2010 Cadillac CTS Sedan AWD V6-3.6L Page 187

2010 Cadillac CTS Sedan AWD V6-3.6L Page 187

The liftgate object sensor uses two pressure sensitive tape switches mounted to the left and right interior edges of the liftgate panel. When pressure

is applied to a tape switch, the tape switch is closed causing the voltage in the signal circuit to drop. As the liftgate is being commanded to power

close, the signal within the signal circuit will be high. When a tape switch is compressed, as may occur if there is an obstruction present, the voltage

will drop in the signal circuit and the liftgate module will command the liftgate to reverse direction.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

B153F 02

The liftgate module detects a short to ground in the liftgate tape switch signal circuit for greater than 10 minutes.

B153F 05

The liftgate module detects a short to voltage or an open/high resistance in the liftgate tape switch signal circuit or an open/high resistance in the

low reference circuit for greater than 10 minutes.

Action Taken When the DTC Sets

The liftgate module will prevent any movement of the liftgate while attempting to command the liftgate to power close.

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

Note: 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 liftgate module loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the liftgate module.

If the liftgate mode switch is in the Off position, the liftgate will only open and close manually. Before testing the liftgate for power open and

power close functions, verify that the liftgate mode switch is in the 3/4 or MAX position.

Reference Information

Schematic Reference

Liftgate Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Liftgate Schematics)

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/Liftgate

Description and Operation)

Electrical Information Reference

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

Testing/Testing for Intermittent Conditions and Poor Connections)

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

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

Scan Tool Reference

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

Circuit/System Verification

1. Ignition ON, observe the scan tool LGM Secondary Obstacle Detection parameter. The reading should be between 3V-3.5V.

瀚慖f not within the specified range, perform the Circuit/System Testing.