TF2218 Smart Seven Way Bypass

Smart7 Bypass: Microchip-controlled 7-lamp bypass

Truly rational switching on all circuits gets it right on every car.

The controller in this relay array interrogates the vehicle's lighting systems against exact criteria to get the switching right every time.   No chatter, no dim lights, just on and off as they should be. It even adjusts itself for negative switched cars. Bypasses all the vehicle's bulb-failure warning systems.

Added Value:

  • Monitors the trailer flashers with both a built-in audible output and terminal outputs for a remote sounder or warning lamp.
  • Totally transparent: the car does not detect it.
  • Fully snubbed against "spikes" and other hazards
  • Type-approved for EMC compliance
  • Protected: stands rough treatment, accidental current reversals, etc.
  • Future-proof: new in-vehicle scenarios will be accommodated rapidly.
  • Ready fitted with the new Multi-Splice connector.

Part number: TF2218

Refer to the General Instructions and Chart A in the section 12N Wiring before following these instructions.
Connect six of the 7-core wires according to the number and function codes marked on the printed circuit board and box. If you are fitting a relay pre-fitted with a Supersplice connector block, refer to the instructions with the relay.
Connect white to a good chassis earth.
Bring a reliable power line (2.0mm2) from the vehicle battery to terminals +12V Fuse close to the battery using a 15amp fuse. Do not insert the fuse until you are ready to test.
Do not connect to the battery or insert the fuses until the rest of the installation is complete.
2217diag
 
When the installation is complete, switch off all the car's lights and ignition. Make the battery connection, connect a light- board and insert the power fuse to test the relay. When you insert the fuse in the relay power feed, the relay will self-test. Finally, do the usual test of all the lights.
Installation essentials
Remember to use a suitable fuse to protect your power wire.
Put the fuse in the circuit as near to the battery as possible.

To calculate the correct fuse value, add together the combined wattage of the bulbs to be supplied (21 watts each for flashers, brakes and fogs, 5 watts each for tail lamps.). Divide the total by 12 to get the fuse rating required. Try to be as little over the calculated figure as possible. Do not just put a big fuse in: this may not give adequate protection to the circuit.

    TF2217U Smart7 Bypass
  

 

These notes refer to TF2217U only.

For troubleshooting the TF2217 plain, see the page for that relay

Symptom

Possible cause

Corrective action

Malfunction on some or all circuits

Failure to push the car loom wires into the SuperSplice connector properly

Push all loom wires   fully home into the SuperSplice receptacle

Car loom wires connected in wrong positions on SuperSplice receptacle

Check and correct connections

The numbers on the relay's SuperSplice terminal match the numbers on a 7-pin socket.

Plug forced into   SuperSplice receptacle upside down.

Insert correctly with receptacle's lugs against the plug side wall.

Reversal of 7-core wires into relay: if D and E   are reversed , the brake light will come on with the sidelights etc.

Reposition 7-core wires

Relay initially appears to fail

Any of above plus:

Car battery low

Car's own check systems alerted

Run the engine to charge up the battery and re test. Reset car's systems before powering the relay.

Buzzer screams continuously when unit is powered

The "-TT" terminal is wired to earth

  Disconnect terminal   "-TT" from earth

Relay "jams" leaving e.g one light on.

Can occur during fitting/ checking/ testing as relay gets mixed signals.

Remove fuse in power line to relay, switch off car lights. Leave a few minutes then restore fuse. Chip in relay should reset.

Rover 75

Relay appears to fail on fitting

Immediately after completing the installation and before powering and testing the relay, reset all the car's bulb-failure systems by switching every light on and off.

Vauxhall Vectra

10/15 second "tick" when vehicle off and number plate light still on

Relay reacting to car "check" signal.   Does not affect lights: stops when number plate lights go off.

Vauxhall Vectra

Brand new (unregistered?) car

Relay appears to malfunction

Check dealer has done a full pre-sale cpu download.

Complete the download to allow the relay to work properly. Retest.

 

   
Operation
A basic test to see if they are working properly is as follows.
Connect the power-in wire or terminal to a 12 volt source. Connect the earth wire to a reliable earth. Connect a bulb to each of the designated output wires or terminals in turn and touch the appropriate signal wire to the 12 volt source. The bulb should light.
Installation checks
That the power source is adequate and constant.
That all connections are good
That you have connected the correct wires and terminals together.
That the signal source is correct