GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 DTC B2468 Navigation Display Head (NDH) Malfunction

Circuit Description

Internal error detection is determined inside the navigation display head (NDH). No external circuits are involved.

Conditions for Running the DTC

The navigation display head (NDH) performs this test when it detects a power mode transition to one of the following:

    • ACC
    • ON

The navigation display head (NDH) does not set this DTC if B1327 or B1328 is current .

Conditions for Setting the DTC

The navigation display head (NDH) is unable to write to memory and the test detects a computation error.

Action Taken When the DTC Sets

Any of the following may be observed:

    • Black screen and the audio cannot be changed.
    • The TV screen adjustment settings change to the default settings.
    • The navigation screens may still be available.

Conditions for Clearing the DTC

The navigation display head (NDH) is able to write to memory and there is no computation error when there is a power mode transition.

Diagnostic Aids
    • This DTC may be stored as a history DTC with out affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.
    • If this DTC is retrieved as both a current and history DTC, replace the module.

Step

Action

Yes

No

1

Did you perform Diagnostic System Check - Navigation System ?

Go to Step 2

Go to Diagnostic System Check - Navigation System

2
  1. Turn OFF the ignition.
  2. Disconnect the scan tool.
  3. Open, then close driver door to cancel RAP.
  4. Do not operate any vehicle system for one minute.
  5. Connect a scan tool.
  6. Turn ON the ignition with engine off.
  7. Retrieve DTCs from the navigation display head (NDH).
  8. Is DTC B2468 a current DTC?

Go to Step 3

Go to Diagnostic System Check - Navigation System

3

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

Did you complete the replacement?

Go to Step 4

--

4
  1. Use the scan tool in order to clear the DTC.
  2. Operate the vehicle according to the Conditions for Running the DTC in the supporting text.

Does the DTC reset?

Go to Step 2

System OK