It's purpose is to "turn on the vehicle's interior lights" when you disarm / unlock the vehicle with the DEI Remotes. It works exactly the same as the newer factory keyless entry systems that turn on the interior light when you unlock the doors with the factory remotes. This enables you to see inside a "lighted vehicle' for safety, before you open the door and get in.

Most DEI Systems have a 200 mA Domelight Supervision Output wire. Typically it is the Primary Harness H1/4 Black/White output wire, but you need to verify this on the wiring diagram for your specific DEI system. It is designed to "activate" a relay, such as the DEI 8616 Mini-Relay. It is not designed to handle the amperage current flow of the interior lights on most vehicles, which is generally about 1 amp, and can be a much higher amperage for vehicles with several interior lights under-dash, on the doors, and a Domelight. Connecting the H1/4 Black/White 200 mA output wire to these vehicle's interior lights can overload the 200 mA circuit and damage the CPU. The proper and safe method is to use a DEI 8616 Mini-Relay to make this Domelight Output connection.

If the factory Domelight wire (or door trigger wire) in your vehicle is a (-) connection, then connect # 30 Yellow to (-) chassis ground. Then connect the # 87 Brown wire to your vehicle’s factory (-) Domelight wire or (-) door trigger wire.

If the factory Domelight wire (or door trigger wire) in your vehicle is a (+) connection, then connect # 30 Yellow to a constant + 12-volt source. Then connect the # 87 Brown wire to your vehicle's factory (+) Domelight wire or (+) door trigger wire.

# 87A Orange is not used for this particular application of the DEI 8616 Mini-Relay and should be cut-off and well taped to prevent any possible short.

That's it! You now have protected the CPU's 200 (-) 200 mA output against current overload.

Here are the wiring details for those of you who want or need more information:

First, verify that the DEI System's Domelight Supervision output is the Primary Harness H1/4 Black/White (-) 200 mA wire. (If not, locate it on the Install Guide's wiring diagrams for the specific DEI System you have.)

Here's the Primary Harness wiring diagram for the DEI Valet 562T Remote Starter for your reference;

The left side of the relay in the above schematic is the "activation" side of the relay. The relay is "activated" when # 86 Red is connected to +12-volts, and # 85 Black is connected to (-) chassis ground.

The right side of the relay in the above schematic is the "switching" side. When the relay is not activated, the internal switch connects the # 30 Yellow wire to the # 87A Orange wire. This is also known as the "normally closed" switch or circuit. When the relay is "activated", the internal switch disconnects the # 30 Yellow wire from # 87A Orange wire, and connects it to the # 87 Brown wire. The internal "switch" is very similar to the light switch on the wall in your home. We are using the relay to "switch" the Domelight on, in a manner similar to your "switching" the lights on in a room.

This "activated - switched" connection (# 30 Yellow - # 87 Brown) is the one we are going to use to turn on the Domelight in your vehicle.

Connect the DEI 8616 Mini-Relay's # 85 Black (-) Ground wire to the Primary Harness H1/4 Black/White (-) 200 mA Domelight Supervision Output wire. Then connect the DEI 8616 Mini-Relay's # 86 Red wire to a constant +12-volt source in your vehicle.

This completes the "activation" side of the relay. When the DEI Valet 562T's Primary Harness H1/4 Black/White (-) 200 mA Domelight Supervision Output wire "becomes a negative", it completes the + 12-volt circuit and "activates the relay", causing the internal switch to change from the # 30 Yellow - # 87A Orange wire connection to the # 30 Yellow - # 87 Brown wire connection.

The # 86 Red - # 85 Black coil side of the relay requires very little current and will not overload the H1/4 Black/White (-) 200 mA Domelight supervision Output circuit inside the DEI 562T CPU, thus protecting it from failure.

Now the factory Domelight (or door trigger circuit) in vehicles can be either a (-) polarity circuit, or a (+) polarity circuit. Refer to the DEI Vehicle Wiring Information sheet for your particular vehicle. The DEI 8616 Mini-Relay can be used either for a (-) polarity or for a (+) polarity Domelight circuit. You just connect the DEI 8616 # 30 Yellow wire to either (-) chassis ground, or to a constant (+) 12-volt source, depending on which polarity your vehicle's Domelight circuit is.

If the factory Domelight wire (or door trigger wire) in your vehicle is a (-) connection, then connect the # 30 Yellow wire to (-) chassis ground. Then connect the # 87 Brown wire to your vehicle's factory (-) Domelight wire or to the (-) door trigger wire. When the DEI 8616 Mini-Relay is "activated", the # 30 Yellow - # 87 Brown wire provides a (-) chassis ground to your vehicle's (-) Domelight circuit, causing your Domelight to turn on.

If the factory Domelight wire (or door trigger wire) in your vehicle is a (+) connection, then connect the # 30 Yellow wire to a constant + 12-volt source. Then connect the # 87 Brown wire to your vehicle's factory (+) Domelight wire or to the (+) door trigger wire. When the DEI 8616 Mini-Relay is "activated", the # 30 Yellow - # 87 Brown wire provides a constant (+) 12-volts to your vehicle"s (+) Domelight circuit, causing your Domelight to turn on.

# 87A Orange is not used for this particular Domelight Supervision application of the DEI 8616 Mini-Relay and should be cut-off and well taped to prevent any possible short.

That's it! You now have protected the CPU's 200 (-) 200 mA output against current overload.

We, Auto Preservers, provide similar Supplemental Installation Information to our customers for numerous other product installations and wiring connections for DEI products, such as for wiring a 2nd accessory remote start wire, power trunk release, hatch release, neutral safety switch input connections, factory power door locking system connections, diesel "wait-to-start" connections, DEI 555 Series Bypass Modules, DEI Interface Modules, remote start activation connections, etc.

Sorry, we are not able to provide Tech Support or provide our AP Supplemental Installation Information to non-customers. The company you purchased your DEI product from should provide that for you.

We look forward to being of service to you.