Why is my Tow-Pro flashing blue?

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 consecutive blue flashing.

WHAT DOES BLUE FLASHING MEAN?

This flash code indicates when the Tow-Pro remote head has detected a fault mode from one of three possible causes:

• Tow-Pro brake trigger wire (red) has a continuous low voltage.
• Tow-Pro supply power is not stable.
• Tow-Pro remote head cable is damaged.

HOW TO DETERMINE THE CAUSE OF THIS FAULT?

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.

To identify the source of the blue flashing, it is recommended to follow this process, as there are three distinct factors that could be responsible.

1. Tow-Pro brake trigger wire (red) has a continous voltage

The Tow-Pro brake trigger wire (red) is connected to the vehicle’s brake light circuit and should receive battery voltage (approximately 12-14 volts) when the brakes are applied and 0 volts when the brakes are not applied. If there is any continuous low residual voltage present, this fault will be triggered.

Locate the Tow-Pro main unit under the dashboard and connect your voltmeter lead between the red and white wires on the main 4 pin connector.

1. This can be achieved by back-probing into the connector.
2. With the vehicle ignition ON (vehicle not running) check the voltage when brakes are OFF and ON.
3. If there is any residual voltage when brakes are not applied, an alternate brake trigger source will need to be located, please refer to your closest installer.
4. If the voltage is within the following specifications this is not the cause of fault, please refer to the second test process.

2. Tow-Pro supply power is not stable

The Tow-Pro is connected to battery power through the black (positive) and white (ground) in the 4-pin connector, and has an operating range of 9-32 volts, however if this voltage is unstable (fluctuating), this fault may be triggered.

1. Locate the Tow Pro module under the dashboard and connect your voltmeter lead between the black and white wires on the main 4 pin connector. Note: The main 4 Pin connector must stay connected to the Tow-Pro Module throughout this test.
2. With the vehicle running, check the voltage to ensure it remains stable.
3. If the voltage is fluctuating either the black or white wire connections will require further assessment, please refer to your closest installer.
4. If the voltage remains consistent, this is not the cause of the fault code, please refer to the third test process.

3. Damage to Tow-Pro remote head cable

The Tow-Pro remote head cable links the Tow-Pro remote head to the main unit, and any harm to this cable can lead to this issue.

1. A physical fault in the cable might be spotted through a visual examination, but internal damage may remain concealed.
2. If a visual inspection does not reveal any faults and tests confirm that causes 1 and 2 are not the problem, it's advisable to replace the remote head cable.