GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2002 🢒 Seville 🢒 Body and Accessories 🢒 Doors 🢒 DTC B3142, B3147, B3152, or B3157

Circuit Description

The switch that failed and generated the diagnostic trouble code (DTC) is wired to either the driver door switch assembly (DDSA, or the passenger door module (PDM). When a front door lock switch is activated to the Lock or Unlock function, the DDSA or the PDM receives the switch input and sends the information on to the driver door module (DDM) via the power door serial data communications line. The DDM then sends this message over the Serial Data Class 2 communication line to the rear integration module (RIM), which is the master of all lock operations. If the RIM determines that the message is a valid request and conditions are correct for a door lock function to occur, it sends its OK back, via the Class 2 line to the DDM. The DDM then sends the command out to all the other door modules to Lock or Unlock the doors. Each door module supplies power and ground to its associated lock actuator to Lock or Unlock the doors.

Conditions for Running the DTC

The door modules must be powered and can not have B1327-Battery Voltage Low or B1328-Battery Voltage High set for this DTC to set.

Conditions for Setting the DTC

If the DDM detects that either switch is closed to a Lock or Unlock function for more than 30 continuous seconds, it sets the DTC.

Action Taken When the DTC Sets

The door module ignores inputs from this switch until the switch state changes.

Conditions for Clearing the MIL/DTC

The current DTC will clear when the DDM does not detect the failure during the last module self diagnostic test.

Diagnostic Aids

A sticking or binding switch can cause this DTC to set.

Test Description

The number below refers to the step number on the diagnostic table.

  1. Checks the existing state of the passenger door lock switch by using the current state of the Input parameter.

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics

1

Did you perform the Door Systems Diagnostic System Check?

Go to Step  2

Go to Diagnostic System Check - Door Systems

2

  1. Install a Scan tool.
  2. Turn ON the ignition with the engine OFF.
  3. With the scan tool, observe the appropriate Door Lock Switch parameter in the Driver Door Module Inputs list.

Does the scan tool display Idle?

Go to Step  3

Go to Step  4

3
  1. Activate the associated door lock switch.
  2. With the scan tool, observe the appropriate Door Lock Switch parameter.

Does the Door Lock Switch parameter change state?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step  4

4
  1. Turn OFF the ignition.
  2. Disconnect the associated door lock switch harness connector.
  3. Turn ON the ignition with the engine OFF.
  4. With the scan tool, observe the appropriate Door Lock Switch parameter in the Driver Door Module Inputs list.

Does the scan tool display Idle?

Go to Step  7

Go to Step  5

5

Test the appropriate door lock switch signal circuit 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 appropriate door module harness connector. 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 appropriate door lock switch harness connector. 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 appropriate door module. Refer to Door Control Module Replacement .

Did you complete the replacement?

Go to Step  10

--

9

Replace the appropriate door lock switch. Refer to Front Door Switch Replacement and 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