Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B153E 02: Liftgate Position Sensor Reference Voltage Circuit Short to GroundDTC B153E 05: Liftgate Position Sensor Reference Voltage Circuit Short to Battery or Open
DTC B153E 08: Liftgate Position Sensor Signal Circuit Signal Invalid
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Latch Pawl Switch Signal | B153A 08 | B153A 08 | 1 | -- |
Latch Ratchet Switch Signal | B153A 08 | B153A 08 | 1 | -- |
Latch Sector Switch Signal | B153A 08 | B153A 08 | 1 | -- |
Liftgate Ajar Switch Signal | B396F 06 | B396F 06 | B396F 0B | -- |
Liftgate Latch Motor Close Control | B2495 02 | B2495 04 | B2495 01 | -- |
Liftgate Latch Motor Open Control | B2495 02 | B2495 04 | B2495 01 | -- |
Liftgate Motor Close Control | B396A 02 | B396A 04 | B396A 01 | -- |
Liftgate Motor Disengage Control | B396B 02 | B396B 04 | B396B 01 | -- |
Liftgate Motor Engage Control | B396B 02 | B396B 04 | B396B 01 | -- |
Liftgate Motor Open Control | B396A 02 | B396A 04 | B396A 01 | -- |
Liftgate Position Sensor Reference Voltage | B153E 02 | B153E 05 | B153E 05 | -- |
Liftgate Position Sensor Signal 1 | B153E 08 | B153E 08 | B153E 08 | -- |
Liftgate Position Sensor Signal 2 | B153E 08 | B153E 08 | B153E 08 | -- |
Liftgate Tape Switch Signal | B153F 02 | B153F 05 | B153F 05 | -- |
Liftgate Full Open Switch Signal | B153B 02 | B153B 05 | B153B 05 | -- |
Open/Close Switch Signal | B2494 02 | 1 | 1 | -- |
Liftgate Full Open Switch Low Reference | -- | B153A 08 | -- | -- |
Liftgate Handle Switch Low Reference | -- | 1 | -- | -- |
Liftgate Position Sensor Low Reference | -- | 1 | -- | -- |
Liftgate Tape Switch Low Reference | -- | B153F 05 | -- | -- |
1. Power Liftgate Malfunction | ||||
Circuit/System Description
The power liftgate module (LGM) uses an optical sensor to monitor the liftgate position at all times. The optical sensor requires a 5-volt reference circuit and a low reference circuit from the LGM. There are 2 liftgate position sensor signal circuits from the liftgate module to the optical sensor. The optical sensor sends pulses through both signal circuits to the LGM whenever the liftgate is in motion. The optical sensor pulses allow the LGM to calculate the liftgate position at all times. The optical sensor signal circuits switch from 0.01-0.45 volt as the liftgate is moving. For more detailed information concerning power liftgate operation refer to Liftgate Description and Operation .
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
| • | DTC B153E 02 will set when the LGM detects a short to ground in the liftgate motor assembly position sensor 5-volt reference circuit. |
| • | DTC B153E 05 will set when the LGM detects a short to voltage or an open/high resistance in the liftgate motor assembly position sensor 5-volt reference circuit. |
| • | DTC B153E 08 will set when 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 condition responsible for setting the DTC no longer exists. |
| • | You issue a scan tool CLEAR DTCs command. |
Diagnostic Aids
| • | Whenever the LGM is disconnected or loses power, the ignition must be cycled OFF then ON. |
| • | Inspect the optical sensor for proper and secure installation in relation to the liftgate motor. |
Reference Information
Schematic Reference
Connector End View Reference
Vehicle Access Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the C3 harness connector at the LGM.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 8 and ground.
- Test for continuity between the voltage reference terminal 8 and low reference terminal 11.
- Test for continuity between the voltage reference circuit terminal 8 and ground.
- Test for continuity between the voltage reference circuit terminal 8 and position sensor signal 1 terminal 9.
- Test for continuity between the position sensor signal 1 circuit terminal 9 and ground.
- Test for continuity between the voltage reference circuit terminal 8 and position sensor signal 2 circuit terminal 10.
- Test for continuity between the position sensor signal 2 circuit terminal 10 and ground.
- If all circuits test normal, replace the LGM.
| ⇒ | If not within the specified range, replace the LGM. |
| ⇒ | If continuity is not found, test the voltage reference circuit terminal 8 and low reference circuit terminal 11 for an open/high resistance. If all circuits test normal, replace the liftgate motor assembly. |
| ⇒ | If continuity is found, test the voltage reference circuit terminal 8 for a short to ground. If the circuit tests normal, replace the liftgate motor assembly. |
| ⇒ | If continuity is not found, test the position sensor signal 1 circuit terminal 9 for an open/high resistance. If all circuits test normal, replace the liftgate motor assembly. |
| ⇒ | If continuity is found, test the position sensor signal 1 circuit terminal 9 for a short to ground. If the circuit tests normal, replace the liftgate motor assembly. |
| ⇒ | If continuity is not found, test the position sensor signal 2 circuit terminal 10 for an open/high resistance. If all circuits test normal, replace the liftgate motor assembly. |
| ⇒ | If continuity is found, test the position sensor signal 2 circuit terminal 10 for a short to ground. If the circuit tests normal, replace the liftgate motor assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for LGM replacement, setup, and programming |
