Tuesday, April 23, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 361


Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Active Noise Cancellation Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Active Noise



Cancellation Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the appropriate microphone.



2. Ignition ON Radio ON, test for 0.47-2.75 V between the microphone (-) signal circuit terminal A and ground.



锟斤拷 If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the amplifier.



锟斤拷 If less than the specified range, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the



amplifier.



3. Test for 5.75-8.03 V between the microphone (+) signal circuit terminal B and ground.



锟斤拷 If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the amplifier.



锟斤拷 If less than the specified range, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the



amplifier.



4. If all circuits test normal, replace the appropriate microphone.



Repair Instructions



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



* Radio Volume Compensator Interior Noise Microphone Replacement (Floor Console) (See: Accessories and Optional Equipment/Radio,



Stereo, and Compact Disc/Automatic Volume Control/Service and Repair/Radio Volume Compensator Interior Noise Microphone



Replacement (Floor Console))Radio Volume Compensator Interior Noise Microphone Replacement (Headliner) (See: Accessories and



Optional Equipment/Radio, Stereo, and Compact Disc/Automatic Volume Control/Service and Repair/Radio Volume Compensator Interior



Noise Microphone Replacement (Headliner))



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



B1287



DTC B1287



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 Descriptors



DTC B1287 01



- Amplifier Control Signal Circuit Short to Battery



DTC B1287 02



- Amplifier Control Signal Circuit Short to Ground

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