Schematic Reference: Navigation System Schematics

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

Did you perform Diagnostic System Check - Navigation System ?

Go to Step 2

Go to Diagnostic System Check - Navigation System

1. Turn ON the ignition. The Cadillac emblem screen appears on the navigation display head (NDH).
2. Leave the vehicle in PARK.
3. Press the audio MENU button on the NDH. The audio menu appears on the display.
4. Press the TV button on the NDH audio menu screen. (This button is present with UE7 only.)
5. Select a TV station. The TV should be clear on the NDH display.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Disconnect the coaxial cable leading to each TV antenna (within the rear window glasss).
2. Test each TV antenna and coaxial cable for an open, a 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 in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 4

1. Disconnect the TV antenna module connector.
2. Turn ON the ignition with the engine off.
3. Test each of the following circuits for a short to voltage:

•	The antenna select Baud 1 signal (+) circuit

•	The antenna select Baud 2 signal (+) circuit

•	The antenna select supply voltage circuit

•	The antenna select signal (-) circuit

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is voltage present?

Go to Step 6

Go to Step 5

Test each of the following circuits for an open or a short to ground.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

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 display head (NDH) for an open, a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

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 in Wiring Systems.

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 display head (NDH). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

Replace the navigation display head (NDH). Refer to Navigation Display Module Replacement .

Did you complete the replacement?

Go to Step 11

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1. Make sure all connections are tight.
2. Turn ON the ignition with the engine off.
3. Select the TV option on the navigation display head (NDH).
4. Select a local station.

Is the picture strong?

Go to Diagnostic System Check - Navigation System

Go to Step 3