2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 255
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.
6. If all circuits test normal, test or replace the liftgate motor assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Liftgate Close Actuator Motor Replacement (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Trunk / Liftgate Motor/Service
and Repair/Liftgate Close Actuator Motor Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for LGM replacement, setup and programming
B153F
DTC B153F
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B153F 02
- Liftgate Object Sensor Signal Circuit Short to Ground
DTC B153F 03
- Liftgate Object Sensor Signal Circuit Voltage Below Treshold
DTC B153F 05
- Liftgate Object Sensor Signal Circuit Short to Battery or Open
DTC B153F 07
- Liftgate Object Sensor Signal Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit/System Description
The liftgate object sensors are pressure sensitive touch tapes located on either side of the upper inside edge of the liftgate panel. The two tape
switches are placed in series between the liftgate object sensor signal circuit and the liftgate object low reference circuit. Each object sensor has a
resistor as well as a switch. The resistors enable the liftgate module to perform diagnostic functions on the circuits. When both touch tape sensors
are not pressed, the 5 volt reference voltage supplied by the liftgate module passes through the resistors and the liftgate module detects
approximately 3.3 volts. Pressing a touch tape will cause the voltage to drop to approximately to 2.5 volts indicating an obstruction is present. If the
