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 |
|---|---|---|---|---|
Liftgate Module B+ | B396A 02, B153A 08 | B396A 02, B153A 08 | -- | -- |
Liftgate Position Sensor 5V Reference Voltage | 2 | B153E 08 | 2 | -- |
Full Open Signal | B153B 02 | 2 | 2 | -- |
Liftgate Disable Signal | 1, 2 | 1 | 1 | -- |
Liftgate Open Signal | 1 | 1 | 1 | -- |
Object Sensors Signal | B153F 02 | B153F 05 | B153F 05 | B153F 03, B153F 07 |
Open/Close Switches Signal | B2494 02 | 1, 2 | 1, 2 | -- |
Pawl Switch Signal | B153A 00 | B153A 00 | B153A 00 | B153A 08 |
Position Sensor Signal 1 | B153E 02 | B153E 05, B153E 08 | B153E 05 | -- |
Position Sensor Signal 2 | B153E 02 | B153E 05, B153E 08 | B153E 05 | -- |
Ratchet Switch Signal | B153A 00 | B153A 00 | B153A 00 | B153A 08 |
Sector Switch Signal | B153A 00 | B153A 00 | B153A 00 | B153A 08 |
Disengage Clutch Control | B396B 02 | B396B 04 | B396B 01 | -- |
Engage Clutch Control | B396B 02 | B396B 04 | B396B 01 | -- |
Liftgate Latch Cinch Control | B2495 02 | B2495 04 | B2495 01 | -- |
Liftgate Latch Release Control | B2495 02 | B2495 04 | B2495 01 | -- |
Liftgate Motor Close Control | B396A 02 | B396A 04 | B396A 01 | -- |
Liftgate Motor Open Control | B396A 02 | B396A 04 | B396A 01 | -- |
Full Open Low Reference | -- | 2 | 2 | -- |
Liftgate Switches Low Reference | -- | 1 | 1 | -- |
Position Sensor Low Reference | -- | B0153E 08 | 2 | -- |
I/P Switch Ground | -- | 1 | 1 | -- |
Liftgate Control Module Ground | -- | 2 | 2 | -- |
1. Liftgate Switch Malfunction 2. Liftgate Malfunction | ||||
Circuit/System Description
The handle switch and close switch are parallel circuits and provide a single input to the liftgate control module. The handle/close switch signal circuit is supplied battery voltage through a resistor and monitored within the liftgate control module. The switches share a common low reference circuit from the liftgate control module and when the switch contacts close the signal circuit goes low and the liftgate control module determines the switch to be active.
Conditions for Running the DTC
System voltage to the liftgate control module must be 9-16 volts.
Conditions for Setting the DTC
The handle/close switch signal circuit is active for longer than 10 minutes.
Action Taken When the DTC Sets
Power open and close functions from the handle switch and the rear close switch will be disabled.
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
Important: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power for the appropriate procedure.
Whenever the LGM loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the LGM.
Reference Information
Schematic Reference
Connector End View Reference
Vehicle Access Connector End Views
Description and Operation
Rear Hatch/Gate Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the liftgate handle and liftgate close switches. The value should change between Active and Inactive.
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the liftgate handle and liftgate close switches.
- Ignition ON, verify the scan tool Liftgate Handle Sw. Status parameter is Inactive.
- Ignition OFF, connect the harness connector at the liftgate close switch.
- Ignition ON, observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the liftgate close switch, the parameter should change between Active and Inactive.
- If all circuits test normal, test or replace the liftgate handle switch.
| ⇒ | If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the LGM. |
| ⇒ | If the value does not change, test or replace the liftgate close switch. |
Component Testing
Liftgate Handle Switch
- Ignition OFF, disconnect the harness connector at the liftgate handle switch.
- Test for infinite resistance between the signal terminal A and the low reference terminal B with the switch in the open position.
- Test for less than 2 ohms between the signal terminal A and the low reference terminal B with the switch in the closed position.
| ⇒ | If not the specified value, replace the liftgate handle switch. |
| ⇒ | If greater than the specified range, replace the liftgate handle switch. |
Liftgate Close Switch
- Ignition OFF, disconnect the harness connector at the liftgate close switch.
- Test for infinite resistance between the signal terminal D and the low reference terminal A with the switch in the open position.
- Test for less than 2 ohms between the signal terminal D and the low reference terminal A with the switch in the closed position.
| ⇒ | If not the specified value, replace the liftgate close switch. |
| ⇒ | If greater than the specified range, replace the liftgate close switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for liftgate control module replacement, programming and setup |
