Our third Honda CR-V SUV rear light was on Today morning and it was on from yesterday around 6:30 pm. (checked camera) and the battery is completely dead and I will fix it Today.
[My Question]
Can a car rear light turns on by itself when the ignition is off?
[Google AI Answer]
Yes, a Honda CR-V’s rear light can turn on by itself with the ignition off due to electrical issues, such as a malfunctioning light switch, a faulty body control module (BCM), a stuck tail light relay, or problems with the wiring. A failing brake light switch can also cause brake lights to stay on continuously.
Potential Causes:
Faulty Light Switch:
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A common culprit is a worn or corroded multifunction light switch that incorrectly signals the lights to stay on.
Body Control Module (BCM):
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Issues with the BCM, such as a stuck relay within it, can lead to persistent tail lights, especially in older models.
Stuck Tail Light Relay:
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A relay in the tail light circuit could be stuck in the “on” position, keeping the lights illuminated.
Wiring Problems:
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Corroded connectors or damaged wiring to the tail lights can create a short circuit, causing the lights to activate unexpectedly.
Stuck Brake Light Switch:
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If the switch that activates the brake lights is damaged or stuck in the “on” position, the brake lights will remain on even when the vehicle is off.
What to Do:
1. Inspect the Light Switch:
Look for any signs of wear, corrosion, or damage to the multifunction light switch.
2. Check Fuses and Relays:
Inspect the tail light fuse and relay for any damage or signs of sticking.
3. Examine Wiring:
Check the wiring and connectors for the tail lights for any signs of corrosion or damage.
4. Test the Brake Light Switch:
A failing brake light switch is a common cause for brake lights staying on, so this component should be inspected.
5. Consult a Professional:
If you cannot identify the issue, or if you suspect a problem with the BCM, it is best to have a qualified technician diagnose and repair the problem.
