GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 LeSabre 🢒 Restraints 🢒 SIR 🢒 DTC B3142, B3147, B3152, or B3157

Circuit Description

The switch that failed and generated this diagnostic trouble code (DTC) is wired to either the driver door switch assembly (DDSA) or the passenger door module (PDM). The DDSA or the PDM includes the switch state in the message it sends to the driver door module (DDM) via the power door serial data circuit. The DDM sends the switch message to the rear integration module (RIM), which is the master of all lock operations, as a class 2 message. The RIM checks all conditions and if all conditions are correct, sends its OK to the DDM. When the OK message is received, the DDM sends the required signal to all other door modules via the power door serial data message system.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC B3142 LF Unlock Switch Circuit Low
    • DTC B3147 Passenger Unlock Switch Circuit Low
    • DTC B3152 LF Lock Switch Circuit Low
    • DTC B3157 Passenger Lock Switch Circuit Low

Conditions for Running the DTC

The DDM and PDM must be powered, in communications with each other and cannot have B1327 Battery Voltage Low or B1328 Battery Voltage High set for these DTCs to set.

Conditions for Setting the DTC

If the DDM receives the message that either a passenger door lock switch circuit is closed for more than 30 continuous seconds or a DDSA lock switch circuit is closed for more than 255 seconds (4.25 minutes), the DDM sets a lock switch circuit DTC.

Action Taken When the DTC Sets

The DDM ignores any message from the lock switch designated by the DTC and prevents lock movement from the switch. The DDM will respond to other lock switch messages.

Conditions for Clearing the DTC

The DDM clears this current DTC when the switch message is no longer received and stores a history DTC. The history DTC will clear either after 50 OFF/ON ignition switch cycles without a repeated failure or in response to a scan tool command.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step checks the module input state using the normal input status.

    2.

  2. This step checks to see that the input is seen by the module.

    3.

  3. This step checks to see that the signal circuits to the module are open with the switch removed.

    4.

  4. This step determines that the signal circuits are not shorted.

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics and Door Control Module Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Driver Door Lock Switch or the Pass. Door Lock Switch parameter for the appropriate door in the Driver Door Module (DDM) Inputs list.

Does the scan tool display Idle?

Go to Step 3

Go to Step 4

3

  1. Activate the appropriate door lock switch.
  2. With the scan tool, observe the Driver Door Lock Switch or the Pass. Door Lock Switch parameter for the inoperative door.

Does the door lock switch parameter change state?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Disconnect the inoperative door lock switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Driver Door Lock Switch or the Pass. Door Lock Switch parameter for the appropriate door.

Does the scan tool display Idle?

Go to Step 7

Go to Step 5

5

Test the signal circuits of the inoperative door lock switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

Inspect for poor connections at the harness connector of the inoperative door control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the inoperative door lock switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the inoperative door control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 10

--

9

Replace the inoperative door lock switch. Refer to Door Lock Switch Replacement .

Did you complete the replacement?

Go to Step 10

--

10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK