Some vehicle parts deliver an outstanding performance. You can use the item repetitively without worrying about premature failure.
Other items are considered a high-failure part. The central timer module is one of them.
You can find this part to the left of the steering column. If you think it failed, a decent auto electric shop can test and diagnose the unit.
Other makes and models have a similar part, but it often goes by a different name. It might be called the “gem module”, “generic electronic control”, or “body control module.”
Automakers use this part to deliver complete system control to increase the vehicle’s fuel economy, reduce weight, and cut wiring costs.
Central Timer Module Tech Question
The central timer module helps control the taillights, headlights, when the dome lights come on, and several other functions on Dodge vehicles. When it doesn’t work correctly, the symptoms can be highly variable. The most common issue involves lights flickering or the relay switching on or off.
The primary tech question with the central timer module is if the issue is fixable at home, with a trusted mechanic, or by the dealership.
Unfortunately, the dealership is the only place where you can have the new one flashed to your vehicle. Although the cost is variable based on where you live, it’s typically about $500 to complete the repair.
When you schedule an appointment to address the central timer module issue, you’ll need to take all the key fobs in to ensure the programming takes place while you’re there. If you forget one, you’ll end up paying for another service appointment.
Even though the central timer module is only three screws with three-wire harnesses, the programming work is what you’re paying for with this repair.
You do have the option to buy a CTM independently to install it, but some things might not work until you purchase the dealership services.
If you buy a central timer module for your Dodge, it needs to come from a vehicle with the same all-power/loaded environment.
What Systems Does the Central Timer Module Control?
Each make and model is different, so an individualized list of every possible configuration isn’t practical.
For Dodge, Chrysler, and other brands, it sometimes even depends on the trim package selected.
Here is an overview of all the potential systems that the central timer module or its counterparts can control.
If you experience symptoms in any of these areas, it might be necessary to have your electronics tested and diagnosed.
| Battery Saver Functions | Cargo Lamps | Chime Warnings | Courtesy Lamps |
| Dome Lamps | Dome Defeat | Door Ajar Status | Fog Lamps |
| Headlamp Time Delay | Intermittent Wiper Controls | High/Low Beam Headlamps | Optical Horn |
| Parking Lamps | Central Locking – VTSS | Door Lock Inhibit | Driver Door Unlocking |
| Enhanced Accident and/or Collision Response | Power Door Locks | Remote Keyless Entry Features | Vehicle Theft Alarm – VTSS |
| Horn Chirp | Optical Chirp |
If you decide to proceed with a repair yourself, you’ll want to check that the digital bus didn’t short first.
Sometimes that can happen and put extra voltage in there that creates symptoms similar to a failure of the central timer module.
Two Versions Are Available for Some Vehicles
What makes CTM repair and replacement even more difficult from a DIY stance is the fact that some vehicles have two versions.
They’re typically referred to as the “base” and “highline” options.
The base option for the central timer module combines the functions of the buzzer and chime with an intermittent wiper in a single unit.
It also takes inputs from door ajar switches, the headlight switch, and the ignition to control the dome lamp circuit output.
That lets the base module provide load shedding that protects the battery from becoming prematurely discharged.
The highline version of the CTM is only used on that vehicle option. It provides the same functions as the base unit with the added tasks of controlling and integrating many of the electronics.
It contains a central processing unit (CPU), interfacing with other modules within the data bus network.
Both versions support the intermittent and wipe-after wash features, but only the highline version offers a speed-sensitive intermittent wipe.
Each CTM is programmed to energize or de-energize relays in response to specific inputs from the compatible switches.
What Could Be Causing My Headlights to Flicker?
The problem with the central timer module malfunction is that the symptoms can be variable and unpredictable.
You might be okay living without having variable speed wipers or automatic control of the dome light, but what happens when the headlights flicker?
Before replacing the central timer module for flickering headlights, it helps to run through the possible checklist of problems that can cause this issue
You can have a diagnostic test run to determine the cause with newer models. For older vehicles, it might be necessary to pay attention to the specific signs and symptoms your vehicle offers.
1. Dying Battery
One of the most common issues that cause the headlights to flicker is a battery that no longer supplies enough power.
Most shops provide a free inspection to help you determine if this problem is the cause of your vehicle’s issue.
