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. |
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 | -- |
1. Power Door Latch System Malfunction 2. Power Door Locks Inoperative | ||||
Circuit/System Description
Driver Door Lock and Unlock Operation
The driver door lock switch lock and unlock signal circuits provide input to the driver window switch when the driver door lock switch is activated to the Lock or Unlock position. These inputs allow the driver window switch to detect a door lock or unlock request. The driver window switch provides power to the driver door lock switch. When the driver window switch detects low voltage on a signal circuit, the driver window switch will send a message on the serial data line to the remote control door lock receiver (RCDLR) to place the driver and passenger doors in lock or unlock status, disabling or enabling the power door latch.
Passenger Door Lock and Unlock Operation
The passenger door lock switch lock and unlock signal circuits provide input to the passenger door module (PDM) when the passenger door lock switch is activated to the Lock or Unlock position. These inputs allow the PDM to detect a door lock or unlock request. The PDM provides power to the passenger door lock switch. When the PDM detects low voltage on a signal circuit, the PDM will send a message on the serial data line to the RCDLR to place the driver and passenger doors in lock or unlock status, disabling or enabling the power door latch.
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 Door Lock Switch parameter while using the driver door lock switch. The parameter should change from Idle to Lock and Unlock.
- Observe the scan tool Door Lock Switch parameter while using the passenger door lock switch. The parameter should change from Idle to Lock and Unlock.
| ⇒ | If the value does not change, refer to Driver Door Lock Switch Malfunction. |
| ⇒ | If the value does not change, refer to Passenger Door Lock Switch Malfunction. |
Circuit/System Testing
Driver Door Lock Switch Malfunction
- Ignition OFF, disconnect the harness connector at the driver door lock switch.
- Verify that a test lamp illuminates between B+ and the ground circuit terminal C.
- 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 driver door lock switch.
| ⇒ | If the test lamp does not illuminate, 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 driver window switch. |
| • | Signal circuit terminal D |
| • | Signal circuit terminal E |
| ⇒ | 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. |
| ⇒ | 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. |
Passenger Door Lock Switch Malfunction
- Ignition OFF, disconnect the harness connector at the passenger door lock switch.
- Verify that a test lamp illuminates between B+ and the ground circuit terminal C.
- 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 passenger door lock switch.
| ⇒ | If the test lamp does not illuminate, 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 PDM. |
| • | Signal circuit terminal D |
| • | Signal circuit terminal E |
| ⇒ | 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 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 PDM. |
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 C with the switch in the open position.
- Test for less than 2 ohms between the signal terminal E and the ground terminal C with the switch in the unlock position.
- Test for less than 2 ohms between the signal terminal D and the ground terminal C 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 driver door switch assembly and PDM replacement, setup, and programming |
