How to test the Signal Conditioning Module in a Ford Ranger/Everest Wiring Kit

This information is applicable to the following Tow-Pro Electric Brake Controllers using a Ford Ranger/Everest Wiring Kit:

Tow-Pro Elite V2 (EBRH-ACCV2)
Tow-Pro Elite V3 (EBRH-ACCV3)
Ford Ranger/Everest Wiring Kit (TPWKIT-012)

TOOLS REQUIRED:

Multimeter with a diode test function

WHEN WOULD I NEED TO TEST THE SIGNAL CONDITIONING MODULE?

If your vehicle has the TPWKIT-012 installed and you are experiencing some or all of the listed issues when no trailer is attached, it could result in a wiring issue or damaged Signal Conditioning Module.

Possible vehicle symptoms:

Trailer warning lamp on with no trailer detected
Dashboard indicator pilot light flash at a faster rate
Logged fault codes relating to brake light circuit
Reverse sensor/alarm does not operate
Reverse guidance/camera does not function correctly

HOW TO TEST THE SIGNAL CONDITIONING MODULE?

To test the Signal Conditioning Module, it will require diagnostic testing. REDARC recommends seeking the support of an installer where possible, however please see the diagnostic steps below.

TESTING THE SIGNAL CONDITIONING MODULE

Once you have confirmed that any of the issues listed above are occurring, prior to testing the Signal Condition Module check the following:

Ensure the Ford Ranger/Everest Wiring Kit (TPWKIT-012) was used.
Review User Manual.
Confirm installation is correct.
Review wiring, looking for damaged or squashed wiring harness or visible damage.

If everything looks okay refer to the next test.

Disconnect the Signal Conditioning Module from the TPWKIT-012 wiring harness, then using a multimeter, refer to the following test procedure:

1. Using a multimeter with a diode test function, set to the diode test.

Note, most multimeters will require you to select it and press a mode button.

2. Connect the multimeter positive lead (red) into the pin labelled Vehicle Pin and negative lead (black) into the Pin labelled Tow-Pro (indicated on the Signal Conditioning Module). It should read open circuit (OL or OC).

3. Connect the multimeter negative lead (black) to the Vehicle Pin and the positive lead (red) to the Tow-Pro Pin (indicated on the Signal Conditioning Module). It should read a voltage approx. 0.4V.

4. If the outcomes listed in steps 2 & 3 are confirmed, this indicated that the signal conditioning module is working correctly and is not the cause of the symptom.

5. If the outcome from the testing result in step 3 results in short circuit or open circuit, this indicates that the Signal Conditioning Module is faulty and needs replacing.

If you reach step 4 & 5 and are unable to trace or address the issue, further diagnostic testing is required by a specialist and REDARC recommends seeking the support of an installer.