User's Manual

30
SECTION D: TROUBLESHOOTING THE
POWER SUPPLY
Turn off the power to the module,
disconnectthe18-pinECU
connector.
Checkforhighresistance
(corrosion, wire/connector damage
or improper termination) of the
power lines, resulting in a high
voltage drop across the lines.
Measure the voltage under load by
placing a load such as a type 1157
brake light bulb between the Ignition
Power pin and Ground pin of the
ECUconnector,whilethelampisin
place.
With ignition power to the trailer,
measure the voltage between the
Ignition Power (pin 6) and Ground
(pin18)oftheECUconnector.
Repeat the voltage measurement
with brake lamp power to the trailer,
betweentheBrakeLampPower
(pin12)andtheGround(pin18)of
theECUconnector.
The operating range of the module
is8.0-32.0VDC.Verifythatthe
voltage drop measurements are no
lessthan1.0VDCfromthevehicle
voltage at both the ignition and
brake power inputs.
With a volt/ohm meter, check
thepowerandgroundwiring.Look
for corroded or damaged wires or
connectors.
If repairs are made, rerun the
power-upsequence.Goto
Section A.
If proper loaded and unloaded
voltageismeasuredattheECU
connector, and no corrosion or
damage is found on the wiring,
connectorsorECU,replacethe
module.
With a volt/ohm meter, check the
powerandgroundwiring.Lookfor
corroded or damaged wire or connectors.
If repairs are made, rerun the power‑up
sequence.GotoSectionA.
With
ignition
power to the
trailer, measure
the voltage between
the ignition Power pin and the
GroundpinoftheECUconnector.
Repeat the voltage measurement with
brake lamp power to the trailer, and between the
BrakeLampPowerpinandtheGroundpinoftheECU
connector.
The operating range of the module is
8.0-32.0VDC.Canyouverifythat
measurementsfoundareequal
to the vehicle voltage (within
1VDC)atboththe
ignition and brake
power
inputs?
NO
YES
Measure the loaded
voltage across a type
1157 brake light bulb.
LookingintoTABS-6Advancedmodule
WireHarness,ECUConnectorMeasure:
Pin6(IgnitionPower)toPin18(ground)
andPin12(BrakeLightPower)to
Pin18(ground).