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Unread 12-14-2014, 03:12 PM   #1
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Location: Gloucester, MA
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Rear Light Issues

Hey all,

My dad has a 2010 Jeep Commander that I am helping him sort issues out with.

As I understand, there are two brake light bulbs per housing, and each is a double filament bulb so that when the headlights are on they are at low brightness and when the brake is depressed they are high brightness.

The third tail light works fine.

The top bulb on LH and RH assembly works when the brake pedal is depressed, but not the bottom bulbs on each assembly.

When the brake light is not depressed but the headlights are on, the low light filaments in both RH brake bulbs work, but nothing lights up on the left hand assembly.

In addition, the reverse lights on both LH and RH assemblies do not work.

I replaced all 6 bulbs today with no change. What gives?


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Unread 12-14-2014, 04:09 PM   #2
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Were the bulbs themselves actually bad?
The bottom if I remember correctly are turn signals (someone correct me if I am wrong please)
Check the fuses and go from there.
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Unread 12-14-2014, 04:45 PM   #3
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Upon visual inspection the fuses look fine. Tomorrow I will try swapping out with a spare to see if it fixes anything but I doubt it is the fuses anyway as some of the lights work. I checked the three red 10 amp ones in the forward most box under the hood.

I replaced the bulbs without checking the previous bulbs, I assumed bulbs were the problem
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Unread 12-15-2014, 04:37 AM   #4
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When you have symptoms like your rear lights, its often a grounding problem. When one circuit is off then the other lights work because the current can flow to ground thru the unused circuit. If both circuits (brake and tail) are on and the ground is bad then it no longer has a path to ground. You will need to look for damaged wires, dirty connectors, loose ground wires etc.

FYI the tail lights have separate fuses for left and right plus a relay in the underhood fuse box. Here is a link that may be helpful
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