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 02: Unlock Switch Circuit Short to GroundDTC B3150 02: Lock Switch Circuit Short to Ground
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Module B+ | B0199 00 | B0199 00 | -- | -- |
Left Rear Door Module B+ | 3 | 3 | -- | -- |
Passenger Door Module B+ | U0200 00 | U0200 00 | -- | -- |
Right Rear Door Module B+ | 3 | 3 | -- | -- |
Driver Door Handle Switch Signal | B3849 02 | 1 | 1 | -- |
Driver Door Lock Switch Lock Signal | B3150 02 | 4 | 4 | -- |
Driver Door Lock Switch Unlock Signal | B3140 02 | 4 | 4 | -- |
Passenger Door Handle Switch Signal | B1474 02, B3849 02 | 2 | 2 | -- |
Passenger Door Lock Switch Lock Signal | B3150 02 | 4 | 4 | -- |
Passenger Door Lock Switch Unlock Signal | B3140 02 | 4 | 4 | -- |
Driver Door Deadbolt Control | 1 | 1 | 1 | -- |
Driver Door Latch Control | 1 | 1 | 1 | -- |
Driver Door Lock Indicator Control | 1 | 1 | 1 | -- |
LR Door Latch Control | 3 | 3 | 3 | -- |
Passenger Door Deadbolt Control | 2 | 2 | 2 | -- |
Passenger Door Latch Control | 2 | 2 | 2 | -- |
Passenger Door Lock Indicator Control | 2 | 2 | 2 | -- |
RR Door Latch Control | 3 | 3 | 3 | -- |
Driver Door Lock Indicator Low Reference | -- | 1 | 1 | -- |
Passenger Door Lock Indicator Low Reference | -- | 2 | 2 | -- |
Driver Door Module Ground | -- | U0199 00 | 1 | -- |
Driver Door Handle Switch Ground | -- | 1 | 1 | -- |
Left Rear Door Module Ground | -- | 3 | 3 | -- |
Passenger Door Handle Switch Ground | -- | 2 | 2 | -- |
Passenger Door Module Ground | -- | U0200 00 | 2 | -- |
Right Rear Door Module Ground | -- | 3 | 3 | -- |
1. Driver Door Lock Malfunction 2. Passenger Door Lock Malfunction 3. Rear Door Lock Malfunction 4. Door Lock Switch Malfunction | ||||
Circuit/System Description
The front passenger door lock switch is wired to the passenger door module (PDM). The lock switch receives a constant ground source. There are 2 signal circuits, one for lock signal, and one for unlock signal. When the switch is activated for a lock or unlock function, the normally open switch contacts for that function are closed and provide a switched ground signal to the PDM.
The driver door lock switch is connected to the driver window switch. The lock switch receives a constant ground. There are 2 signal circuits, one for lock signal, and one for unlock signal. When the switch is activated for a lock or unlock function, the normally open switch contacts for that function are closed and provide a switched ground signal to the driver window switch. These switch activations are detected and processed by the driver window switch and then communicated to the driver door module (DDM) via a serial data message.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
B3140 02
The driver window switch or PDM detects a short to ground on the door unlock signal circuit.
B3150 02
The driver window switch or PDM detects a short to ground on the door lock signal circuit.
Action Taken When the DTC Sets
The driver window switch or the PDM will ignore the input from the associated door lock switch.
Conditions for Clearing the DTC
| • | 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. |
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
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 Door Lock Switch parameter while using the driver and passenger door lock switches. The parameter should change from Idle to Lock and Unlock.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
- Ignition ON, verify the scan tool Door Lock Switch parameter is Idle.
- Install a 3A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool Door Lock Switch parameter is Lock.
- Install a 3A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool Door Lock Switch parameter is Unlock.
- If all circuits test normal, test or replace the door lock switch.
| ⇒ | If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the driver window switch or PDM. |
| • | Unlock signal circuit terminal E |
| • | Lock signal circuit 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 driver window switch or PDM. |
| ⇒ | 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 driver window switch or PDM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
- Test for infinite resistance between the signal terminal D and the ground terminal C with the switch in the idle position.
- Test for infinite resistance between the signal terminal E and the ground terminal C with the switch in the idle position.
- Test for less than 2 ohms between the signal terminal D and the ground terminal E with the switch in the lock position.
- Test for less than 2 ohms between the signal terminal E and the ground terminal C with the switch in the unlock position.
| ⇒ | If less than the specified value, replace the door lock switch. |
| ⇒ | If less than the specified value, replace the door lock switch. |
| ⇒ | If greater than the specified value, replace the door lock switch. |
| ⇒ | If greater than the specified value, replace the door lock switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for Driver Window Switch or PDM replacement, setup, and programming |
