Pinpoint Test C: Black Screen (Navigation Map Screen Does Not Display)

C1: CHECK SCREEN SAVER FUNCTION
1. Check the screen saver function operation.
Does the screen saver function operate?
- Yes : Press the display panel button. GO to C2.
- No : GO to C2.
C2: CHECK DISPLAY BACKLIGHT
1. Check the display backlight operation.
Does the display backlight operate?
- Yes : Refer to the appropriate system wiring diagrams and check the GVIF cable between Navigation Control Module (NCM) and HLDF screen is properly connected. If the GVIF cable between Navigation Control Module (NCM) and HLDF screen is properly connected, check and install a new GVIF cable as required. Refer to the new module/component installation note at top of DTC Index. If the GVIF cable between Navigation Control Module (NCM) and HLDF screen is properly connected and NOT damaged, check and install a new Navigation Control Module (NCM) as required. Refer to the new module/component installation note at top of DTC Index. Re - check the system
- No : Check the HLDF display. Re - check the system.