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Old 12-15-2011, 07:43 AM
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svxcess svxcess is offline
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Join Date: Feb 2001
Location: Westminster, MD
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Re: "stop lamp" light

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The stop lamp checker is located in the right side in the trunk, behind the carpeted panel, in front of the rear washer fluid reservoir. The design and mounting is such that if water gets into this area the checker relay acts as a reservoir to collect and hold water.

Relay replacement is a simple 1 plug/ 1 screw operation.

Part No. 88081PA000 ...Cost of the part is about $36.74





Explanation of this circuit


The rear stop light sensor works by separating the stop lamps into two circuits, each with two bulbs. The two center panel lights are one circuit and the two outside lights are the other.

The two circuits each go into a sensor and each current draw is measured. If it is not in balance (ie, one circuit has two bulbs, the other only has one working) the "stop lamp" on the dash comes on.

The manual tells you the only "fooled" instance. If one bulb from the center panel is burned out and one bulb on an outer light is burned out, the "stop lamp" indicator will not come on.

It has a fail-safe provision so if all four bulbs are burned out (zero current flow) it triggers the light.

If you put higher wattage bulbs in the center panel but regular bulbs in the outer lights, the imbalance will trigger an indicator even though all four bulbs light.


UPDATE

If you replace your tail/brake lights with LEDs, the light will trigger because the LEDs use next to no current, so the sensor thinks all four bulbs are burned out.


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In-Service Date: January 2, 1997



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Last edited by svxcess; 03-09-2020 at 02:37 PM.
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