Display Unit Inputs and Outputs for Connector B (20P)
Terminal Number
Wire Color
Terminal Name
Description
Voltage (about)
Symptom
1
WHT
+B (+B power source)
Continuous power source
Battery voltage
If open: Screen completely off (no backlight visible).
If short to ground: Blows fuse No. 7 (10 A) in the under-dash fuse/relay box.
2
RED
ACC (Accessory)
Power source for accessory
Battery voltage at ACC (I)
If open: Display and buttons do not work.
If short to ground: Blows fuse No. 32 (7.5 A) in the under-dash fuse/relay box.
5
LT BLU
DISP BUS (+) (Display bus positive)
Data bus (+) GA-Net
0 V−5 V pulses average 2.5 V depends on bus traffic
If open: Navigation buttons and touch screen do not work.
If short to ground: Navigation buttons and touch screen do not work.
8
WHT
R SIG (Red signal)
Red color signal
0−1 V AC
If open: Red color missing (see ‘‘RGB Color'' diagnostic).
If short to ground: Red color missing (see ‘‘RGB Color'' diagnostic).
9
RED
G SIG (Green signal)
Green color signal
0−1 V AC
If open: Green color missing (see ‘‘RGB Color'' diagnostic).
If short to ground: Green color missing (see ‘‘RGB Color'' diagnostic).
10
BLK
GND (Ground)
Ground for display unit
0 V
If open: No change to display.
If short to ground: No change to display.
14
GRY
SH DISP BUS (Shield display bus)
Shield for display bus terminal No. 5, 15
0 V
If open: No change to display.
If short to ground: No change to display.
15
PUR
DISP BUS (−) (Display bus negative)
Date bus (−) GA-Net
0 V−5 V pulses average 2.5 V depends on bus traffic
If open: Navigation buttons and touch screen do not work.
If short to ground: Hard and touch buttons work OK.
17
GRN
GND SIG (Ground signal)
Ground for color signal
0 V
If open: No change to display.
If short to ground: No change to display.
18
YEL
B SIG (Blue signal)
Blue color signal
0−1 V AC
If open: Blue color missing (see ‘‘RGB Color'' diagnostic).
If short to ground: Blue color missing (see ‘‘RGB Color'' diagnostic).
19
BLK
C SIG (Composite signal)
Composite video (vertical/horizontal) synchronizing signal
0.3 V AC
If open: Picture rolls horizontally, colors still visible.
If short to ground: Picture rolls horizontally, colors still visible.
20
GRY
SH SIG (Shield signal)
Shield for terminal No. 8, 9, 17, 18, 19
0 V
If open: No change to display.
If short to ground: No change to display.