GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2006 🢒 SRX 🢒 Body 🢒 Doors 🢒 DTC B3142, B3147, B3152, or B3157

Circuit Description

The switch that failed and generated the DTC is wired to either the driver door switch assembly (DDSA), passenger front door module (PFDM), left rear door module (LRDM), or right rear door module (RRDM). When a door lock switch is activated to the Lock or Unlock function, the DDSA, PFDM, LRDM, or RRDM receives the switch input and sends the information on, via the serial data class 2 communications 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 to all the 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 associated door.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC B3142 Unlock Switch Circuit Low
    • DTC B3147 Right Front/Passenger Unlock Switch Circuit Low
    • DTC B3152 Left Front/Driver Lock Switch Circuit Low
    • DTC B3157 Right Front Lock Switch Circuit Low

Conditions for Running the DTC

The DDSA, PFDM, LRDM or RRDM 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 DDSA, PFDM, LRDM or RRDM detects that its associated 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 DDSA, PFDM, LRDM or RRDM ignores inputs from the associated switch until the switch state changes.

Conditions for Clearing the MIL/DTC

The current DTC will clear when the DDSA, PFDM, LRDM or RRDM no longer detects the failure.

Diagnostic Aids

A sticking or binding switch can cause this DTC to set. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

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

  1. Inspects the existing state of the lock switch by using the current state of the input parameter.

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics

Connector End View Reference: Power Door Systems Connector End Views

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 the scan tool, observe the suspect Door Lock Switch parameter in the appropriate area Inputs list:
    4. • Driver Door Switch Assembly (DDSA)
    • Passenger Front Door Module (PFDM)
    • Left Rear Door Module (LRDM)
    •  Right Rear Door Module (RRDM)

Does the scan tool display Idle?

Go to Step 3

Go to Step 4

3
  1. Activate the suspect 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 suspect 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.

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 DDSA, PFDM, LRDM, or RRDM 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

Important: Perform the setup procedure for the replacement door module. Refer to Door Control Module Programming and Setup .

Replace the appropriate DDSA, PFDM, LRDM, or RRDM. 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 appropriate 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