38
Diagnostics, Troubleshooting and Testing
Step
Action
Correct
Range
Yes
No
7
Key on.
Right turn signal on.
Turn signal input relay
disconnected from the relay
socket.
Check voltage between relay
socket pin 2/85 and ground.
Continuous
on-o
ff
signal
alternating
between
voltage (9.0-
16.0 volts)
and open
circuit.
Go to Step 8.
If the voltage or performance is out of range,
check between the turn signal relay socket
pin 2/85 and the vehicle right turn signal
circuit for continuity, verify there are no
shorts, loose connections and no sign of
damage or corrosion. Check all circuit wiring,
connections and fuses.
May need to see OEM reference materials for
diagnostics and repair instructions.
Repair any circuit issues in accordance with
OEM repair guidelines.
For any failed WABCO circuit components
contact the WABCO Customer Care Center
at 855-228-3203 (United States and Canada);
001-800-889-1834 (Mexico); or email
wnacustomercare@wabco-auto.com.
8
Key on.
Right turn signal on.
Turn signal input relay
disconnected from the relay
socket.
Load test across socket pins
1/86 and 2/85 with a 2-4 amp
sealed head lamp.
Lamp should
continuously
alternate
between on
(bright) and
o
ff
.
Go to Step 9.
If the lamp performance is out of range, does
not illuminate, does not alternate, is dim
or fl ickers, a wiring or connection issue is
indicated.
Check the pin 1/86 circuit and pin 2/85 circuit
for continuity, verify both circuits have no
shorts, loose connections and no sign of
damage or corrosion. Check all circuit wiring,
connections and fuses.
May need to see OEM reference materials for
diagnostics and repair instructions.
Repair any circuit issues in accordance with
OEM repair guidelines.
For any failed WABCO circuit components
contact the WABCO Customer Care Center
at 855-228-3203 (United States and Canada);
001-800-889-1834 (Mexico); or email
wnacustomercare@wabco-auto.com.
9
Check the turn signal input relay
and socket terminals for signs of
damage or corrosion.
Visual
inspection
checks good.
Turn signal
input relay
failure is
indicated.
Physical damage indicates unit has failed
and will need to be replaced and is not
warrantable.
