2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 255

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 255

The LGM does not detect optical sensor pulses when the liftgate is in motion.

Action Taken When the DTC Sets

The power liftgate system will be disabled.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 50 ignition cycles.

Diagnostic Aids

Important: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power (See:

Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Service and Repair/Procedures) for the appropriate procedure.

Whenever the LGM loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the LGM.

Reference Information

Schematic Reference

Liftgate Schematics (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Diagrams/Electrical Diagrams)

Connector End View Reference

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

Description and Operation

Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/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 Verification

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

assembly.

2. Open the liftgate by pressing the touchpad on the liftgate handle switch. The liftgate should release and power open.

3. Close the liftgate by pressing the liftgate button switch. The liftgate should power close, cinch-in, and latch.

Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connector at the LGM.

2. Ignition OFF, test for less than 1 ohm between the low reference terminal 11 at the LGM and ground.

瀚慖f not the specified range, replace the LGM.

3. Ignition ON, test for 4.8-5.2 volts between 5-volt reference terminal 8 at the LGM and ground.

瀚慖f greater than the specified value, replace the LGM.

4. Ignition ON, test for 4.8-5.2 volts are between sensor 1 signal terminal 9 and low reference terminal 11 at the LGM.

瀚慖f not within the specified range, replace the LGM.

5. Test for 4.8-5.2 volts between sensor 2 signal terminal 10 and low reference terminal 11 at the LGM.

瀚慖f not within the specified range, replace the LGM.