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+ | B153A 08, B396A 02 | B153A 08, B396A 02 | -- | -- |
Liftgate Module B+ | U0230 00 | U0230 00 | -- | -- |
Liftgate Position Sensor 5V Reference Voltage | B153E 02 | B153B 08 | 2 | B1019 00 |
Full Open Signal | B153E 08 | B153B 05 | 2 | -- |
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 08 | B153A 00 | B153A 08 |
Position Sensor Signal 1 | B153E 08 | B153E 08 | B153E 05 | -- |
Position Sensor Signal 2 | B153E 08 | B153A 08 | B153E 05 | B153E 08 |
Ratchet Switch Signal | B153A 00 | B153A 08 | 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 | B153E 08 |
Liftgate Motor Open Control | B396A 02 | B396A 04 | B396A 01 | B153E 08 |
Full Open Low Reference | -- | B153B 05 | 2 | -- |
Liftgate Switches Low Reference | -- | B153A 08 | 1 | B153E 08 |
Position Sensor Low Reference | -- | B153E 08 | 2 | -- |
Liftgate Control Module Ground | -- | U0230 00 | 2 | -- |
1. Liftgate Switch Malfunction 2. Liftgate Malfunction | ||||
Circuit/System Description
The power liftgate button and exterior liftgate handle switch are parallel circuits and provide a single input to the liftgate module (LGM). The liftgate switches are supplied voltage and share a common low reference circuit from the LGM. When the switch contacts close, the LGM detects the voltage drop and commands the liftgate to open or close depending upon the position of the liftgate at the time.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
The Liftgate Open/Close Signal circuit is active for greater than 10 minutes.
Action Taken When the DTC Sets
The liftgate open and close functions from the liftgate switches will be inoperative.
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 DTC. |
| • | A history DTC will clear after 50 ignition cycles. |
Diagnostic Aids
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
Description and Operation
Liftgate Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the liftgate switches. The parameter should change between Active and Inactive.
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the liftgate close switch and liftgate handle switch.
- Ignition ON, verify the scan tool Liftgate Handle Sw. Status parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Liftgate Handle Sw. Status parameter is Active.
- Ignition OFF, connect the harness connector at the liftgate handle switch.
- Ignition ON, observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the liftgate handle switch. The parameter should change between Active and Inactive.
- If all circuits test normal, test or replace the liftgate close switch.
| ⇒ | If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the LGM: |
| • | Liftgate close switch signal circuit terminal 1 |
| • | Liftgate handle switch signal circuit terminal A |
| • | Liftgate close switch signal circuit terminal 1 |
| • | Liftgate handle switch signal circuit terminal A |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the LGM. |
| ⇒ | If the parameter does not change, test or replace the liftgate handle switch. |
Component Testing
- Ignition OFF, disconnect the harness connector at the appropriate liftgate switch.
- Test for infinite resistance between the signal terminal and the low reference terminal listed below with the switch in the open position.
- Test for less than 2 ohms between the signal terminal and the low reference terminal listed below with the switch in the closed position.
| • | Liftgate close switch terminal 1 and terminal 2 |
| • | Liftgate handle switch terminal A and terminal B |
| ⇒ | If not the specified value, replace the liftgate switch. |
| • | Liftgate close switch terminal 1 and terminal 2 |
| • | Liftgate handle switch terminal A and terminal B |
| ⇒ | If greater than the specified range, replace the liftgate switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Liftgate Outside Handle Replacement
Control Module References for LGM replacement, setup, and programming
