All warning lights come on when rainy weather

When it’s raining or when I’m driving on a wet road, all the lights on my dashboard light up, including the engine, oil, handbrake, etc. The car was damaged by rats, but I had the harness replaced. After the harness replacement, I have driven approximately 24,800 miles. Now, the dealership wants to replace all of the wiring; however, I think that it is only one area of the wiring that has gotten wet. Do you agree with them that all of the wiring should be replaced, or can I consider only part of the wiring for repair?
Experienced mechanics share their insights in answering this question :
Hello. This is a water intrusion problem. It sounds like when they installed the harness that something did not get sealed correctly. Most of the time, it is the wiring where it goes into the control module. They need to recheck this for you and repair it since they seemingly did not do it right the first time. If you would like a second opinion on this or do not feel comfortable taking this back to the dealer, a certified technician from YourMechanic can come to your car’s location to diagnose the electrical system and let you know what needs to be done.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

When all your dashboard lights turn on at once, it most commonly indicates an issue with the alternator or the charging system. It is common for all the dash lights to come on with no alternator output; low voltage can cause unusual electrical issues. The alternator should be tested at the time of battery replacement.
Most likely, flickering dash lights are due to problems with the alternator. In addition to recharging the battery, the alternator is in control of running the electrical components in your vehicle. If the alternator is failing, it may not be able to steadily supply enough current to all the components.
The check engine light is usually the most serious and feared warning because of the kind of damage it can signal. This warning often indicates the potential for serious engine damage. When ignored, your vehicle could suffer from a blown head gasket or a seized engine.
If you notice your CEL coming on every time it rains, this means the moisture from rain is interfering with your engine parts. Inspect the spark plugs and all their wires and replace them if they`re overdue. Also, inspect the ignition coils and replace them as well if they`re problematic.
The first thing you can try, to turn off the car, then restart the engine. The second step is to disconnect your battery, wait for a few minutes then reconnect the battery. Another option is to continue to drive your car, and hope the light will reset itself.
It works in the same way: an amber light warns of a problem with the electrical system, which could include the batteries, motors or wiring, a red light indicates a more serious fault, so the car may shut down or operate with reduced power.
Green or blue lights simply let you know that a system is on or operating. Orange/yellow warning lights generally signify that your vehicle needs to be serviced or repaired soon. These warnings are less urgent than if you have a red and/or flashing light. A red light means that you should take action immediately!
There are two main types of dashboard warning lights: red and orange. A red warning light generally indicates a serious issue with your car. You should act quickly if your dashboard warning light is red – it could be an overheating engine, low engine oil pressure or a braking system problem.
If all of your lights have come on then that may be an indicator of some sort of serious malfunction with the vehicle. The fact that it appears to be running fine is a good sign. However, I would refrain from driving it until you can figure out what the issue is.
Can you drive a car with the engine light on? It`s okay to drive for a few miles, but be sure to schedule an inspection of the engine as soon as possible. If the check engine light comes on while you`re driving, don`t panic! Pay attention and see if the car is driving any differently than normal.
Occasionally, the check engine light can be triggered by environmental factors, like changes in humidity or extreme temperatures. If the light comes on briefly and goes away after an extreme change in weather, it`s probably nothing to worry about.
These problems can range from faults within the electrical system, the engine, fluid levels or to problems within the car`s emissions system. The problem can even be as simple as forgetting to tighten your gas cap – in fact, this is the most common reason why check engine lights appear in the first place.
2) Turn Your Car On and Off

Doing this will cause most vehicles to reset the trouble codes and the check engine light will turn off. Most vehicles will activate this restart process after turning the car on and off about three times.

What does Engine Immobiliser Warning Light mean? The immobilizer/key symbol indicates that the car is not able to recognize its keys. Sometimes, it could turn on due to some other problems with the immobilizer system.
Most modern cars have a dash light that indicates that the anti-theft system has been triggered. The icon for the anti-theft system looks like a car and a lock combination. When this light is on and flashing (it will be either or blue), it will indicate that your car`s anti-theft system is activated.
There are 3 different categories of warning lights; red, amber and green: Red warning lights mean you should stop the car as soon as it`s safe. Yellow warning lights mean that action is required. Green warning lights are for information only.
Most of the time, it is caused by the yaw sensor or the steering angle sensor. If you want to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to determine the cause of the Warning Lights and let you know what needs repair.
Automatic Emergency Braking (AEB) System– This light resembles two cars crashing head-on with each other. This light will briefly illuminate when the car starts, and tells you when the AEB system is set to OFF on the vehicle information display.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

No dash lights, back right tail light is out, no parking lights. Brake lights work though as does head lights.
ANSWER : Hi there. In many cases, when you have electrical problems like you’re describing, it’s caused by multiple electrical component failure. It’s likely that a few electrical relays are not working; especially if you have systems that utilize the same components (such as your brake light and tail lights). I would recommend having a professional mobile mechanic come to your location to complete an electrical problems inspection first, so they can pinpoint what is damaged and recommend the right repairs.

