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B153F



DTC B153F

DIAGNOSTIC INSTRUCTIONS
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC DESCRIPTOR

DTC B153F 03
Liftgate Object Sensor Signal Circuit Voltage Below Threshold

DTC B153F 07
Liftgate Object Sensor Signal Circuit Voltage Above Threshold




DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM DESCRIPTION
The liftgate object sensor uses two tape switches embedded in the liftgate opening weatherstrip to detect any foreign objects in the path of the liftgate. When pressure is applied to the weatherstrip, the tape switch is closed signaling the power liftgate module (PLGM) that an object is in the path of the liftgate. The PLGM will reverse the direction of the liftgate motor should this occur.

The 2 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 PLGM to perform diagnostic functions on the circuits. When both switches are open, voltage supplied by the PLGM passes through the resistors and supplies the PLGM with a reference voltage. If an object is in the path of the moving liftgate, the affected switch would close. The closing of the switch would bypass the resistor and change the reference voltage seen by the PLGM, indicating that one of the switches is closed and an object has been detected.

CONDITIONS FOR RUNNING THE DTC
System voltage to the PLGM must be 9-16 volts.

CONDITIONS FOR SETTING THE DTC

B153F 03
When the PLGM detects a low voltage in the liftgate tape switch signal circuit.

B153F 07
When the PLGM detects high voltage in the liftgate tape switch signal circuit.

ACTION TAKEN WHEN THE DTC SETS
The power liftgate will be inoperative until the conditions for setting the DTC are no longer present. If the liftgate is in motion prior to the DTC setting, the liftgate will close and immediately re-open.

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 status code.
- A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs function.

DIAGNOSTIC AIDS
Whenever the PLGM is disconnected or loses power, the ignition must be cycled OFF then ON.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the harness connectors at the left and right liftgate tape switches.
2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal B and ground at the left liftgate tape switch harness connector.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PLGM.
3. Ignition ON, test for 5 volts between the signal circuit terminal A and ground at the right liftgate tape switch harness connector.
- 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 PLGM.
4. Ignition OFF, disconnect the C1 harness connector at the PLGM.
5. Ignition ON, verify that a test lamp does not illuminate between the signal circuit terminal A and ground.
- If the test lamp illuminates, test the signal circuit for a short to voltage.
6. If all circuits test normal, test or replace the affected liftgate tape switch.

COMPONENT TESTING
1. Ignition OFF, disconnect the harness connector at the right liftgate tape switch.
2. Test for 10K ohms of resistance between the signal terminal A and the low reference terminal B.
- If not within the specified range, replace the right liftgate tape switch.
3. Disconnect the harness connector at the left liftgate tape switch.
4. Test for 10K ohms of resistance between the signal terminal A and the low reference terminal B.
- If resistance is not within the specified range, replace the left liftgate tape switch.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Programming and Relearning Programming and Relearning
- Liftgate Side Upper Sensor Replacement
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