Checking The Relay Unit (Diode) - Yamaha MT-09 2021 Service Manual

Brake light relay (for MTN890D)
B Y Lg/B
L/R
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
No continuity
(between "3" and "4")
EAS30795

CHECKING THE RELAY UNIT (DIODE)

1. Check:
• Relay unit (diode)
Out of specification → Replace.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
TIP
The digital circuit tester readings are shown in
the following table.
ELECTRICAL COMPONENTS
Continuity
Positive tester probe
sky blue "1"
Negative tester probe
black "2"
No continuity
Positive tester probe
black "2"
Negative tester probe
sky blue "1"
Continuity
Positive tester probe
sky blue "1"
Negative tester probe
blue "3"
No continuity
Positive tester probe
blue "3"
Negative tester probe
sky blue "1"
Continuity
Positive tester probe
sky blue "1"
Negative tester probe
sky blue/white "4"
No continuity
Positive tester probe
sky blue/white "4"
Negative tester probe
sky blue "1"
Continuity
Positive tester probe
blue/black "5"
Negative tester probe
blue "3"
No continuity
Positive tester probe
blue "3"
Negative tester probe
blue/black "5"
Br W
a. Disconnect the relay unit coupler from the
wire harness.
b. Connect the digital circuit tester (Ω) to the
relay unit terminal as shown.
8-58
R L/W R
W L/W R L/B L Sb B Sb/W