Low coolant light comes on when AC, defrost or heater is on, but only if the car is in gear and stopped, what’s wrong with my car?
ANSWER : First, you want to make sure your cooling system is full. Check the radiator not the coolant jug. And check it when it is cold. If it needs coolant, add some. Of course, I don’t feel this problem is an actual low coolant condition. I would expect to find an electrical failure in the instrument cluster or from a component or wiring harness that is connected to the instrument cluster.

As a technician, I have access to reports from technicians across the country. I could not find any reports of this problem, so diagnosing this will require an experienced tech as this is not a common problem. In addition, this happens at intermittent times making it difficult to recreate. The most challenging part of this diagnosis will be recreating the symptom. I suspect it has something to do with the brake switch circuitry because it only seems to happen when you have your foot on the brake. I would begin my diagnosis there with a wiring diagram and test light in hand. The brake switch, instrument cluster, and environmental controls all interact with each other. Something is crossed either because of a failed module or damaged wiring in a harness.

Aside from making sure the coolant is full, this will not likely leave you on the side of the road. If you take it in to be diagnosed, be prepared for them to spend more time than usual to figure it out. Since it isn’t a key problem, you may need to live with it until it completely fails making it much easier to diagnose. Either way, I do recommend having a certified mechanic diagnose the warning light to make sure there isn’t anything serious going on.

Good luck.

Battery light goes on when I start car then turns off, if I rev engine light comes back until rpms go down. Abs goes comes on/off
ANSWER : Batteries can die due to faults in the charging system so ideally a suspected "faulty" battery should be load tested before a decision is made to condemn it. The only exception to this rule is if the battery is already clearly "old" (greater than 5 years) but even then once you put a new battery in, as a replacement for a "dead" battery, you have to comprehensively check out the charging system. Diagnostic Trouble Code P0460 will result in disruption of the dashboard fuel gauge’s ability to accurately report your tank’s fuel levels. The fuel gauge readings may be erratic, or read somewhere off scale. Vehicles equipped with a low fuel warning light feature may also suffer from erratic low fuel warnings in the event of a code P0460. Unless the P0460 code has been reported alongside other trouble code, all of the vehicle’s essential systems should otherwise function normally. I would recommend that you request a check engine light diagnostic to first resolve the fault causing the P0460 code to set. The check gas cap light warning light could be due a faulty gas cap and/or small leaks in the EVAP system.

voltage warning light still coming on 30-45 seconds after car starts.
ANSWER : Nothing should be replaced until you have in hand a definitive diagnostic pinpointing the faulty segment of the car’s electrical system. There may be too much voltage drop in the charging circuit, as well as elsewhere, but start with the charging circuit. The faulty segment could be anywhere, so using the factory wiring diagram you just have to methodically and systematically test the entire charging circuit until the fault is found. It’s laborious but compared to replacing parts that might be perfectly good, properly diagnosing the fault will save you money and time in the end. As far as the engine warning light, at the moment I would fix the issue with the charging system first because that may resolve the check engine light. If it doesn’t, just request a check engine light diagnostic. If you want the charging circuit diagnostic steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a charging circuit diagnostic and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Dashboard warning lights come on during acceleration
ANSWER : Hello. Thanks for writing in about your Infiniti EX35. It sounds like one of your sensors for the system is reading incorrectly. I usually check the tires first as an odd tire on the car will cause this. If the tires are fine, then a scan tool would need to be used to see what the other sensors are reading. Most of the time, it is caused by the yaw sensor or the steering angle sensor. If you want to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to determine the cause of the Warning Lights and let you know what needs repair.

Rear brake light, and some interior lights don’t come on unless I’m braking
ANSWER : Hello. Replacing the stop light socket with a new one should have solved the intermittent problem of the stop light not working all of the time. It is possible that when you tweaked the socket, it caused a short to ground. This could explain why the dash lights only come on when you press the brakes.

The first thing that I would suggest is that the stop light socket be replaced. After replacing the stop light socket, if the dash lights still only come on when you press the brake pedal, the wiring for the dashboard will need to be inspected for any shorts to ground or bare wires touching metal that it shouldn’t touch. Since this issue started as a rear light problem, I would start with having your rear lights inspected by a certified technician, such as one from YourMechanic.

Abs light, emergency brake light, steering wheel assist light, engine light, EPC light, traction control light
ANSWER : Hello, thank you for writing in. The vehicle does utilize a lot of the same sensors for these systems. Are there any other codes that are coming up when this code appears? If so you will want to take these into consideration when processing the repair and making a diagnosis. The module may be bad, and replacing it should fix the problem. The lights should turn off once the main computer recognizes the new module and the sensors sync up. If you believe the sensors need to be cleaned you may do so. Do as minimal as possible to make sure you are not damaging the sensor or disrupting the wiring inside. A bad connection would make the lights stay on. With so many lights that are effected by the module being illuminated, the module is likely bad or does not have a connection. Check the connection first and then resort to replacing the unit. For more help with these electrical tests, contact our service department.

Engine Light and AT light. Car goes into limp mode
ANSWER : Hello. Most of the time this is the result of a transmission failure. It is common for this transmission to have internal pressure problem which will cause these codes. It can also be a voltage problem so I always check that first. I check the voltage going to the transmission and if it is too low I repair that issue which is commonly the ignition switch. If the voltage is fine, then the transmission pressures need to be checked and it will more than likely need to be replaced. I would have a transmission specialist look into this.