If your battery is found to be at fault, the way to fix the issue is to replace it. With the right tools, most drivers can complete this job in about 30 minutes.
Most batteries last for three to five years. If you left your vehicle parked for a long time, take frequent short trips, or have lots of aftermarket electronics installed, that time could be cut in half.
Living in hot or cold climates can also decrease the battery’s lifespan.
2. Alternator Failure
When the alternator stops working correctly, the vehicle’s electrical output is directly affected by the malfunction.
This issue often results in dimming, flickering, or inoperable headlights. It doesn’t take long for the electrical system to drain the battery, which often leads to operational failure.
Since the alternator is responsible for charging the battery, you won’t experience any recovery while driving.
The only way to manage this situation while on the road is to limit electronics use. Replacing the battery if it fails will not correct the problem. You’ll need another alternator.
3. Headlight Burnout
Headlights work a lot like the lights you have at home. Once they reach their expected lifespan, the product can start flickering, dimming, or not working.
This fix is usually the easiest one for this problem. You’ll need to purchase the correct part for your make and model for it to work correctly.
Some bulbs receive damage or experience flooding, causing them to prematurely fail. You might need to clean out the lamp before completing this repair to ensure it provides long-term results.
4. Loose Connections
When a headlight starts flickering, there might be a loose connection with one of the wires or the fuse.
You typically see the symptoms of this problem when driving on rough or bumpy surfaces, such as a gravel street or a brick road.
The loose connection or unseated fuse can be a little tricky to find. If you’ve checked everything without success, an auto shop with electronics expertise can help you find and correct the problem.
5. Malfunctioning Wiring
Headlights can sometimes start flickering because something happens to the wiring. It can happen because of physical damage, a short that melts part of the product, or a faulty connection at the bulb.
Some drivers have found that the wires can start pulling out of the rear of the connector to create problems that replicate the issues a central timer module can cause.
In this situation, it might be necessary to replace or repair the damaged components. Addressing this problem may involve disconnecting electrical parts, especially if a shorted wire is involved.
6. Faulty Switch
When the computer and electric systems are speaking with each other, the result can cause the headlights to flicker.
This issue gets tricky because you might have a faulty switch and a problem with the central timer module.
It helps to have the suspected relays, fuses, switches, and other components tested individually if other diagnostic efforts have come back unsuccessfully.
What Happens If I Turn Off the Central Timer Module?
When you have multiple symptoms of CTM malfunction or failure, it might be tempting to turn off the switch to gain functionality for the vehicle.
Unless you’re familiar with working on your car, that action is not recommended. There is the potential risk of having the airbag accidentally discharge. If you’re in the way when that happens, a significant injury might occur.
The best option for a repair with a confirmed CTM issue is to have the vehicle driven or towed to your local dealership.
Once the part is replaced and programmed successfully, your car will have complete functionality restored.
How Can I Tell If My CTM Failed?
When drivers have multiple malfunctions related to their switches, lights, and wipers, it is often due to a failure of the central timer module. Since this issue can impact safety, it is recommended that the vehicle be towed to the dealership or an authorized mechanic for replacement and reprogramming.
When CTMs were rarely included with vehicles, I had a problem with our Chevy Cavalier that no one could figure out. It was stalling, had the incorrect idle speed, and sometimes the engine wouldn’t start.
After spending a small fortune on diagnostics, I had no cash left to pay for a possible repair. I happened to be talking to a friend who suggested that I unplug the manifold absolute pressure (MAP) sensor.
The wiring was right on the front of the engine. I pulled the plug.
Instead of running sloppy or hesitating for a couple of seconds, it started operating normally again.
I was told that my gas mileage would be terrible, but the repair to get vacuum to it would probably cost more than the vehicle was worth.
The symptoms I saw during that experience are similar to what happened when my Dodge malfunctioned the other day.
After thinking about the MAP sensor, I realized the issue was likely the central timer module because relays and light issues were happening simultaneously.
Although completing this repair happens at the dealership, knowing that you’ve found the problem still feels good.
I know I spend a lot of time in my car, like many others. The anxiety that comes when you don’t know can be overwhelming at times.
The good news is that once the CTM gets replaced and reprogrammed, the vehicle should run as it did before.