GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2001 🢒 Regal (China) 🢒 DTC 🢒 DTC B2613

Circuit Description

The Body Control Module (BCM) controls the IP courtesy lamps through the theater dimming 1 control circuit. The BCM grounds the theater dimming 1 control circuit which completes the IP courtesy lamps ground circuit.

Conditions for Running the DTC

The BCM must command the theater dimming 1 control circuit ON.

Conditions for Setting the DTC
    • The BCM detects a high when the output should be low in the theater dimming 1 control circuit.
    • The condition above must be present for more than 0.3 seconds.

Action Taken When the DTC Sets
    • The BCM stores DTC B2613 in memory.
    • The BCM turns off the ground output to the theater dimming 1 circuit.

Conditions for Clearing the DTC
    • A current DTC B2613 will clear if the short to battery in the theater dimming 1 control circuit is no longer detected by the BCM.
    • A history DTC B2613 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present and no other BCM faults are detected.
    • The BCM receives a clear code command from the scan tool.

Diagnostic Aids
    • If the DTC B2613 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections .
    • The following conditions may cause an intermittent malfunction to occur:
       - An intermittent short to battery in the theater dimming 1 control circuit.
       - The BCM is intermittently shorted to battery.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. Watch for the IP courtesy lamps to illuminate. Command both the ON and OFF states. Repeat the commands as necessary.

    2.

  2. Tests for short to voltage in the theater dimming 1 control circuit.

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the light test - theater dimming 1 output to ON and OFF.

Do the IP courtesy lamps turn ON and OFF with each command?

Go to Testing for Intermittent and Poor Connections

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect one of the IP courtesy lamps.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the theater dimming 1 control circuit of the IP courtesy lamp with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 5

4

Test the theater dimming 1 control circuit a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 5

5

Inspect for poor connections at the harness connector of the Body 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 7

Go to Step 6

6

Important: Perform the set up procedure for the body control module.

Replace the BCM. Refer to Body Control Module Replacement .

Did you complete the replacement?

Go to Step 7

--

7
  1. Use the scan tool in order to clear the DTC.
  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