Radio Poor Reception

Radio Poor Reception

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Testing (FM Only)

Important: Perform the Audio System Troubleshooting Hints to properly identify the customers concern before using this diagnostic. Audio System Troubleshooting Hints

Important: Inspect for a improper button connection at the antenna connector to the right rear and left rear quarter glass first before performing this diagnostic.

1. With the ignition OFF, disconnect the antenna cable between the passenger side antenna module and the drivers side antenna module. With a DMM, verify there is less than 0.20 ohm between the negative battery cable and the coaxial cable metal outer shield on each antenna cable.

• If greater than 0.20 ohm, test the antenna module brackets to body ground for an open. If an antenna module bracket(s) is properly grounded, replace the coax cable.

2. With a DMM, verify there is less than 3.5 ohms between the passenger side antenna module end coaxial cable conductor and the drivers side antenna module end coaxial cable conductor.

• If greater than 3.5 ohms, replace the coax cable.

3. Disconnect the passenger side antenna module harness connector. Turn ON the ignition and the radio. With a DMM verify the remote enable signal circuits receives B+.

• If B+ is not present on the remote enable circuit with the ignition and radio ON, test or repair open or short to ground on the remote enable circuit. If open or short to ground can not be found, replace the radio.

4. Reconnect the coax cable between the two antenna modules. Reconnect the antenna module harness connectors. 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 drivers side antenna module 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 module unplugged, replace the drivers side antenna module.

5. Test for continuity of the individual lines of the FM antenna grids on both rear quarter glass. Inspect for a improper button connection at the antenna connector. With a DMM, verify every antenna grid line has continuity end to end.

• If there is no continuity one or more of the antenna grid lines replace the suspect rear quarter glass.

• If all circuits test normal, replace the passenger side antenna module.

Circuit/System Testing (No Reception AM)

Important: Perform the Audio System Troubleshooting Hints to properly identify the customers concern before using this diagnostic. Audio System Troubleshooting Hints

Important: Inspect for a improper button connection at the antenna connector to the right rear and left rear quarter glass first before performing this diagnostic.

1. With the ignition OFF, disconnect AM antenna cable from the passenger side antenna module. With a DMM, verify there is less than 0.20 ohm between the negative battery cable and the AM coaxial cable metal outer shield on the antenna cable.

• If greater than 0.20 ohm replace the suspect coax cable.

2. With a DMM, verify there is less than 3.5 ohms from one end to the other on the AM coaxial cable center conductor.

• If greater than 3.5 ohms, replace the coax cable.

3. Test for continuity of the individual lines of the AM antenna grid on the right rear quarter glass. Inspect for a improper button connection at the antenna connector. With a DMM, verify every antenna grid line has continuity end to end.

• If there is no continuity one or more of the antenna grid lines replace the right rear quarter glass.

• If all circuits test normal, replace the passenger side antenna module.

4. If radio reception problems persist after passenger side antenna module replacement, replace the radio.

Circuit/System Testing (No Reception AM and FM)

Important: Perform the Audio System Troubleshooting Hints to properly identify the customers concern before using this diagnostic. Audio System Troubleshooting Hints

Important: Inspect for a improper button connection at the antenna connector to the right rear and left rear quarter glass first before performing this diagnostic.

1. With the ignition OFF, disconnect AM antenna cable from the radio. With a DMM, verify there is less than 0.20 ohm between the negative battery cable and the coaxial cable metal outer shield on the antennae cable.

• If greater than 0.20 ohm replace the suspect coax cable.

2. Test for continuity of the individual lines of the AM antenna grid on the right rear quarter glass. Inspect for a improper button connection at the antenna connector. With a DMM, verify every antenna grid line has continuity end to end.

• If there is no continuity one or more of the antenna grid lines replace the right rear quarter glass.

• If all circuits test normal, replace the radio.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Control Module References for radio replacement, setup, and programming
* Radio Antenna Module Replacement
* Quarter Window Replacement