Antenna, Radio: Testing and Inspection

Antenna

INSPECTION

CAUTION: When wiping dirt off the glass to avoid heat wire damage, be careful of the following.
- Use a dry and soft cloth.
- Move the cloth along the heat wire.

Inspection method of antenna, it is differ from printing pattern of antenna.






1. TYPE A
1. Disconnect the ground cable from the battery.
2. Remove the trim.
Sedan model: Remove the rear quarter trim rear.
Wagon model: Remove the rear gate trim.
3. Disconnect the antenna harness connector and antenna terminals.
4. Prepare the extension harness (A), (B).






5. Connect the extension harness (A) to terminal of rear defogger harness (power supply side) and antenna terminal.






6. Connect the extension harness (B) to rear defogger harness (ground side) terminal.
7. Fasten the another side of extension harness (B) to end of printing pattern of grid with tape.






8. Connect the ground cable to battery.
9. Turn the ignition switch to ON.
10. Turn the rear defogger switch to ON.
11. Wrap a piece of aluminum foil around the tip of tester probe and press foil against wire with you finger.






12. Measure the voltage around an antenna wire (a) and (b).






NOTE:
Measuring point (a)
- If the measured value is 6 V, heat wire is open between antenna wire center and positive (+) terminal of probe.
- If it is 0 V, the circuit is open between antenna wire center and ground.
Measuring point (b)
- If the measured value is 12 V, heat wire is open between antenna wire center and positive (+) terminal of probe.
- If it is 6 V, the circuit is open between antenna wire center and ground.

13. Fasten the voltmeter positive (+) side and negative (-) side to end of open harness of step 12).
14. Search a point the voltage changes from 0 V, move the negative (-) probe along antenna wire.






15. Repair the antenna wire that determine the place of the open circuit.

2. TYPE B
Measure the resistance between the antenna terminal and each antenna wire.






1. Disconnect the ground cable from the battery.
2. Wrap a piece of aluminum foil around the tip of probe and press foil against wire with your finger.






3. To locate the broken point, move the probe along antenna wire.






NOTE:
If an antenna wire is OK, resistance will be less than 20 ohms.
If an antenna wire is broken, resistance will be more than 1 Mohms.

4. Repair the antenna wire that determine the place of the open circuit.