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 B3142: Driver Unlock Switch Circuit LowDTC B3152: Driver Lock Switch Circuit Low
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 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, 2 | 2 | 2 | -- |
Passenger Door Lock Switch Unlock Signal | B3145, 2 | 2 | 2 | -- |
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 | -- | 2 | 2 | -- |
1. Power Door Latch System Malfunction 2. Power Door Locks Inoperative | ||||
Circuit/System Description
The driver door lock switch lock and unlock signal circuits provide inputs 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 door lock switch is activated to the Lock or Unlock position, ground is supplied by G201. When the DDSA detects low voltage on a signal circuit, the DDSA will send a message on the class 2 serial data line to the remote control door lock receiver (RCDLR) to enter the power door latches in Lock or Unlock status. The DDSA monitors the signal circuits to determine how long the ground has been applied. For more detailed information concerning power door lock operation refer to Power Door Locks Description and Operation .
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
| • | The DDSA detects a short to ground on the driver door lock switch lock or unlock signal circuit. |
| • | Condition must be present for greater than 30 seconds. |
Actions Taken When the DTC Sets
Stores DTC B3142 or B3152 in DDSA memory.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | You issue a scan tool CLEAR DTCs command. |
Diagnostic Aids
The following conditions may cause an intermittent malfunction:
| • | There is an intermittent short to ground in the driver door lock switch lock or unlock signal circuit. |
| • | The driver door lock switch is shorted to ground internally or is sticking. |
| • | The driver door lock switch was pressed for longer than 30 seconds. |
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 Testing
- Ignition OFF, disconnect the driver door lock switch harness connector.
- Test for less than 1 ohm of resistance between the ground circuit terminal C and ground.
- Ignition ON, verify the scan tool Door Lock Switch parameter is IDLE.
- If all circuits test normal, test or replace the door lock switch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the appropriate door lock switch signal circuit for a short to ground. If the circuit tests normal, replace the DDSA. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
