Navigation System Diagnosis

CIRCUIT DESCRIPTION
The GPS antenna is connected to the navigation module (NAV) by a coaxial cable.

CONDITIONS FOR RUNNING THE DTC
The NAV must detect one of the following power modes:
^ ACC
^ ON
^ RAP
^ RAP UNLK

DTC B2462 does not set if DTC B1328 or B1327 is current.

CONDITIONS FOR SETTING THE DTC
The navigation module (NAV) test the GPS antenna every 10 seconds.

The NAV determines there is an open in the GPS antenna.

DTC B2462 does not set if DTC B1328 or B1327 is current.

ACTION TAKEN WHEN THE DTC SETS
Unable to get GPS location updated, the NAV uses the last reported position and the vehicle speed signal to calculate the vehicle position.

Route guidance may be inaccurate.

This failure has no effect outside the navigation system.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC clears when the NAV does not detect the failure for more than 10 seconds.
^ A history DTC clears after 50 ignition cycles with no repeat of the failure.

DIAGNOSTIC AIDS
An intermittent condition may be caused by the following:
^ Mis-routed harness
^ Rubbed through wire insulation
^ Broken wire inside the insulation

TEST DESCRIPTION

Steps 1-7:

The number(s) below refer to the step number(s) on the diagnostic table.
1. Determines if the malfunction is present.
3. Determines if the malfunction is due to an internal fault in the navigation module (NAV) or a GPS antenna failure.

"For a description of the RPO Code(s) shown in this article or any of the images therein, refer to the RPO Code List found at Vehicle/Application ID". RPO Codes