So whether your brand calls it a Central Timer Module, body control module, gem module, know that it’s the computer that controls various features that used to be directly controlled by switches. In most cases, you’ll also have to reprogram your remote key fobs and keys. item 3 203 Dodge Dakota Body Control Central Timing Module Computer BCM CTM 203 Dodge Dakota Body Control Central Timing Module Computer BCM CTM 70.99 +9. You CANNOT take a BCM from a similar vehicle and slap it into yours. So make sure you check the condition of the connectors before replacing an expensive module.įinally, most BCMs must be programmed by the dealer or a shop equipped with the proper scan tool. Also, since the BCM relies on monitoring low voltage reference signals to the switches, any corrosion can also screw things up. That screws up all digital communications results in all kinds of crazy behavior. Sometimes a module on the bus can short and place voltage onto the bus. However, before you replace a BCM, make sure the digital bus isn’t shorted. The Central Timer Module is located behind the left side kick panel. In the case of Chrysler, and depending on the vehicle and trim package, the CTM can control the following systems:īattery Saver Functions For Exterior and Interior Lamps Chrysler calls theirs a Central Timer Module (CTM). Ford calls theirs a Generic Electronic Control (GEM) module. GM calls their BCM a body control module. The TIPM receives the signal and activates either an electro-mechanical relay or a solid state relay. In the case of Chrysler, the digital bus connects to the Integrated Power Module (IPM) or Totally Integrated Power Module (TIPM). Or, it can send a digital signal onto the digital bus. Depending on the level of digital complexity, the BCM can provide ground to the control coil on the headlight relay. The BCM sees the voltage drop to 0 or near zero (depending on how much voltage drop is in the circuit). When you turn the switch, it grounds the reference signal. Want to turn on your headlights? The switch gets a low voltage reference voltage from a body control module (BCM). In a digital vehicle, switches are nothing more than signal inputs to a computer. To understand how the system works, take everything you know about switches and wiring and throw it out the window. It’s an effort to reduce wiring costs and complexity, reduce weight, and have complete control over all systems to further increase MPG. Every car maker is switching to digital controls for almost all vehicle functions. Central Timer Module, body control module, gem module. These computers are known by several different names. Make and Model > Chrysler > Central Timer Module, body control module, gem module Central Timer Module, body control module, gem module What the heck is a Central Timer Module, body control module, gem moduleĪs I read auto forums I constantly hear people asking what a body control module does, where it’s located and how to fix it.
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