• | 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 |
---|---|---|---|---|
Door Lock/Unlock Relay B+ | 1 | 1 | -- | -- |
Driver Door Lock Switch Lock Signal | B3150 00 | B3150 00 | B3150 00 | -- |
Driver Door Lock Switch Unlock Signal | B3140 00 | B3140 00 | B3140 00 | -- |
Passenger/Cargo Door Lock Switch Lock Signal | B3155 00 | B3155 00 | B3155 00 | -- |
Passenger/Cargo Door Lock Switch Unlock Signal | B3145 00 | B3145 00 | B3145 00 | -- |
Passenger/Cargo Unlock Relay Control | B3130 00 | B3130 00 | B3130 00 | -- |
Driver Unlock Relay Control | B3125 00 | B3125 00 | B3125 00 | -- |
Door Lock Relay Control | B3135 00 | B3135 00 | B3135 00 | -- |
Cargo Unlock Relay Control | 2 | 2 | 2 | -- |
Door Lock Switch Ground | -- | 3 | 3 | -- |
Door Lock/Unlock Relay Ground | -- | 1 | 1 | -- |
1. All Latches Malfunction 2. Cargo Door Latch Malfunction 3. Door Lock Switch Malfunction |
When any of the door lock switches are placed in the lock position, a ground signal is applied to the BCM through the door lock signal circuit. Upon receiving this signal, the BCM grounds the control side of the door lock relay through the door lock relay control circuit. Since the other side of the door lock relay coil is connected to battery voltage, the relay is energized. This causes the contacts to close and complete the path from the battery voltage circuit. Voltage is then applied to the lock side of the door lock actuators through the door lock actuator lock circuits. Since the other side of the all the door lock actuators are connected to the normally closed contacts of their respective unlock relays to ground, the doors lock.
Door Lock/Indicator Schematics
Power Door Locks Description and Operation
Control Module References for scan tool information
⇒ | If the value does not change between commanded states, refer to Driver Door Lock Switch Malfunction. |
⇒ | If the value does not change between commanded states, refer to Passenger/Cargo Door Lock Switch Malfunction. |
⇒ | If the driver, passenger or cargo door latch does not LOCK or UNLOCK, refer to Door Lock Malfunction. |
⇒ | If a sliding door latch does not LOCK or UNLOCK, refer to Sliding Door Lock 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 F for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit terminal G 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 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. |
• | Passenger door lock switch terminal A |
• | Rear cargo door lock switch terminal E |
⇒ | 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 listed below for a short to ground. If the circuit tests normal, replace the BCM. |
• | Passenger door lock switch terminal F |
• | Rear cargo door lock switch terminal A |
⇒ | If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM. |
• | Passenger door lock switch terminal G |
• | Rear cargo door lock switch terminal D |
• | Passenger door lock switch terminal F. |
• | Rear cargo door lock switch 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 BCM. |
• | Passenger door lock switch terminal G. |
• | Rear cargo door lock switch terminal D. |
⇒ | 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 the values do not change, test or replace the passenger door lock switch. |
⇒ | If greater than the specified range, test the ground circuit for 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 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 the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the body fuse block. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the body fuse block. |
⇒ | If the test lamp is always OFF during either of the commands, test both control circuits for a short to ground. If the circuits test normal, replace the body fuse block. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. |
⇒ | If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground. If the circuit tests normal, replace the body fuse block. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the door contact plate. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the door contact plate. |
⇒ | If the test lamp remains OFF during either of the commands, test both control circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the door contact plate. |
• | Driver door lock switch terminal F and A |
• | Driver door lock switch terminal G and A |
• | Passenger door lock switch terminal F and A |
• | Passenger door lock switch terminal G and A |
• | Rear cargo door lock switch terminal A and E |
• | Rear cargo door lock switch terminal D and E |
⇒ | If less than the specified value, replace the door lock switch. |
• | Driver door lock switch terminal F and A |
• | Passenger door lock switch terminal F and A |
• | Rear cargo door lock switch terminal A and E |
⇒ | If greater than the specified value, replace the door lock switch. |
• | Driver door lock switch terminal G and A |
• | Passenger door lock switch terminal G and A |
• | Rear cargo door lock switch terminal D and E |
⇒ | If greater than the specified value, replace the door lock switch. |
⇒ | If it does not perform as specified, replace the door latch |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |