Yamaha XVZ13TF 1999 Service Manual page 453

AUDIO SYSTEM does not operation
Check:
1. Fuses
2. Ground
3. MCU
4. Wiring connections
(of the entire audio system)
NOTE:
S Before troubleshooting, remove the following
part(-s):
1) Front cowlling
2) Trunk
S Troubleshoot with the following special
tool(-s).
Pocket tester
YU-03112, 90890-03112
1. All AUDIO system does not operation.
1. Fuse
S Check the main back up and audio fuse for
continuity.
Refer to "CHECKING THE FUSES" in
CHAPTER 3.
S Is the main back up and audio fuse OK?
YES
2. Ground lead
S Check the ground lead
S Check the wiring.
S Check the ground.
S Is the ground lead OK?
YES
NO
Replace the fuses.
.
1
NO
Correct the ground
lead.
AUDIO SYSTEM
3. MCU coupler
S Check the connection of MCU 18P connec-
tor.
Refer to "checking the connection".
S Is the MCU connector OK?
YES
4. MCU back up
S Disconnect the MCU 18P connector from
the wire harness.
S Connect the pocket tester (20 V DC) to the
MCU 18P connector as shown.
Back up
Tester positive probe ! red/green
Tester negative probe ! ground
Audio
Tester positive probe ! brown/white
Tester negative probe ! ground
S Measure the voltage (12 V) on the MCU
18P connector.
S Is the voltage within specification?
YES
5. Wiring connections
S Check the wiring (blue/green) of MCU X
front remote controller.
Front remote
Controller / Display
8-55
ELEC
NO
Correct the MCU
connector.
1
2
NO
Correct the wiring.