For 1990-2009 cars

## Radio Poor Reception Rear Window Antenna

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Radio/Audio System Check? | -- | Go to Step 2 | Go to Radio/Audio System Check
2 | Is the reception weak or noisy only when the rear defogger is on? | -- | Go to Step 3 | Go to Step 4
3 | Test the rear defogger elements for a break. Refer to Rear Window Defogger Inoperative in Stationary Windows. Is the repair complete? | -- | Go to Radio/Audio System Check | --
4 | Connect the base of the rear defogger/antenna grid to chassis ground. Does the reception improve? | -- | Go to Step 5 | Go to Step 6
5 | Repair the radio antenna module case ground. Is the repair complete? | -- | Go to Radio/Audio System Check | --
6 |

• | Turn the ignition switch to the RUN position.

• | Turn the radio to the ON position.

• | Measure the voltage between the rear defogger/antenna grid connector C2 terminal 1 and ground.

Is the voltage within the specified range?

10-15 V

Go to Step 7

Go to Step 8

7 | Test the rear defogger grid for a open. Refer to Defogger Grid Lines Diagnosis . Was an open found? | -- | Go to Step 9 | Go to Step 10
8 | Test CKT 145 (DK GRN) for a open or short to ground. Was a open or short to ground found? | -- | Go to Step 11 | Go to Step 12
9 | Replace the rear window. Refer to Rear Window Replacement . Is the repair complete? | -- | Go to Radio/Audio System Check | --
10 | Replace the radio antenna module. Refer to Radio Antenna Module Replacement . Is the repair complete? | -- | Go to Radio/Audio System Check | --
11 | Repair the open or short to ground in CKT 145 (DK GRN). Is the repair complete? | -- | Go to Radio/Audio System Check | --
12 | Replace the radio. Refer to one of the following procedures:

• | Radio Replacement

• | Radio Replacement

• | Radio Replacement

Is the repair complete?

--

Go to Radio/Audio System Check

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