Schematic Reference: Radio/Navigation System Schematics

DEFINITION: When using the navigation radio TV function, the TV reception (TV picture and/or TV sound) is poor or inoperative.

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Place the ignition switch in ON position. The Cadillac emblem screen appears on the navigation radio.
2. The vehicle remains in PARK.
3. Press the audio MENU button on the radio. The audio menu appears on the display.
4. Press the TV button on the radio audio menu screen. This button is present with UE7 only.
5. Select a TV station. The TV should be clear on the radio display.

Is the system OK?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Disconnect the coaxial cable leading to each TV antenna (within the rear window glass).
2. Test each TV antenna and coaxial cable for an open, short to ground, or a short to voltage. Make sure the ignition and the rear defog/defrost is turned ON with the engine OFF when testing for a short to voltage. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 11

Go to Step 4

1. Disconnect the TV antenna module connector.
2. Engine off, ignition on.
3. Test the following circuits for a short to voltage:

•	The antenna select Baud1 signal (+) circuit

•	The antenna select Baud2 signal (+) circuit

•	The antenna select supply voltage circuit

•	The antenna select signal (-) circuit

Refer to Circuit Testing and Wiring Repairs.

Is there any voltage present?

Go to Step 6

Go to Step 5

Test the following circuit for an open or short to ground.

Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

Test the TV signal circuit between the TV antenna module and the navigation radio for an open, a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

Inspect for poor connections at the harness connector of the TV antenna module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

Replace the TV antenna module. Refer to Television Antenna Module Replacement .

Did you find and correct the condition?

Go to Step 11

Go to Step 9

Inspect for poor connections at the harness connector of the navigation radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

Replace the navigation radio. Refer to Control Module References.

Is the replacement complete?

Go to Step 11

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1. Ensure that all the connections are secure.
2. Engine off, ignition on.
3. Select the TV option on the navigation radio.
4. Select a local station.

Is the picture clear?

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Go to Step 3