Wednesday, June 26, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 625


Reference Information



Schematic Reference



* Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer



Schematics)



* Remote Function Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless Entry/Keyless Entry



Transmitter/Diagrams/Electrical Diagrams)



Connector End View Reference



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



Description and Operation



Keyless Entry System Description and Operation (Without Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and



Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (Without Accessory 2 Way Remote)



)Keyless Entry System Description and Operation (With Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and



Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (With Accessory 2 Way Remote))



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



Ignition ON, observe the scan tool BCM Hood Open Switch and Hood Closed Switch parameters. With the hood open, the Hood Open Switch



parameter should read Active and the Hood Closed Switch parameter should read Inactive. With the hood closed, the Hood Open Switch parameter



should read Inactive and the Hood Closed Switch parameter should read Active.



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the hood ajar switch.



2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal C and ground.



锟斤拷 If greater than the specified range, test the ground circuit for an open/high resistance.



3. Ignition ON, test for 11.5-12.0 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 BCM.



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



BCM.



4. Ignition ON, test for 11.5-12.0 volts between the signal circuit terminal B 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 BCM.



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



BCM.



5. If all circuits test normal, test or replace the hood ajar switch.



Component Testing



Hood Ajar Switch



1. Ignition OFF, disconnect the harness connector at the hood ajar switch.



2. With the switch in the hood closed position, test for infinite resistance between the ground terminal C and the signal terminal A.



锟斤拷 If not infinite, replace the hood ajar switch.



3. Test for less than 2.0 ohms between the ground terminal C and the signal terminal B.

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