Matco Tools RB192 User Manual

Introduction
RB192 Diagnostic Relay Buddy 12/24 is a quick go/no-go tester for automotive Relays. It is also a diagnostic tool that will help you
determine the original cause of the circuit problem!
tester will report its findings by flashing a trouble code. The trouble codes pinpoint where the trouble was found, helping you determine
the root cause of the problem.
Diagnostic Relay Buddy will check the control side of the relay by applying a signal to the internal coil while it checks for proper
functioning of the relay contacts. The relay is switched several times during each test session as it watches for consistency in every
cycle. Whatever trouble is discovered will be reported in the form of a flashing code. If the relay is found to be function ing properly, a
Green LED will be lit.
Remember, it is impossible for Diagnostic Relay Buddy to test the relay contacts under every different load (Amp draw) scenario that your
relay may encounter. A Voltage drop check across the closed contacts while in the actual live circuit may also be advisable.
International Safety Symbols
Refer to the manual for further information
Controls
① 4 pin or 5 pin switch
② test button
③ LED
④ black alligator clip
⑤ red alligator clip
OPERATING INSTRUCTIONS FOR DIAGNOSTIC RELAY BUDDY
1. Connect the power leads to a 12V or 24V power source ~ i.e vehicle battery. Black alligator clip to negative terminal, red
alligator clip to positive terminal. Ensure that the Voltage you are connecting to is the proper Voltage for the relay you are
testing – only test 12V relays using a 12V source and 24V relays using a 24V source.
~ Be particularly mindful if you're testing a 24V relay. If you connect Relay Buddy to a 12V source while testing a 24V relay,
you may get false BAD test results. If you have any doubts, check the voltage source first with a multimeter. ~
2. Check the relay before plugging into the tester. If it's a 4 pin relay, select "4 pin" on the tester.
pin" on the tester.
4. Plug the relay or relay/adapter into one of the three receptacles.
5. Press and hold the "Test" button until the test sequence is complete.
6. The Tester will open and close the relay several times. The GREEN LED will cycle on and off as the test progresses.
is successful and the relay is good, the LED will illuminate GREEN. If any trouble was detected during the tests, the RED LED will
flash a number of times to indicate the particular trouble that was detected. The relay will need to be replaced of course, but the
trouble Codes will help you find the root cause of the trouble.
7. Release the "Test" button after retrieving the test result. Disconnect power leads from the car battery and remove the relay
from the tester.
User's Guide
RB192 Diagnostic Relay Buddy 12/24
RB192 will examine the functionality of the relay and if a problem is discovered the
If it's a 5 pin Relay, select "5
If the test