Navigation System Will Not Accept Security Code

Navigation system will not accept security code

NOTE:
- The system will not operate without the 4-digit security (anti-theft) code. Follow the this procedure. (After 10 consecutive tries, you must cycle the key to continue trying)
- The "Navigation System Diagnosis and Core Return Form" is available on ISIS, under "Job aids" and can be printed out for recording this information. This information will help the Reman facility determine what caused the failure.

1. Go into the "System diagnosis menu", select "Unit check," and then "Navi ECU." A brief diagnostic will run for 20 seconds, and the serial number is then displayed.

Is the serial number displayed?

YES - Go to step 2.

NO - Replace the navigation unit.

2. Obtain the Serial Number (3 letters followed by 8 numbers) from the label on the underside of the navigation unit (not the display unit). Using the Serial Number, look up the navigation security code in the Interactive Network, (click: Service, Vehicle Information, Anti-Theft code Inquiry, and then select "Navigation" from the "product" drop down box). Enter the serial number.

Is a 4-digit code displayed?

YES - Go to step 3.

NO - Call the Warranty Department, the telephone number is listed in the PDI/TQI bulletin, to obtain the code. Then go to step 4.

3. Enter the navigation code.

Does the code work?

YES - The system is OK at this time.

NO - Go to step 4.

4. Try entering four zeros (0000) in place for the code. Do the four zeros work to bypass the code screen?

YES - Replace the control unit, and enter in the "problem description field" of the core return form: "Security code is 0000."

NO - Replace the control unit, and enter in the "problem description field" of the core return form: "Won't take security code" (as proof, enclose the sticker that contains the Serial number and the Code).