NO Bus warning turned on and wipers stopped working

Hi,

The idea that a NO BUS is turning on leads me to believe it has to do with the LIN (local interconnect network) system. This system runs at a much slower speed and on Chrysler products are commonly used for components such as the wipers.

I attached a wiring schematic below for you to reference. I highlighted the LIN and wiper switch. What I suspect is a breakdown between the switch, instrument cluster, and tipm.

You can try to trace the white wire with a green tracer to see if there is damage or an open circuit or you can have the can-bus system scanned for diagnostic codes. You can't scan the LIN network, but the CAN (controller area network) will identify issues within the LIN.

Here is a video showing how it's done:

https://youtu.be/InIlnsjOVFA

This is where I would recommend starting to see if there is a code that will point us in the right direction.

If you want to check the wiring, here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

I realize this may be confusing, but if there is a code stored, it should point us in the right direction.

Let me know.

Joe

See pics below.

Hi,

Yes, anything can be possible. However, without following through with the CAN scan, it becomes a guessing game. In this case, it can become an expensive guessing game. LOL That's what I'm trying to prevent.

Let me know.

Joe

Hi,

Are you referring to the blower motor fan in the vehicle or the radiator cooling fan?

Here is what I have experienced with a TIPM. Because there are so many tiny pins in each connector, they are prone to fail. Oftentimes, the pin in the connector will first corrode and then break. If they corrode and do not break, I have had situations where I would see 12v at a component until it was turned on and a load placed on the circuit. Then power would drop off. Since the blower (whichever one it is) worked and then stopped, that is where I would think that problem lies.

As far as the dealer, I would think they can scan the can-bus. If they can't, I would really be surprised. Call and ask them. Also, mention that you are wondering if the issue could be related to the LIN network which actuates the wiper motor. That network (LIN) can be checked via the can-bus.

However, if you want, I will explain how to determine if my theory is correct with the wiper motor. If you have a multimeter or voltmeter, do this.

First, locate the front wiper motor and disconnect the black connector to it. It should have 4 wires to it. See pic 1 below. Disconnect the connector.

According to the dealership, there is power present, but it won't work unless they jump power to it. So, we are going to determine if the power drops off when a load is placed on it.

Next, look at pic 2 below. It is what the plug looks like. I highlighted one connector and circled the other. Their purposes are listed at the bottom of the pic. With the plug disconnected, have a helper turn the wipers on low. You should get power to the number 5 pin. Then have them turn it on high and you should have power to pin 3.

One last check with it disconnected is the ground. Pin 4 leads to a black wire which provides a ground. Using your meter, check for continuity to ground.

If you find power and ground, reconnect the connector to the wiper motor. Now, take a paper clip or the probe on your meter and slide it into the rear of the connector making contact with one of the wires for pin 3 or 5. See if the voltage drops off when the wipers are turned on. If it does, suspect a problem with a poor connection at the TIPM.

Pic 3 below shows the wiring schematic I am basing this on and how the tipm sends power to the motor. Now, if there is no power to the motor regardless of connected or not, then we either have a bad ground (which I circled in pic 3), a fault in the LIN/CAN, or an open circuit between the TIPM and the motor.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

I added that link simply because I don't know what you are doing. Also, I'm here to help if you are not comfortable doing this.

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below.

Hi,

That is tied into the TIPM as well. Have you re-inspected the connectors? Also, if you disconnect the temperature sensor, does the fan run?

I attached the wiring schematic below for the cooling fans. Have you checked the fuse in the TIPM as well as the relay? If you haven't, I would suggest that first. If you already checked and they are good, we need to go back to the connectors at the TIPM.

Here are two links you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

When checking the fuse, make sure to also confirm there is power to it and from it as described in the link.

Let me know. Also, let me know if the TIPM is new or remanufactured.

Take care,

Joe

Hi,

You are very welcome. I'm glad to hear it's fixed. Also, thanks for letting me know the fix. Chances are it will help others in the future.

Please feel free to come back anytime in the future. You are always welcome here.

Take care,

Joe

Hi,

I would be happy to help, but I have to ask if you would please start a new thread specific to this issue. We try to keep them specific to one type of problem, so the threads are more helpful to others. I hope you understand.

Here is the link to start one:

https://www.2carpros.com/questions/new

I will watch for your question. Simply copy and paste it. Again, I hope you understand.

Take care,

Joe