Circuit/System Testing

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect both the GPS and cell coax cable connectors at the K73 telematics communication interface control module.
Connect the EL-49903 to the K73 telematics communication interface control module. See Special Tools .
Clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify DTC B2470 does not set.
- If the DTC sets, replace the K73 telematics communication interface control module.
Ignition OFF, disconnect the EL-49903 from the K73 telematics communication interface control module, and the antenna coax from the T4G cellular phone antenna. See Special Tools .
Ignition ON, test for less than 1 V between the antenna coax center terminal and ground.
- If greater than the specified range, replace the antenna coax.
Ignition ON, test for less than 1 V between the antenna coax outer shield and ground.
- If greater than the specified range, replace the antenna coax.
Test for infinite resistance between the antenna coax center terminal and ground.
- If less than the specified value, replace the antenna coax.
Test for infinite resistance between the antenna coax outer shield and ground.
- If less than the specified value, replace the antenna coax.
Test for less than 5 Ω at the cellular antenna coax center terminal from end to end.
- If greater than specified value, replace the antenna coax.
Test for less than 5 Ω at the cellular antenna coax outer shield from end to end.
- If greater than specified value, replace the antenna coax.
Test for infinite resistance between the antenna coax center terminal and the outer shield.
- If less than specified value, replace the antenna coax.
If coax cable tests normal, replace the T4G cellular phone antenna.