• | 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+ | 1 | 1 | -- | -- |
Door Lock Switch Lock Signal | B3150 00 | 2 | 2 | -- |
Door Lock Switch Unlock Signal | B3140 00 | 2 | 2 | -- |
All Lock Relay Control | B3135 00 | B3135 00 | 1 | -- |
Door Latch Assembly Control | 1 | 1 | 1 | -- |
Driver Unlock Relay Control | B3125 00 | B3125 00 | B3125 00 | -- |
Passenger Unlock Relay Control | B3130 00 | B3130 00 | B3130 00 | -- |
Window/Door Lock Switch Ground | -- | 2 | 2 | -- |
Relay Ground | -- | 1 | 1 | -- |
1. Door Lock Malfunction 2. Door Lock Switch Malfunction |
The body control module (BCM) controls the door lock, passenger door unlock and driver door unlock relays. Voltage is applied to the appropriate relay through the door lock/unlock control circuit when the BCM detects a door lock/unlock switch activation or a keyless entry lock or unlock command.
The system voltage is 9-16 volts.
The BCM detects a fault on the DRIVER UNLOCK relay control circuit.
The BCM detects a fault on the PASS UNLOCK relay control circuit.
The BCM detects a fault on the ALL LOCK relay control circuit.
The power door locks will malfunction.
• | The DTC will be current for as long as the fault is present. |
• | When the fault is no longer present, the DTC will become 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 All Doors Unlock/Lock with the scan tool, all doors should perform the LOCK and UNLOCK function.
⇒ | If B3125 00 is set, refer to DRIVER UNLOCK Relay Control Malfunction. |
⇒ | If B3130 00 is set, refer to PASS UNLOCK Relay Control Malfunction. |
⇒ | If B3135 00 is set, refer to ALL LOCK Relay Control Malfunction. |
⇒ | 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 ground. 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 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 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, setup, and programming |