Circuit Description
The global positioning system (GPS) antenna is connected to the navigation radio by a coaxial cable.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2462 Global Positioning System (GPS) Signal Error
Conditions for Running the DTC
The radio must detect one of the following power modes:
| • | ACC |
| • | ON |
| • | RAP |
DTC B2462 does not set if DTC B1328 or B1327 is current.
Conditions for Setting the DTC
| • | The navigation radio test the GPS antenna every 300 milliseconds. |
| • | The radio 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 radio 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 radio 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
The numbers below refer to the step numbers on the diagnostic table.
-
This step determines if the malfunction is present.
-
This step determines if the malfunction is due to an internal fault in the navigation radio or a GPS antenna failure.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Navigation System Schematics | ||||
Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | |
2 |
Is the voltage within the specified range? | 4-5.5 V | Go to Step 5 | Go to Step 3 |
Test the GPS cable for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 4 | |
4 | Inspect for poor connections at the harness connector of the GPS cable. 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 7 | Go to Step 6 |
5 | Replace the GPS antenna. Refer to Global Positioning System (GPS) Antenna Replacement . Did you complete the replacement? | -- | Go to Step 7 | -- |
6 | Replace the navigation radio. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 7 | -- |
7 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
