• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
I/P Fuse Block B+ | 2 | 2 | -- | -- |
Liftgate Release Switch Signal | B2494 | 1 | -- | -- |
Liftgate Relay Low Reference | -- | 2 | 2 | -- |
Liftgate Relay Coil Control | B3265 | 2 | -- | -- |
Liftgate Latch Control | 2 | 2 | 2 | -- |
Liftgate Latch Ground | -- | 2 | 2 | -- |
Liftgate Release Switch Ground | -- | 1 | 1 | -- |
1. Liftgate Release Switch Inoperative 2. Liftgate Release Inoperative |
The liftgate release switch is an input to the body control module (BCM). The BCM supplies battery voltage to the signal circuit and when the release switch is activated the signal circuit voltage goes low. The BCM controls the liftgate release actuator through the liftgate latch release relay. When the release switch signal is activated, the BCM enables the liftgate latch release relay by applying battery voltage to the liftgate latch release relay supply circuit and the relay is energized when the BCM grounds the liftgate latch release relay control circuit. When the relay is energized battery voltage is supplied to the liftgate release actuator through the liftgate release actuator control circuit.
System voltage to the PLGM must be 9-16 volts.
The Liftgate Release Switch signal circuit is active for longer than 10 minutes.
The liftgate open and close functions from the liftgate switch will be inoperative.
• | 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. |
Vehicle Access Connector End Views
Rear Hatch/Gate Description and Operation
Ignition ON, observe the Liftgate Release Sw parameter while pressing the liftgate release switch. The reading should change between Active and Inactive.
Important: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power for the appropriate procedure.
⇒ | If not the specified value, test the signal circuit terminal for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, replace the exterior liftgate release switch. |
⇒ | If greater than the specified range, replace the exterior liftgate release switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming
• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Liftgate Module B+ | 2 | B1019 00 | -- | -- |
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 03 | 2 | B153F 07 | -- |
Open/Close Switches Signal | B2494 02 | 1, 2 | 1, 2 | -- |
Pawl Switch Signal | B153A 00 | B153A 08 | B153A 00 | -- |
Position Sensor Signal 1 | B153E 02 | B153E 05 B153A 08 | B153E 05 | -- |
Position Sensor Signal 2 | B153E 02 | B153E 05 B153A 08 | B153E 05 | -- |
Ratchet Switch Signal | B153A 00 | B153A 00 | B153A 00 | -- |
Sector Switch Signal | B153A 00 | B153A 00 | B153A 00 | -- |
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 |
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 PLGM detects the voltage drop and commands the liftgate to open or close depending upon the position of the liftgate at the time.
The system voltage is 9-18 volts
The Liftgate Open/Close Signal circuit is active for longer than 10 minutes.
The liftgate open and close functions from the liftgate switches will be inoperative.
• | 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. |
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.
Vehicle Access Connector End Views
Rear Hatch/Gate Description and Operation
Ignition ON, observe the scan tool Endgate Handle Sw parameter while pressing and depressing the liftgate switches. The reading should change between Active and Inactive.
⇒ | If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the LGM. |
⇒ | If the reading does not change between Active and Inactive, test or replace the appropriate liftgate switch. |
⇒ | If not the specified value, replace the appropriate liftgate switch. |
⇒ | If greater than the specified range, replace the appropriate liftgate switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for LGM replacement, setup, and programming