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 Descriptor
DTC B2494 02: Liftgate Handle Switch Circuit Short to GroundDiagnostic 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 liftgate handle switch and liftgate close switch consists of parallel circuits that provide a single input to the liftgate control module (LGM). The LGM initiates a liftgate event based on inputs provided by the liftgate handle switch and the liftgate close switch. Power is supplied by the LGM to each switch via the open/close switch signal circuit. When the liftgate handle switch is activated, the switch contacts close, providing a common ground path for the signal circuit through the liftgate handle switch low reference circuit. When the liftgate close switch is activated, the switch contacts close, providing a common ground path for the signal circuit through the liftgate handle switch low reference circuit causing the liftgate to close. 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 B2494 02 will set when the LGM detects a short to ground in the open/close signal circuit or one of the switch inputs is active for 10 minutes or greater.
Action Taken When the DTC Sets
The LGM will disable the open/close switch signal input until the conditions for setting the DTC is no longer present.
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
| • | DTC B2494 02 will set if the liftgate handle switch or liftgate close switch becomes stuck in the closed position. |
| • | Whenever the LGM is disconnected or loses power, the ignition must be cycled OFF then ON. |
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 harness connectors at the liftgate handle switch and liftgate close switch.
- Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal B and ground at the liftgate handle switch harness connector.
- Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal A and ground at the liftgate close switch harness connector.
- Ignition ON, verify the scan tool liftgate handle sw. status parameter is INACTIVE.
- Reconnect the liftgate handle switch harness connector.
- Verify the scan tool liftgate handle sw. status parameter is INACTIVE.
- Reconnect the liftgate close switch harness connector.
- Verify the scan tool liftgate handle sw. status parameter is INACTIVE.
- If all circuits test normal, replace the LGM.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the LGM. |
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the LGM. |
| ⇒ | If not the specified value, test the signal circuit at both switch harness connectors for a short to ground. If the circuit tests normal, replace the LGM. |
| ⇒ | If not the specified value, test or replace the liftgate handle switch. |
| ⇒ | If not the specified value, test or replace the liftgate close switch. |
Component Testing
- Ignition OFF, disconnect the harness connector at the liftgate handle switch.
- Test for infinite resistance between the signal terminal A and the ground circuit terminal B with the switch in the open position.
- Disconnect the harness connector at the liftgate close switch.
- Test for infinite resistance between the signal terminal B and the ground circuit terminal A with the switch in the open position.
| ⇒ | If not within the specified value, replace the liftgate handle switch. |
| ⇒ | If not within the specified value, replace the liftgate close switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for LGM replacement, setup, and programming |
