• | 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 Handle Switch Signal | 2 | 2 | 2 | -- |
Liftgate Relay Control High | 1 | 1 | -- | -- |
Liftgate Relay Control Low | 1 | 1 | -- | -- |
Liftgate Latch Assembly Control | 1 | 1 | 1 | -- |
Liftgate Handle Switch Ground | -- | 2 | -- | -- |
Liftgate Latch Assembly Ground | -- | 1 | -- | -- |
1. Liftgate Latch Release Inoperative 2. Liftgate Handle Switch Inoperative |
TThe liftgate release switch is an input to the body control module (BCM). The BCM monitors 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.
Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power for the appropriate procedure.
Vehicle Access Connector End Views
Rear Hatch/Gate Description and Operation
⇒ | If the value does not change, refer to Liftgate Handle Switch Malfunction. |
⇒ | If the liftgate latch assembly does not release the liftgate, refer to Liftgate Latch Malfunction. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | 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 BCM. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the liftgate latch assembly does not activate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the liftgate latch assembly. |
⇒ | If the liftgate latch assembly does not activate and the jumper wire fuse opens, test the control circuit for a short to ground. If the circuit tests normal, replace the liftgate latch assembly. |
• | Control circuit terminal 1 |
• | Control circuit terminal 3 |
⇒ | If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the underhood fuse block |
⇒ | If the liftgate latch does not activate, test either control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the underhood fuse block. |
⇒ | If the liftgate latch assembly does not perform as specified, replace the liftgate latch assembly. |
⇒ | If not the specified value, replace the liftgate handle switch. |
⇒ | If greater than the specified range, replace the liftgate handle switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup and programming |