20 Most Recent 1998 Cadillac DeVille - Page 2 Questions & Answers

Most modern cooling systems are pressurized, the operating pressure is determined by the radiator cap. Check the pressure rating on your cap, and you can determine the boiling point of water. A 14 psi cap = 245 degrees F, at 16 psi = 250 degrees, etc. Coolant ("antifreeze") runs higher than that. Modern engines are more efficient at these higher temperatures, which is why they use a pressurized system. So if you're not getting any caution lights, and you cooling fan(s) are working, you're probably OK. But this also explains why you NEVER remove the radiator cap while the engine is at operating temperature - the reduction in pressure in the entire system means ALL the coolant is above its boiling point, and it WILL all try to get out at once!

Since the replacement is a different one from the one you are replacing, the car wiring harness is probably different from the one needed for the new radio. This is a really important difference if the new one is part of a Bose system and that is not the option installed in your car. The best way to check is for you to identify the option codes for each radio and go to alldatadiy.com and compare the wiring diagrams.

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. Components 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) System Functions 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 .

Call a Cadillac dealer and ask them the question. I am not certain you car has such a switch, so be prepared for the possibility that you car has none.

It should be around 198 for emission reasons but could go as high as 210 but don't worry till you get passed 215 and it keeping going because it wont stop after that.

-david

I suspect parasitic draw. All vehicles draw some power from the batteries when the car is shut off. Certain accessories such as clocks, radios remote door openers and alarms always need power. The normal power used is called parasitic draw. It is always a very low draw so it doesn't run the battery down. If you install accessories like shortwave radios or plug things like inverters and portable refrigerators into the accessory socket and operate them too long without the engine running you can drain your batteries to the point where the engine won't start. If there is an electrical short in the vehicle or a malfunctioning accessory it could be drawing much more than its normal load causing a drain on the batteries. If you leave your door open and the inside lights stay on all night you could drain the battery down till the car won't start.Here's also a good resource for your car specifically on narrowing down the cause of the drain.

Turn the radio OFF with the key on. Push the set button and use the scan and search buttons to set the time

First try another key if you have one. If that doesn't work then remove the negative wire, wait a few minutes, reconnect and try. If that doesn't work then you might have broken cable to the ignition switch.

the "low Side" is on the receiver drier hose it should be visible on the passenger side of the engine compartment