Sunday, August 11, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 169


Repairs/Wiring Repairs)



Scan Tool Reference



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



Circuit/System Verification



1. Ignition ON, doors unlocked, transaxle in Park, liftgate closed, disable the power liftgate by pressing the liftgate enable/disable button on the



I/P switch assembly.



2. Observe the scan tool LGM Latch Sector Sw parameter while manually opening the liftgate, the parameter should change from Inactive to



Active to Inactive when opening the liftgate.



3. Observe the scan tool LGM Latch Pawl Sw. and LGM Latch Ratchet Sw. parameters while manually opening the liftgate, the parameters



should change from Inactive to Active.



Circuit/System Testing



1. Ignition OFF, disconnect the X2 harness connector at the LGM



2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.



锟斤拷 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the



B+ circuit fuse is open, replace the LGM.



3. Ignition OFF, connect the X2 harness connector at the LGM and disconnect the harness connector at the liftgate latch assembly.



4. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.



锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the LGM.



5. Ignition ON, verify the scan tool LGM Latch Pawl Sw. parameter is Inactive.



锟斤拷 If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the LGM.



6. Verify the scan tool LGM Latch Ratchet Sw. parameter is Inactive.



锟斤拷 If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the LGM.



7. Verify the scan tool LGM Latch Sector Sw. parameter is Inactive.



锟斤拷 If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the LGM.



8. Install a 3A fused jumper wire between the signal circuit terminal 5 and low reference circuit terminal 2. Verify the scan tool LGM Latch Pawl



Sw. parameter is Active.



锟斤拷 If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the



LGM.



9. Install a 3A fused jumper wire between the signal circuit terminal 6 and low reference circuit terminal 2. Verify the scan tool LGM Latch



Ratchet Sw. parameter is Active.



锟斤拷 If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the



LGM.



10. Install a 3A fused jumper wire between the signal circuit terminal 4 and low reference circuit terminal 2. Verify the scan tool LGM Latch



Sector Sw. parameter is Active.



锟斤拷 If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the



LGM.



11. If all circuits test normal, test or replace the liftgate latch assembly.



Repair Instructions



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



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

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