Circuit Description
The Navigation Antenna is connected to the Vehicle Communication Interface Module with a RG-174 coax cable. The Vehicle Communication Interface Module polls the data from the Navigation antenna once every second.
Conditions for Running the DTC
| • | The ignition must be in the RUN or ACC position. |
| • | The system voltage is at least 9.5 volts and no more than 15.5 volts. |
| • | All the above conditions are present for greater than 1 second. |
Conditions for Setting the DTC
| • | The Vehicle Communication Interface Module does not detect a Navigation signal. |
| • | All the above conditions are present for greater than 1 second. |
Action Taken When the DTC Sets
| • | The OnStar® status LED turns RED. |
| • | The OnStar® Call Center cannot locate the vehicle. |
Conditions for Clearing the DTC
| • | The Vehicle Communication Interface Module detects the presence of a Navigation antenna. |
| • | A history DTC clears after 50 malfunction free ignition cycles. |
| • | The Vehicle Communication Interface Module receives the clear DTC command from the scan tool. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: OnStar Schematics Connector End View Reference: Cellular Communication Connector End Views | |||
1 | Did you perform the Cellular Communication Diagnostic System Check? | Go to Step 2 | |
|
Notice: Using a DMM to measure the resistance of the navigation antenna coax from the center conductor to the outer shield while the antenna is still connected will damage the navigation antenna. Inspect the Navigation Antenna and Navigation Antenna Coax for damage. Is the antenna or coax cable damaged? | Go to Step 4 | Go to Step 3 | |
3 | Inspect for poor connections at the harness connector of the Vehicle Communication Interface Module. 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 5 | Go to Step 4 |
4 | Replace the Navigation antenna. Refer to Navigation Antenna Replacement . Is the repair complete? | Go to Step 5 | -- |
5 |
Does the DTC reset? | Go to Step 6 | System OK |
6 | Replace the Vehicle Communication Interface Module module. Refer to Communication Interface Module Replacement . Did you complete the replacement? | Go to Step 2 | -- |
