Why is my Tow-Pro flashing yellow and four red?

This information is applicable to the following Tow-Pro Electric Brake Controllers:

• Tow-Pro Elite V2 (EBRH-ACCV2)

• Tow-Pro Elite V3 (EBRH-ACCV3)

• Tow-Pro Classic (EBRHV2)

HOW WILL THIS APPEAR?

The Tow-Pro remote head will display a yellow light with four consecutive flashes of red.

WHAT DOES YELLOW AND FOUR RED FLASHES MEAN?

This flash code indicates a fault where the Tow-Pro has detected that it has lost its connection to the vehicle’s ground circuit (earth).

WHAT IS THE VEHICLE'S GROUND (EARTH)?

The phrase “connection to the vehicle’s ground circuit” refers to establishing a connection with the negative terminal of the starting battery. To simplify the installation by minimizing the need for long wiring runs back to the starting battery’s negative terminal, the negative terminal of the starting battery is linked to both the vehicle’s body and engine. This wiring enables accessories like brake controllers to have their ground wires connected to the vehicle’s body.

WHAT CAUSES THE YELLOW AND FOUR RED FLASHES FAULT?

This fault relates to the ground (white) wire from the Tow-Pro main unit being disconnected or having lost connection to the vehicle’s ground. Typically, this connection is established using a crimped eyelet on the ground (white) wire, which is grounded to the vehicles body through a bolt.

To determine the cause of this fault, it will require diagnostic testing and REDARC recommends seeking the support of an installer where possible, however please see below a list of the common causes and repairs.

COMMON CAUSES OF THE FAULT

Poor connection between the Tow-Pro ground (white) wire and vehicles ground circuit could be caused by a painted surface, loose grounding bolt, bad eyelet crimp or bad solder joint (if applicable):

1. Locate the Tow Pro main unit under the dashboard and follow the white wire on the main 4 pin connector.
2. Trace the white wire from main unit to determine location of connection to vehicles ground.
3. Check connection point to ensure:
   • There is metal to metal contact between the vehicle ground and eyelet on the main unit ground (white) wire. If the connection is not metal to metal, you will need to remove some of the paint where the earth eyelet comes into contact with the vehicles body.

The eyelet is suitably crimped to the main unit ground (white) wire. Give the ground (white) wire a slight tug, you should not be able to pull the crimp off the wire.