Check the NTSC Signal At the Rear Screens

Pinpoint Tests

CAUTION:
- Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.
- When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00.
- The small size of the pins in the audio/visual harnesses mean that probing must be done with great care. The use of suitable adaptors is very important, and an assistant to hold the harness would make probing far easier.

NOTE:
- Repairs to the harnesses would not be viable. If a circuit fails a pinpoint test, the harness should be replaced.
- When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.
- Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

: CHECK THE NTSC SIGNAL AT THE REAR SCREENS

G240121t1 : CHECK THE SCREENS AND CIRCUITS USING THE VIDEO/AUDIO TESTER (NTSC)
1. Turn the ignition switch to the ACC position.
2. Set the rear entertainment control panel to AUX1 for both screens (refer to Selecting AUX1; AUX2 and audio functions in this section).
3. Set the rear screens to AUTO (refer to Selecting AUTO/PAL/NTSC in this section).
4. Connect the video/audio tester to AUX1, video (yellow).
5. Select NTSC on the video/audio tester, make sure the blue LED is illuminated.

- Is the NTSC test image displayed on both screens?

-> Yes
For PAL signal tests, [[G240121p4]].

-> No
If the test image is displayed on the left-hand screen only, [[G240121p2]].
If the test image is displayed on the right-hand screen only, [[G240121p3]].
If the test image is displayed on neither screen, [[G240121p4]].