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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 919 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2613TEST DESCRIPTION
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Test Description

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Test Description
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2001 GMC Yukon XL, 2001 GMC Yukon, 2001 GMC Sierra, 2001 GMC Cab & Chassis Sierra, and 2001 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3 

    Tests for the proper operation of the circuit in the low voltage range.

  2. 4 

    Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the instrument panel lamp supply voltage circuit is shorted to ground.

  3. 5 

    Tests for a short to voltage in the battery positive voltage circuit.

  4. 13 

    After replacement of the BCM you must calibrate the new module for proper operation.

DTC B2613

Step Action Value(s) Yes No
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, observe the Dimming Potentiometer parameter in the Body Control Module data list .
Does the scan tool indicate that the Dimming Potentiometer parameter is within the specified range?		 0.1-13.5 V Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the Headlamp and Panel Dimmer switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Dimming Potentiometer parameter.
Does the scan tool indicate that the Dimming Potentiometer parameter is less than the specified value?		 0.1 V Go to Step 4  Go to Step 9 
4 
  1. Turn OFF the ignition.
  2. Connect a 3 amp fused jumper wire between the battery positive voltage circuit of the IP Dim Pole and the instrument panel lamps dimmer switch signal circuit of the Dimming Potentiometer.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Dimming Potentiometer parameter.
Does the scan tool indicate that the Dimming Potentiometer parameter is greater than the specified value?		 13.5 V Go to Step 5  Go to Step 7 
5 
  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the battery positive voltage circuit of the Dimming Potentiometer and the instrument panel lamps dimmer switch circuit of the Dimming Potentiometer.
Does the voltage measure less than the specified value?		 0.1 V Go to Step 10  Go to Step 6 
6 Test the battery positive voltage circuit of the Dimming Potentiometer for a short to voltage. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
7 Test the battery positive voltage circuit of the Dimming Potentiometer for a short to ground, a high resistance, or an open. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 8 
8 Test the instrument panel lamps dimmer switch circuit of the Dimming Potentiometer for a short to ground, a high resistance, or an open. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
9 Test the instrument panel lamps dimmer switch circuit of the Dimming Potentiometer for a short to voltage. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
10 Inspect for poor connections at the harness connector of the Dimming Potentiometer. 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 14  Go to Step 12 
11 Inspect for poor connections at the harness connector of the BCM. 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 14  Go to Step 13 
12 Replace the Headlamp and Panel Dimmer Switch. Refer to Headlamp Switch Replacement .
Did you complete the replacement?		 - Go to Step 14  -
13 
IMPORTANT:

Perform the setup procedure for the body control module.

Replace the body control module. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?		 - Go to Step 14  -
14
  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
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.