GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Schematic Reference: Navigation System Schematics

1

Did you perform Diagnostic System Check - Navigation System ?

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Go to Step 2

Go to Diagnostic System Check - Navigation System

2

  1. Turn ON the ignition. The Cadillac emblem screen appears on the navigation display head (NDH).
  2. Press the NAV MENU button on the NDH.
  3. When the navigation disclaimer screen appears, press the I AGREE button on the display.
  4. Press the MAP/REPEAT button on the NDH. The display should show the current position of the vehicle. The navigation map should be clear and have clear color.

Does the system operate normally?

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

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the navigation display head (NDH) connector C1.
  3. Measure the resistance between each video color signal circuit and ground at the NDH connector.

Is the resistance within the specified range for each circuit?

70-80ohms

Go to Step 9

Go to Step 4

4

Test each video color signal circuit for an open or a short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 11

Go to Step 5

5

Test the drain wire for an open or a short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 11

Go to Step 6

6

Test the video synchronization circuit for an open or a short. 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

7

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?

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Go to Step 11

Go to Step 8

8

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

Did you complete the replacement?

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Go to Step 11

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9

Inspect for poor connections at the harness connector of the navigation module (NAV). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 11

Go to Step 10

10

Replace the navigation module (NAV). Refer to Navigation Data Processor Replacement in Entertainment.

Did you complete the replacement?

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Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3