• | 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 |
---|---|---|---|---|
Driver Door Switch B+ | 1 | 1 | -- | -- |
Door Lock Relay B+ | 3,4 | 3,4 | -- | -- |
Door Unlock Relay B+ | 3,4 | 3,4 | -- | -- |
Passenger Door Switch B+ | 2 | 2 | -- | -- |
Driver Door Latch Control | 1 | 1 | 1 | -- |
Passenger Door Latch Control | 2 | 2 | 2 | -- |
Door Lock Relay Control | B3808 | B3808 | 3,4 | -- |
Door Unlock Relay Control | B3809 | B3809 | 3,4 | -- |
Liftgate Latch Control | 5 | 5 | 5 | -- |
Rear Door Latch Control | 3,4 | 3,4 | 3,4 | -- |
Door Lock Relay Ground | -- | 3,4 | 3,4 | -- |
Door Unlock Relay Ground | -- | 3,4 | 3,4 | -- |
1. Driver Door Latch Malfunction 2. Passenger Door Latch Malfunction 3. Rear Door Unlock Inoperative 4. Rear Door Lock Inoperative 5. Liftgate Latch Inoperative |
The body control module (BCM) internally grounds the door lock relay control circuit for the rear door lock relay when it receives a serial data message from the driver door switch (DDS) or passenger door switch (PDS). When the BCM grounds the door lock relay control circuit the rear door lock relay is energized and locks the rear doors.
The battery voltage must be between 9-16 volts.
The BCM detects a short to ground on the door lock relay control circuit for greater than 60 seconds
The rear doors will not lock when using the door lock switch.
• | 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 |
Door Lock/Indicator Schematics
Power Door Locks Description and Operation
Control Module References for scan tool information
Ignition ON, command the rear doors to LOCK and UNLOCK with a scan tool. The rear doors should LOCK and UNLOCK when changing between the commanded states.
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If not within the specified range, replace the relay. |
• | 30 and 86 |
• | 30 and 87 |
• | 30 and 85 |
• | 85 and 87 |
⇒ | If less than the specified value, replace the relay. |
⇒ | If greater than the specified range, replace the relay. |
⇒ | If greater than specified range, replace the relay. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, programming, and setup |