Diagnostic Instructions
| • | 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. |
DTC Descriptors
DTC B3140 00: Driver Unlock Switch CircuitDTC B3145 00: Passenger Unlock Switch Circuit
DTC B3150 00: Driver Lock Switch Circuit
DTC B3155 00: Right Front Lock Switch Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
I/P Fuse Block B+ | 1, 2, 3 | 1, 2, 3 | -- | -- |
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 Door Lock Switch Lock Signal | B3155 00 | B3155 00 | B3155 00 | -- |
Passenger Door Lock Switch Unlock Signal | B3145 00 | B3145 00 | B3145 00 | -- |
Door Latch Control | 1, 2, 3 | 1, 2, 3 | 1, 2, 3 | -- |
Doors Unlocked Control | B3130 00 | B3130 00 | B3130 00 | -- |
LF Door Unlock Control | B3125 00 | B3125 00 | B3125 00 | -- |
Doors Locked Control | B3135 00 | B3135 00 | -- | -- |
Door Lock Switch Ground | -- | 1, 2, 3 | 1, 2, 3 | -- |
I/P Fuse Block Ground | -- | 1, 2, 3 | 1, 2, 3 | -- |
1. Door Lock Malfunction 2. Driver Door Unlock Malfunction 3. Door Unlock Malfunction | ||||
Circuit/System Description
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 senses a door lock/unlock switch activation or a keyless entry lock or unlock command.
Conditions for Running the DTC
The system voltage must be between 9-16 volts.
Conditions for Setting the DTC
B3140 00 or B3150 00
The BCM detects a short to ground in the left lock switch or unlock switch signal circuits.
B3145 00 or B3155 00
The BCM detects a short to ground in the right lock switch or unlock switch signal circuits.
Action Taken When the DTC Sets
| • | The BCM stores the DTC to memory. |
| • | The power door locks will not operate. |
Conditions for Clearing the DTC
| • | This DTC will change from current to history when the fault is no longer present. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Driver Door Lock Sw, Psgr Door Lock Sw, Driver Door Unlock Sw and Psgr Door Unlock Sw. parameters while using the appropriate door lock switch. The reading should change between Inactive and Active.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
- Ignition ON, verify the scan tool Door Lock Sw. parameter is Inactive.
- Verify the scan tool Door Unlock Sw parameter is Inactive.
- If all circuits test normal, test or replace the door lock switch.
| ⇒ | If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
- Test for infinite resistance between the signal terminals D and E and the ground terminal B with the switch in the open position.
- Test for less than 2 ohms between the signal terminal D and the ground terminal B with the switch in the unlock position.
- Test for less than 2 ohms between the signal terminal E and the ground terminal B with the switch in the lock position.
| ⇒ | If less than the specified value, replace the door lock switch. |
| ⇒ | If greater than the specified range, replace the door lock switch. |
| ⇒ | If greater than the specified range, replace the door lock switch |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup and programming |
