For 1990-2009 cars

Important: Before measuring the resistance of the antenna, remove the negative lead of the battery and zero the J 39200 digital multimeter (DMM) before taking measurements. When inspecting the resistance, cautiously wiggle the lead-in tip and cable. If the resistance does not match the ones listed, some portion of the lead-in is intermittent and needs to be replaced.

Digital Multimeter Probes at Point: | Resistance Measured (Ohms)
--- | ---
3 and 6 | less than 0.15
5 and 6 | infinite
4 and 6 | infinite
1 and 6 | infinite
Ground and 6 | less than 0.15
Ground and 4 | infinite
Ground and 3 | less than 0.15
Ground and 1 | infinite
Ground and 5 | infinite
1 and 5 | less than 3.5
4 and 5 | less than 3.5

The antenna sniffer can be used along with the vehicles radio to locate hot spots that may be generating radio noise interference.

The antenna sniffer can be made from a old antenna lead in cable by cutting off the antenna base lead in. Then strip off approximately 6 cm (2 in) (3) of the outer coax shield (black insulation and braided wire) leaving the inner white insulator (1) and the center conductor wire (2). Use the longest antenna lead in as possible (4), for best results.

By plugging the antenna sniffer into the radio antenna socket you can use the stripped end to search for hot spots.

To use the antenna noise sniffer:

Important: When using the antenna sniffer keep your hand away from the stripped end while searching for noise.

1. Identify the complaint noise.
2. Disconnect the antenna lead in and plug the antenna sniffer (3) into the radio antenna socket.
3. Turn up the radio volume.
4. Search for the noise source (1) along the wiring harness (2).