Main Wire Harness Inspection; Audio Switch Lines; Audio Display Signal Lines - Honda GL1800 Service Manual

MAIN WIRE HARNESS INSPECTION

Remove the top shelter (page 2-12).

AUDIO SWITCH LINES

Remove the front fairing (page 2-10).
Disconnect the left handlebar switch connectors.
'01 – '03:
– 14P blue
– 12P green
After '03:
– 14P gray
– 12P blue
Check for continuity between the audio unit 34P and
handlebar (audio) switch connectors as shown.
There should be continuity between the same color
wire terminals.
Also, check for a short circuit between each connec-
tor terminal and ground.
There should be no continuity.
34P (black) – 14P
No. 11: Orange
No. 12: White
No. 19: Green
No. 20: Brown
No. 21: Black
No. 28: Red
No. 29: Yellow
'01 – '03: 34P (gray) – 14P
After '03: 34P (gray) – 12P
No. 10: Light green
Check for continuity between the Green wire termi-
nal of the handlebar (audio) switch 12P connector
and ground.
There should be continuity.

AUDIO DISPLAY SIGNAL LINES

Remove the combination meter (page 20-17).
Check for continuity between the audio unit 34P
black and meter 16P connectors.
There should be continuity between the same color
wire terminals.
Also, check for a short circuit between each connec-
tor terminal and ground.
There should be no continuity.
No. 1: Red
No. 2: Black
No. 3: Shield
No. 10: Green
No. 18: White
14P CONNECTOR
34P (black):
21
'01 – '03: 10
14P:
19
(Viewed from the terminal side)
Green
After '03: 10
14P:
(Viewed from the terminal side)
34P (black):
Meter 6P (black):
2 3 4 5 6 7 8 9
0 2 4 5 6 7
8 9 20 2 22232425
26272829303 323334
(viewed from the terminal side)
AUDIO SYSTEM
12P CONNECTOR
34P (gray):
12
11
28
29
20
2 0 8 3
22-7