Wireless Communication Malfunction

Cellular, Entertainment, and Navigation | Diagnostic Information and Procedures | Document ID: 6159213 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description The WiFi hardware is internal to the Remote Radio Receiver. The Wi-Fi or WLAN antenna is called the Wireless Communication Antenna which is connected to the Remote Radio Receiver via a coax cable. Wi-Fi expands the abilities of the vehicle as described below: Connect to home Wi-Fi to update software When used with OnStar 4G LTE service, it provides internet access to devices in the vehicle when connected to the Hotspot Enables in-vehicle networking between passengers’ devices, like a home Wi-Fi network Allows remote access to external connected device application data for vehicle internet application use Diagnostic Aids The WLAN/Wireless Communication (Wi-Fi) antenna requires a clear line of sight to the sky to operate properly. The WLAN/Wireless Communication antenna may have limited, intermittent, or no reception near tall buildings or inside structures. Reference Information Schematic Reference Radio/Navigation System Schematics Connector End View Reference Master Electrical Component List Description and Operation Radio/Audio System Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Testing

Note

A purchased data plan through OnStar is required to use the in vehicle Wi-Fi Hotspot.

1. Under settings verify the vehicles Wi-Fi Hotspot is turned ON.
2. Ignition OFF, disconnect the coax cable connector at the T4T Wireless Communication Antenna – WLAN and at the A11 Radio.
3. Verify the coax cable passes the coax cable component test. Refer to Component Testing. ⇒ If the coax cable does not pass the test Replace the coax cable ⇓ If the coax cable passes the test
4. Test or replace the T4T Wireless Communication Antenna – WLAN.
5. Verify a mobile device can be connected to the vehicles Hotspot. ⇒ If a mobile device cannot be connected to the vehicles Hotspot. Replace the A11 Radio. ⇓ If a mobile device can be connected to the vehicles Hotspot.
6. All OK. Component Testing

Caution

Refer to Test Probe Caution.

Note

Before testing the coax cable, check the cable exterior for being pinched, cut, damaged, or having loose connections at the components, which can cause reception issues. To prevent false reading when testing the center coax terminals, use care not to ground the test probe on the outer housing/shield. Coax Cable Test

1. Ignition OFF, disconnect the coax cable at both components.
2. Test for less than 5 Ω between coax cable center terminal end to end. ⇒ If 5 Ω or greater Replace the coax cable ⇓ If less than 5 Ω
3. Test for less than 5 Ω between the coax cable outer shield end to end. ⇒ If 5 Ω or greater Replace the coax cable ⇓ If less than 5 Ω
4. Test for infinite resistance between the coax cable center terminal and the coax cable outer shield. ⇒ If less than infinite resistance Replace the coax cable ⇓ If infinite resistance
5. All OK Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Auxiliary Wireless Communication Interface Antenna Replacement Control Module References for radio replacement, programming, and setup.