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2004 Prius Stoplight

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Posted by NeoPhyte.Rep on May 25, 2009, 3:54 pm
 
The right side stoplight of my 2004 Prius has ceased functioning.
THis is not the taillight, the backup light, or the turn signal light,
all of which are easily removable and replaceable.  This is the LED
array in the top triangle of the fixture.

The mechanic with all the certifications up his sleeve told me this is
the first he has seen and, initially, did not know how to replace it.
He promised to order a part and the Service Writer would get back to
me.  That was a week ago.  I guess I'll have to go see what happened
to my order.

Posted by Was Istoben on May 25, 2009, 6:37 pm
 


Hard to picture an array of LEDs failing given their theoretically infinite
life.  I'd look for something else in that circuit, most likely a loose or
corroded connection.  The array itself can be tested with any cheap
ohmmeter.  It should present the classical diode's large front-to-back
resistance ratio.  Set the ohmmeter on a low scale.  You should low a
resistance with the probes one way, very high resistance with the probes
reversed.

The wiring harness is located inside the hatch and accessible through a
pull-off door just behind the tail lamp assembly.  Were it me, my first step
would be setting up the condition that normally lights the array and then
wigging the harness, a variation of what we call "percussive maintenance."


Posted by NeoPhyte.Rep on May 26, 2009, 5:26 pm
 
The harness you see inside that hatch provides power and control to
the taillight, the reverse light and the turning indicator; not the
LED array.  If anyone knows where the connection for the LED array
really is, I'd appreciate your information.  It currently appears it
is buried somewhere behind the assembly, which must be removed to gain
access to any LED harness.


I agree the whole array ceasing to function was a major surprise.
That's why I am here looking for others with the same experience and,
perhaps, knowledge of what was done to remedy the situation.

Posted by Was Istoben on May 26, 2009, 6:14 pm
 

The harness you see inside that hatch provides power and control to
the taillight, the reverse light and the turning indicator; not the
LED array.  If anyone knows where the connection for the LED array
really is, I'd appreciate your information.  It currently appears it
is buried somewhere behind the assembly, which must be removed to gain
access to any LED harness.

I agree the whole array ceasing to function was a major surprise.
That's why I am here looking for others with the same experience and,
perhaps, knowledge of what was done to remedy the situation.

________

The connection to the LED array is, as you write, most likely internal to
the assembly.  Only a single wire is necessary since the array would most
likely used a shared ground connection.  I find it highly unlikely they
would run a harness from the dash all the way to the assembly but run this
one wire separately.  Are you certain this wire isn't in that harness?
Sorry, but I don't have the wiring diagram.



Posted by NeoPhyte.Rep on May 26, 2009, 10:53 pm
 
I don't need the wiring diagram; I've held the harness and it only
connects to three lamps, as previously described.

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