Wednesday, July 31, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 307


A short to ground is detected on the specified (+) or (-) signal circuit



DTC B1025 04, B1035 04, B1045 04, B1055 04, B1065 04, B1075 04, B1085 04, B1095 04



An open is detected on the specified (+) or (-) signal circuit



Action Taken When the DTC Sets



No sound is present from one or more of the speakers.



Conditions for Clearing the DTC



Set by Radio



The fault condition becomes history if not present for 0.25 seconds.



Set by Bose Amplifier



The fault condition becomes history after the vehicle ignition has been OFF for several hours and then the ignition turns ON.



Diagnostic Aids



Speakers located in the front A-pillar are connected to the same channel as the speaker in the door. A DTC will only set after the amplifier only on



up-level radios.



Reference Information



Schematic Reference



Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System



Schematics)



Connector End View Reference



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



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 Verification



Radio ON, adjust the fade and balance controls on the radio to test all four channels individually. Each of the four channels should produce clear and



even sound.



Circuit/System Testing



Important: This DTC can be set by either the radio or the amplifier. If the DTC was set by the radio, diagnose the appropriate audio output



circuits to the speakers or the low level inputs to the amplifier (if equipped). If the DTC was set by the amplifier, diagnose audio output



signals to the speakers from the amplifier. If equipped with rear seat audio (RSA) (U42), the RSA must be turned off to perform proper



speaker testing.



Without Amplifier



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



2. Radio ON, test for 5.0-7.5 volts between the signal circuit terminal A and ground.



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



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



radio.



3. Test for 5.0-7.5 volts between the signal circuit terminal B and ground.

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