various engine subsystems and various body subsystems. A description of each of these subsystems is in the appropriate subsection of this service manual. These major components that compromise the computer system monitor the system sensors and the system switches. These components are the following:
• The powertrain control module (PCM)
• The instrument cluster
• The air controller module (ACM)
• The sensing and diagnostic module (SDM)
• The electronic brake and traction control module (EBTCM)
• The continuously variable road sensing suspension module (CVRSS)
• The body control module (PZM)
• The integrated radio controller (IRC)
• The remote function actuator (RFA)
• The climate control panel (CCP)
• The cellular telephone (PHN)
The body control module (PZM) performs the following functions:
• HVAC afterblow control
• Battery guard
• Door lock and unlock
• Fuel level
• Retained accessory power (RAP)
• Theft deterrent
• Exterior lighting control
• Interior lighting control
• Trunk release
• Time of day for the radio display
• Rear defogger
• Fuel door release
• Vehicle personalization
For more information about these functions refer to the appropriate sections.
Your probably have a lose connection somewhere , ground for the BCM or instrument cluster . Behind the dash or instrument cluster ! or other places . G-400 ,G205
The instrument cluster supplies the turn on signal for the alternator
DTC B1910 Generator L-Terminal Open Circuit
DTC B1911 Generator L-Terminal Problem
DTC B1981 Battery Voltage Low
The generator provides the voltage to operate the vehicle's electrical system and to charge the battery through CKT 1 (RED). When the ignition switch is placed in RUN, narrow width pulses on CKT 23 (GRY) are supplied by the powertrain control module (PCM) to the rotor, creating a weak magnetic field. When the engine is started, the regulator senses the generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This regulates the generator output voltage for proper battery charging and electrical system operation.
The PCM turns on the VOLT indicator via Class 2 serial data line CKTs 1807 (PPL) whenever undervoltage, overvoltage, or a stopped generator is detected on CKT 225 (RED).
When the ignition switch is placed in the RUN position, voltage is supplied to generator terminal L by the instrument cluster, turning on the regulator. The generator's voltage regulator controls current to the rotor, thereby controlling the output voltage. The rotor current is proportional to the electrical pulse width supplied by the regulator. When the engine is started, the regulator senses generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This operation regulates the generator output voltage for proper battery charging and electrical system operation. The generator F terminal is connected internally to the voltage regulator and externally to the PCM. The PCM monitors the field voltage on the generator F terminal.
It's more then likely just a lose connection somewhere . Could take half your vehicle apart to find it .
My first place to look would be here , G400
In the left rear of the passenger compartment, under the rear seat
BCM ground .