Circuit/System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Perform the AUDIO SYSTEM TROUBLESHOOTING HINTS to properly identify the customers concern before using this diagnostic.

Disconnect the antenna module harness connector. Turn ON the ignition and the radio. With a DMM verify the battery positive voltage circuit receives B+.
With the ignition OFF, disconnect the coax cable from the radio. With a DMM, verify there is less than 0.20 ohms between the negative battery cable and the coaxial cable metal outer shield.
- Inspect the antenna ground (antenna base mounting to the vehicle) for a proper connection. If greater than 0.20 ohms. If the antenna is properly grounded replace the antenna coax cable.
Disconnect the coax cable from the antenna. With a DMM, verify there is less than 3.5 ohms between the radio end coaxial cable conductor and the antenna module end coaxial cable conductor.
- If greater than 3.5 ohms, replace the coax cable.
Reconnect the coax cable to the radio and the antenna. Turn ON the ignition and radio. With the scan tool observe and record the signal strength dBuV in the radio data list. Disconnect the coax cable from the radio antenna and observe the dBuV for a drop in signal strength.
- If the dBuV displayed on the scan tool did not drop signal strength with the antenna unplugged, replace the antenna.
- If all circuits test normal, replace the radio.