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.