CTM Failure On Dodge
Multiple Electrical Problem on Dodge
I have a 2003 Dodge Dakota with a 3.9 engine. My SERVICE ENGINE LIGHT comes on dash, headlights turn on and I cant turn them off, windshield wipers only work on high, same with the air conditioning. Also four wheel drive switch does not light up but when I take battery cable off and put them back on. All starts working for awhile then again service light comes back on.
Troubleshooting:
As per problem described this is going to be a CTM failure.
The CTM, or Central Timer Module, is, to put it simply, the brain for the interior. It is the electrical hub for the entire interior now.
You can say when car body computers go bad.The strange interior behavior, instrument cluster or gauge failure, and other issues will be noticed.
WORKING OF CTM (CENTRAL TIMER MODULE)?
The CTM is what sends a wakeup message to the transfer case module when you start the truck. If it doesn't send this message then the module won't wake up, the instrument cluster sees that it's not communicating on the bus so the warning light comes on.
A FAULTY CTM ISSUES:
The CTM is responsible for interior lighting, exterior lighting and low speed/intermittent wiper functions. When the CTM goes down it can cause an array of different symptoms. I've seen them lock up where nothing works, things cycle on their own, or incorrect outputs come on when you command something else. On one such case we saw dome lamps flash in time when the turn signals are turned on.
This was all due to faulty CTM.
CTM Reset Procedure Helps?
Disconnecting the battery or the CTM itself will usually bring one back temporarily. With the symptoms you are having and the fact that they go away with a battery disconnect point to a definite CTM failure.
But if same problem again restarts then is faulty CTM.
CTM Location On Dodge Dakota?
Central Timer Module is located in the left kick panel, the panel to the left of the driver's floorboard. Remove the kick panel, unplug the CTM connectors and then remove the bolts that hold it.
PLEASE NOTE: If you have keyless entry the key fobs are programmed to the CTM, so when replacing it you'd lose keyless entry until the fobs are programmed. This will take a couple minutes and needs to be done with a DRBIII scan tool. If you buy the replacement CTM from a dealer you may be able to have them program your fobs for free. If not they shouldn't charge too much, basic dealer charges are approx $20 for programming fobs.
WHY CTM Programming Required For New Central Timer Module Unit?
These units come pre-programmed with the software.So No need to program the CTM if its new, but there are certain customer features that will need to be enabled as need. For instance, the remotes would need to be trained to the new CTM using only a scan tool, since there is no manual method of doing it.
If your vehicle has a factory alarm system, then that would need to be enabled, or turned on as well in the same manner.
Its suggested to buy new CTM unit instead of used modules, only because you have no idea what you are getting and whether it works correctly or not, so always buy new or re-manufactured when it comes to electronic modules.
As there is warranty for this products and failure rate is near to nil.
HOW TO TEST CTM?
First You will need a test light to test the CTM.
The tests below are to confirm the power and ground voltages for CTM.
These tests will verify that the power and ground supplies to the CTM are good.If they are, then it's highly likely that your looking at a CTM failure.
Once you get to the CTM behind the kick panel you'll see that it has 3 connectors (If there is only 2 then it's a base truck model).
The first one is #1 - it has 26 pins, the diagram attached shows the terminal end.
Hook your test light up between the battery positive and negative posts to make sure that it works, and to see how bright it should be with a good connection.
Testing Power To CTM:
First the power circuits.. I will also mention color codes of wires in pin.
pin 25 (dark blue with a white tracer) and pin 26 (dark blue). The test light should come on when the key is in the run position on both of these circuits.
Now Testing grounds Voltage To the CTM:
You have to connect your test light to battery positive, and make very sure you have the correct wires before testing.
pin 1 (either solid black, or black with a light green stripe) and pin 16 (black with a light green stripe). The test light should illuminate.. if it comes on but very dim (or doesn't come on at all) you have a ground problem.
Check CTM C3 Module Connections:
Next up is C3 it has 12 wires, but it'll be easier.
You just need to check for power on;
pin 1 (red with a tan stripe)
pin 6 (red with a light green stripe)
These will likely be OK as they are the main power supplies that the CTM uses to power up the left and right headlight bulbs.
This details will help.
Thanks.
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