Top 20 2002 Cadillac Deville Questions & Answers

Because there are many entertainment system options for this vehicle, your only option will be to get the wiring diagrams from a service manual or a site such as and look up your particular system option.

2002 Cadillac... | 70 views | 0 helpful votes

I suggest you try one of those instant download manuals. My nephew bought one for me when my car broke and we could fix it all by ourselves with the manual costing $10. This website is very good for this.
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2002 Cadillac... | 284 views | 0 helpful votes

BCM has nothing to do with it. The CCM - cruise control module receives input from the cruise control switch, free wiring diagrams here enter vehicle info. under system click on engine, then under subsystem click speed control. Click the search button then the blue link.

2002 Cadillac... | 112 views | 0 helpful votes

you might have a vacuum leak ,a broken or loose vacuum hose to one of the actuatores that open and close the vents

2002 Cadillac... | 87 views | 0 helpful votes

Does air flow from the defroster vent ? Ticking is probably from stripped gear's in side the mode door actuator. electric . May have video on youtube showing how to test an replace .

2002 Cadillac... | 102 views | 0 helpful votes

Are you sure you replaced the bulbs with the same brand/model as on the passenger side? There are a lot of different versions with different light colors and intensities.
If so, have you made sure there is no water vapor in the headlight housing, and that the silvering inside is not degraded?

2002 Cadillac... | 141 views | 0 helpful votes

common problem i believe its the blower relay switch

If you need further help, I’m available over the phone at

2002 Cadillac... | 107 views | 0 helpful votes

Did you replace those parts based on the trouble code? Or are you just throwing parts at it? What are the codes?

2002 Cadillac... | 220 views | 0 helpful votes

Replace the battery and have the alternator tested at the auto parts store for free.

2002 Cadillac... | 213 views | 0 helpful votes

Do you know how to do electrical testing using a wiring diagram and a DVOM - digital volt ohmmeter ? Do you know how complex the electronic's are on your vehicle are . Could be something simple but then again may not be . Hooking up a professional type scan tool that can check for DTC'S in all the modules on the vehicle would be the first step in diagnosing this ! Do you know what a electronic control module is ? Your vehicle can set hundreds of code's an they don't all turn on the check engine light . Moving the ignition switch to the CRANK position sends a 12 V signal to the PCM Ignition Crank Sense. The PCM verifies that the transmission is in the PARK or NEUTRAL position. The PCM then grounds the control circuit of the START relay. When the START relay is energized it allows voltage to the starter solenoid S terminal.Do you know what Data Link Communications are ?
The data link connector (DLC) allows a scan tool to communicate with the class 2 serial data line. The serial data line is the means by which the microprocessor-controlled modules in the vehicle communicate with each other. Once the scan tool is connected to the class 2 serial data line through the DLC, the scan tool can be used to monitor each module for diagnostic purposes and to check for diagnostic trouble codes (DTCs). Class 2 serial data is transmitted on a single wire at an average of 10.4 kbps. This value is an average; class 2 uses a variable pulse width modulation to carry data and depending on the message it may operate faster or slower. The bus will float at a nominal 7 volts during normal operation. Each module can pull this lower during the transmission. The bus is not at battery positive voltage or ground potential during normal operation. When the ignition switch is in RUN, each module communicating on the class 2 serial data line sends a state of health (SOH) message every 2 seconds to ensure that the module is operating properly. When a module stops communicating on the class 2 serial data line, for example, if the module loses power or ground, the SOH message it normally sends on the data line every 2 seconds disappears. Other modules on the class 2 serial data line, which expect to receive that SOH message, detect its absence; those modules in turn set an internal DTC associated with the loss of SOH of the non-communicating module. The DTC is unique to the module which is not communicating; for example, when the inflatable restraint sensing and diagnostic module (SDM) SOH message disappears, several modules set DTC U1088. Note that a loss of serial data DTC does not normally represent a failure of the module that set it.

Your best bet would be to have a qualified repairs shop check it out .

2002 Cadillac... | 84 views | 0 helpful votes

Cheap. Replace the alternator if you can get it off. Casting broken will be difficult to keep the belt tight. If you can do it with a washer, sounds tough because the surface of alternarors are curved and stuff.

2002 Cadillac... | 35 views | 0 helpful votes

The floats on those reservoirs are bad to stick because of the sealer you have to keep adding to the fluid. I got mine unstuck by removing it the reservoir and thoroughly cleaning it with dish soap. Good luck. I could not see a way to remove or replace the float.

2002 Cadillac... | 60 views | 0 helpful votes

Try unplugging vacuum line from the EGR valve and plug the hose with a 1/4 inch bolt.

2002 Cadillac... | 69 views | 0 helpful votes

Whatever is causing the timing adjust itself at the wrong time. It could be anything from a vacuum leak, to a coolant sensor to electrical problem. By reading all the LIVE READINGS from the sensors & getting an emissions reading will help u narrow down the problem. It doesn't sound like a DIY fix. Equipment needed

2002 Cadillac... | 59 views | 0 helpful votes

Fuel Pump Relay
Fuel Filter
Electrical Issues to the injectors

Its definitely fuel related if it goes off starting fluid, your having a delivery issue.

2002 Cadillac... | 45 views | 0 helpful votes

There isn't one !
Filling Procedure
Notice: Do not add cold water to the cooling system with the engine at or above operating temperature. Adding cold water causes rapid cooling, resulting in possible engine damage.
NOTICE: When adding coolant, it is important that you use GM Goodwrench DEX-COOL® or HAVOLINE® DEX-COOL® coolant. If Coolant other than DEX-COOL® or HAVOLINE® DEX-COOL® is added to the system the engine coolant will require change sooner; at 50 000 km (30,000 mi) or 24 months.
Notice: Do not use a solution stronger than 70 percent antifreeze. Pure antifreeze can freeze at -22°C (-8°F).
Important: This engine is not equipped with block drains, 2.5 L (2 qt) of residual coolant remains in the engine block.
Refill the cooling system. In order to ensure sufficient engine cooling, freezing and corrosion protection, maintain the protection level at -37°C (-34°F) or lower.
Start the engine.
Place the heater and A/C control in any A/C mode except Max and the temperature in the highest setting.
Allow the engine to continue idling until the lower radiator to water pump hose is hot.
Turn OFF the engine.
Allow the engine to cool to outside temperature. Ensure the coolant level in the surge tank is at the proper level (1).

2002 Cadillac... | 317 views | 1 helpful votes

The drain valve is at the bottom of the radiator (as usual) - have fun getting to it!

2002 Cadillac... | 218 views | 0 helpful votes

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