For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Radio/Audio System Check performed? | -- | Go to Step 2 | Go to Radio/Audio System Check
2 | Is there poor reception only when the rear defogger is ON? | -- | Go to Step 3 | Go to Step 4
3 | Inspect the rear defogger elements for a break. Refer to Grid Line Repair in Stationary Windows. Is the repair complete? | -- | Go to Radio/Audio System Check | --
4 | Connect a good ground to the base of the rear defogger/antenna module. Does the reception improve? | -- | Go to Step 5 | Go to Step 6
5 | Clean and tighten the module's ground screws. Is the repair complete? | -- | Go to Radio/Audio System Check | --
6 |

1. Turn the ignition switch to the RUN position.
2. Turn the radio ON.
3. Measure voltage between the rear defogger/antenna module connector C2, terminal A and ground.

Is battery voltage measured?

--

Go to Step 7

Go to Step 8

7 | Replace the rear defogger/antenna module. Refer to Radio Antenna Module Replacement . Is the repair complete? | -- | Go to Radio/Audio System Check | --
8 |

1. Inspect the circuit for an open or short to ground.
2. If the circuit is OK, service the radio.

Is the repair complete?

--

Go to Radio/Audio System Check

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