B2470

DTC B2470

CIRCUIT DESCRIPTION
The cellular portion of the cellular and 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 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 the presence of the cellular antenna
- All the above conditions are present for greater than 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The OnStar(r) status LED turns RED.
- The vehicle is unable to connect to the OnStar(r) Call Center.

CONDITIONS FOR CLEARING THE DTC
- The vehicle communication interface module detects the presence of the cellular and 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

Steps 1-5:

Steps 6-9:

The numbers below refer to the step numbers on the diagnostic table.
2. This step checks the condition of the cellular and navigation antenna.
3. This step tests the condition of the cellular antenna coax and for proper ground of the cellular antenna.