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 B2517: Driver Door Latch CircuitDTC B2518: Passenger Door Latch Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Latch Control | 1 | 1 | B2517 | -- |
Driver Door Latch Enable Control | 1 | 1 | B2517 | -- |
Front Passenger Door Latch Control | 1 | 1 | B2518 | -- |
Front Passenger Door Latch Enable Control | 1 | 1 | B2518 | -- |
Driver Door Lock Switch Lock Signal | B3152 | 2 | 2 | -- |
Driver Door Lock Switch Unlock Signal | B3142 | 2 | 2 | -- |
Left Front Exterior Door Handle Switch Signal | B3849 | 1 | 1 | -- |
Left Front Interior Door Handle Switch Signal | B3848 | 1 | 1 | -- |
Passenger Door Lock Switch Lock Signal | B3155 | 2 | 2 | -- |
Passenger Door Lock Switch Unlock Signal | B3145 | 2 | 2 | -- |
Right Front Exterior Door Handle Switch Signal | B1474 | 1 | 1 | -- |
Right Front Interior Door Handle Switch Signal | B2981 | 1 | 1 | -- |
Driver Exterior Door Handle Switch Ground | -- | 1 | 1 | -- |
Driver Interior Door Handle Switch Ground | -- | 1 | 1 | -- |
Passenger Exterior Door Handle Switch Ground | -- | 1 | 1 | -- |
Passenger Interior Door Handle Switch Ground | -- | 1 | 1 | -- |
Driver Door Lock Switch Ground | -- | 2 | 2 | -- |
Passenger Door Lock Switch Ground | -- | 2 | 2 | -- |
| ||||
Circuit/System Description
The remote control door lock receiver (RCDLR), driver door module (DDM), passenger door module (PDM) and body control module (BCM) control the output functions of the power door latches. These output functions allow the RCDLR and BCM to command the power door latch motors to Unlatch.
When the RCDLR receives an input from one of the door handle switches, it checks the Lock/Unlock status of the door. If the status of the door is Unlock, the RCDLR applies the ground for the appropriate power door latch.
At the same time that the RCDLR is receiving its input, the DDM or PDM is also receiving the same input. When the DDM or PDM receives its input from the door handle switch, it checks the window indexing status of the door. If the window is below the index point, it sends a serial data message to the BCM to apply voltage for the appropriate power door latch. If the window is above the index point, it will first index the window, then send a serial data message to the BCM to apply voltage for the power door latch.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
The RCDLR detects a short to voltage in the door latch enable control circuit for greater than 2 minutes.
Actions Taken When the DTC Sets
The driver or passenger doors will not unlatch.
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. |
Diagnostic Aids
If the DTC does not reset after the code is cleared, it may be that the door latch enable control circuit is shorted to voltage. If the voltage circuit that the door lock enable control circuit is shorted to is fused, then the fuse for the voltage circuit would open when a door handle switch is activated and the RCDLR pulls the door lock enable control circuit low. Check related systems for an open fuse.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Power Door Latch Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate door latch.
- Test for less than 10 ohms between the control circuit terminal listed below and ground.
- Test for less than 10 ohms between the control circuit terminal listed below and ground.
- If all circuits test normal, test or replace the door latch.
| • | Driver door latch control terminal 4 |
| • | Passenger door latch control terminal 9 |
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the RCDLR. |
| • | Driver door latch control terminal 3 |
| • | Passenger door latch control terminal 8 |
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the appropriate door latch.
- Ignition ON, install a 15A fused jumper wire between the control terminal listed below and 12 volts:
- Momentarily install a jumper wire between the control terminal listed below and ground. The door latch should perform the LOCK/ UNLOCK function:
- Reverse the jumper wires; the door latch should perform the UNLOCK/LOCK function.
| • | Driver door latch control terminal 3 |
| • | Passenger door latch control terminal 8 |
| • | Driver door latch control terminal 4 |
| • | Passenger door latch control terminal 9 |
| ⇒ | If the function does not perform as specified, replace the door latch. |
| ⇒ | If the function does not perform as specified, replace the door latch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM or RCDLR replacement, setup, and programming |
