If the Tow-Pro shows a yellow light with two consecutive purple flashes, it means the unit has detected an inadequate connection between the Tow-Pro main unit and the trailer’s braking system.
This fault is usually caused by dirty, corroded, or bent pins on the trailer plug or base, loose or disconnected wires in the plug or base, or poor connections within the trailer’s electric brake wiring.
Fixing the issue involves inspecting and cleaning the pins, checking all wiring connections, and repairing or resoldering any faulty connections to ensure a solid link between the Tow-Pro unit and the trailer brakes.
REDARC recommends seeking the support of a qualified auto electrician or technician.
Important
For your safety, REDARC recommends installation by a qualified auto electrician or technician. Our trusted REDNetwork is made up of professional auto electrical businesses certified by REDARC to install the complete of REDARC solutions. Find Your Local Installer
This information is applicable to the following Tow-Pro Electric Brake Controllers:
- Tow-Pro Elite V2 (EBRH-ACCV2)
- Tow-Pro Elite V3 (EBRH-ACCV3, EBRH-ACCV3-NA)
- Tow-Pro Classic (EBRHV2)
- Tow-Pro Liberty (EBRH-ACCNA, North America only)
How will this appear?
The Tow-Pro remote head will display a yellow light with two consecutive flashes of purple.
Check out our handy video troubleshooting guide or keep reading for full troubleshooting instructions.
What does yellow and two purple flashes mean?
This flash code means that there is an inadequate connection between the Tow-Pro main unit and the trailer’s braking system.
Can I still tow with this fault?
Whist the Tow-Pro will attempt to brake the trailer, the braking performance will be affected. It is recommended to avoid towing until the fault can be rectified.
What causes the yellow and two purple flashing fault?
This fault is indicating the Tow-Pro is sensing a connection to a trailer braking system however the connection is poor.
How to determine the cause of this fault?
Below is a list of the common causes and repairs.
Important
In this article we explain the need for testing to determine the cause of the issue. Testing may involve changes to the installation or wiring. For your safety and accuracy, REDARC recommends engaging a REDNetwork member or a suitably qualified auto electrician - Find Your Local Installer
A. Dirty, corroded or under tensioned pins on trailer plug (trailer) and base (vehicle)
- Ensure pins are clean and not bent inwards (male pins on the trailer side of the plug).
- Use a product such as RP7 or WD40 to clean the pins if corroded dirty and use a small flat blade screwdriver to help straighten any bent pins.
- Re-connect the trailer plug to base and check to see if fault code is still being displayed.
B. Loose or disconnected wires in the trailer plug (trailer) and trailer base (vehicle)
- Remove the covers from both the plug and the base to facilitate access. If necessary, detach the trailer base from its vehicle mount.
- Carefully inspect all the wiring to confirm that the wires are clean and securely fastened beneath the connection screws.
- Pay particular attention to pin 5 (Blue Output Wire that connects the Tow-Pro unit to the trailer electric brakes) and pin 3 (earth pin).
- Re-assemble covers and refit base to vehicle, connect trailer plug to base and check for Tow-Pro remote LED activation.
C. Poor connection of electric brake wiring in the trailer
The electric brake wire originates from pin 5 of the trailer plug and extends to each individual brake on the trailer's wheels. This involves connecting one wire to multiple points, which can be achieved through soldering or the use of a connection terminal or block.
- Trace the wiring from the trailer's electric brakes (wires emerging from the brake drums) by working backward to locate the connection point. This might entail removing any insulating sleeving or tape.
- Examine for indications of an inadequate connection, such as corrosion or poorly executed soldering.
- If necessary, eliminate the problematic connection point and re-establish the connection either by soldering or using a new connection block.
- If required re-insulated wiring with tape or heat shrink and check if fault code is still being displayed.
