Tuesday, June 25, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 544


1. Ignition OFF, disconnect the cellular antenna coax from the CIM module and the cellular antenna.



2. Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground.



锟斤拷 If greater than the specified range, replace the antenna coax.



3. Ignition ON, test for less than 1 volt between the antenna coax outer shield and ground.



锟斤拷 If greater than the specified range, replace the antenna coax.



4. Test for infinite resistance between the antenna coax center terminal and ground.



锟斤拷 If less than the specified value, replace the antenna coax



5. Test for infinite resistance between the antenna coax outer shield and ground.



锟斤拷 If less than the specified value, replace the antenna coax



6. Test for less than 5 ohms at the cellular antenna coax center terminal from end to end.



锟斤拷 If greater than specified value, replace the cellular antenna coax cable.



7. Test for less than 5 ohms at the cellular antenna coax outer shield from end to end.



锟斤拷 If greater than specified value, replace the cellular antenna coax cable.



8. Test for infinite resistance between the antenna coax center terminal and the outer shield.



锟斤拷 If less than specified value, replace the cellular antenna coax cable.



9. If coax cable tests normal, replace the cellular antenna.



10. Clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify DTC B2470 does not set.



锟斤拷 If the DTC sets, replace the CIM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Cellular Communications/Digital Radio Antenna Replacement (See: Accessories and Optional Equipment/Antenna/Antenna, Radio/Service



and Repair/Cellular Communications/Digital Radio Antenna Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for CIM replacement, setup, and programming



B2474



DTC B2474



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptor



DTC B2474 07



- Navigation Display Head Backlighting Performance



Circuit Description



The internal backlighting of the navigation display screen located in the navigation radio.



Conditions for Running the DTC



* Radio ON.



* Battery voltage must be between 9-16 volts.

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