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, 1 | -- |
Driver Door Latch Enable Control | 1 | 1 | B2517, 1 | -- |
Front Passenger Door Latch Control | 1 | 1 | B2518, 1 | -- |
Front Passenger Door Latch Enable Control | 1 | 1 | B2518, 1 | -- |
Driver Door Lock Switch Lock Signal | B3152, 2 | 2 | 2 | -- |
Driver Door Lock Switch Unlock Signal | B3142, 2 | 2 | 2 | -- |
Left Front Door Open Switch Signal | 4 | 4 | 4 | -- |
Left Front Exterior Door Handle Switch Signal | B3849, 2 | 1 | 1 | -- |
Left Front Interior Door Handle Switch Signal | B3848, 2 | 1 | 1 | -- |
Passenger Door Lock Switch Lock Signal | B3155, 3 | 3 | 3 | -- |
Passenger Door Lock Switch Unlock Signal | B3145, 3 | 3 | 3 | -- |
Right Front Door Open Switch Signal | 4 | 4 | 4 | -- |
Right Front Exterior Door Handle Switch Signal | B1474, 1 | 1 | 1 | -- |
Right Front Interior Door Handle Switch Signal | B2981, 1 | 1 | 1 | -- |
Door Handle Switch - Driver Exterior Ground | -- | 1 | 1 | -- |
Door Handle Switch - Driver Interior Ground | -- | 1 | 1 | -- |
Door Handle Switch - Passenger Exterior Ground | -- | 1 | 1 | -- |
Door Handle Switch - Passenger Interior Ground | -- | 1 | 1 | -- |
Door Lock Switch - Driver Ground | -- | 2 | 2 | -- |
Door Lock Switch - Passenger Ground | -- | 3 | 3 | -- |
1. Power Door Latch System Malfunction 2. Door Locks Inoperative from Driver Switch 3. Door Lock Inoperative from Passenger Switch 4. Automatic Door Locks Malfunction | ||||
Circuit/System Description
Driver Door Lock and Unlock Operation
The driver door lock switch lock and unlock signal circuits provide input to the driver door switch assembly (DDSA) when the driver door lock switch is activated to the Lock or Unlock position. These inputs allow the DDSA to detect a door lock or unlock request. The DDSA provides power to the driver door lock switch. When the driver door lock switch is activated, ground is supplied by G201. When the DDSA detects low voltage on a signal circuit, the DDSA 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 passenger door lock switch is activated, ground is supplied by G202. When the PDM detects low voltage on a signal circuit, the PDM 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.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Vehicle Access Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- Ignition ON, observe the scan tool LF door open switch parameter located in Keyless/Remote Start Data while opening and closing the driver door. The reading should toggle between OPEN and CLOSED.
- Observe the scan tool RF door open switch parameter located in Keyless/Remote Start Data while opening and closing the passenger door. The reading should toggle between OPEN and CLOSED.
| ⇒ | If the reading does not change between the commanded states, refer to Automatic Door Locks Malfunction. |
| ⇒ | If the reading does not change between the commanded states, refer to Automatic Door Locks Malfunction. |
Circuit/System Testing
Door Locks Inoperative from Driver Switch
- Ignition OFF, disconnect the harness connector at the driver door lock switch.
- Test for less than 1.0 ohm of resistance between the ground circuit terminal C and ground.
- Ignition ON, verify the scan tool Door Lock Switch parameter is IDLE.
- Install a 3-A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool door lock switch parameter is LOCK.
- Install a 3-A 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 greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the scan tool displays LOCK, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the DDSA. |
| ⇒ | If the scan tool displays UNLOCK, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the DDSA. |
| ⇒ | If not the specified value, test the signal circuit terminal D for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDSA. |
| ⇒ | If not the specified value, test the signal circuit terminal E for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDSA. |
Door Lock Inoperative from Passenger Switch
- Ignition OFF, disconnect the harness connector at the passenger door lock switch.
- Test for less than 1.0 ohm of resistance between the ground circuit terminal C and ground.
- Ignition ON, verify the scan tool Door Lock Switch parameter is IDLE.
- Install a 3-A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool door lock switch parameter is LOCK.
- Install a 3-A 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 greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the scan tool displays LOCK, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the PDM. |
| ⇒ | If the scan tool displays UNLOCK, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the PDM. |
| ⇒ | If not the specified value, test the signal circuit terminal D 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 terminal E for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PDM. |
Automatic Door Locks Inoperative
- Ignition OFF, disconnect the harness connector at the inoperative door latch assembly.
- Test for less than 1.0 ohm of resistance between the ground circuit and ground.
- Ignition ON, verify the scan tool Door Open Switch parameter is CLOSED.
- Install a 3-A fused jumper wire between the signal circuit and ground. Verify the scan tool door open switch parameter is OPEN.
- If all circuits test normal, test or replace the inoperative door latch assembly.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the scan tool displays OPEN, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | 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 BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM, DDSA or PDM replacement, setup, and programming |
