Dash light on for rear bulb out, but all lights are OK

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#1
Make
Toyota
Model
Camry
Year
1999
Miles
278,000
Engine
4 cyl
Owner and I and 2 different mechanic have all checked the bulbs and agree all bulbs are working, including 3rd light.

So what triggers the dash light to go on besides a burned out bulb? Could some sensor be the problem?
 
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#2
Some versions have additional bulbs on trunk lid. If both are not working, that can fool you.

There may be a problem with "lamp outage module" behind trunk liner.

Having bulbs of the proper wattage may make a difference.

Viewing bulb brightness (at night) may show up a weak or missing ground circuit.
 
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#3
Thanks. He dos not care about the function of the device, just wants the light to go out on the dash. Can the module be disabled removed or eliminated. If so, how?
 
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#4
Owner and I and 2 different mechanic have all checked the bulbs and agree all bulbs are working, including 3rd light.

So what triggers the dash light to go on besides a burned out bulb? Could some sensor be the problem?
On the bulb side of the Light Failure Sensor find the junction box; I can't recall if it's on the trunk lid behind the tail light assemblies or on the back wall of the trunk - there might be two of them. I no longer have my FSM's to confirm.

Open the junction box and check the screw connections that hold the wires together. Most likely one of those screws is loose.

I owned an '87 Camry that had this same issue. I found a loose ground wire in this junction box. Don't reef on the screws; they're threaded into plastic.

HTH - Paul O.
 
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#5
UPDATE: Both license plate bulbs not lighting. Not sure if they are sensed or not. No one noticed that during previous inspections. One bulb burned out and one OK but neither working . Replaced both bulbs but determined that no 12 volts came to either socket.

Located the Brake Tail Light Failure Module Sensor Relay part # 89373-33180 ($300) in left quarter panel and opened it up but found only a seemingly good looking circuit board. I did not find any junction box to tighten screws like Paul O suggested.

I now suspect a broken wire from opening and closing the trunk for 20 years. Neither the owner or I am interested in tearing into that loom. We tried just eliminating the Module but that left us with no lights.

It now seems like running a 12 volt jumper wire from the tail lights to the lic plate lights would be the simplest solution. It may not turn off the dash light but would allow the lic plate lamps to go on with the tail lights.

Any more ideas??
 

billr

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#6
UPDATE: Both license plate bulbs not lighting. Not sure if they are sensed or not. No one noticed that during previous inspections. One bulb burned out and one OK but neither working . Replaced both bulbs but determined that no 12 volts came to either socket.

Located the Brake Tail Light Failure Module Sensor Relay part # 89373-33180 ($300) in left quarter panel and opened it up but found only a seemingly good looking circuit board. I did not find any junction box to tighten screws like Paul O suggested.

I now suspect a broken wire from opening and closing the trunk for 20 years. Neither the owner or I am interested in tearing into that loom. We tried just eliminating the Module but that left us with no lights.

It now seems like running a 12 volt jumper wire from the tail lights to the lic plate lights would be the simplest solution. It may not turn off the dash light but would allow the lic plate lamps to go on with the tail lights.

Any more ideas??
I'm confused, in reply #3 you indicated the dash light was the main issue:

"...just wants the light to go out on the dash." (be sure to "expand" the quote above"