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Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 5:  This step test determines if the problem exists in the headlamp switch or the BCM.
  2. 10:  After replacement of the BCM you must calibrate the new module for proper operation.
DTC B2610

Step Action Yes No
Schematic Reference: Interior Lights Dimming Schematics 
Connector End View Reference: Lighting Systems Connector End Views  or Data Communication Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Is the TBC 2A fuse in the instrument panel fuse block open? Go to Step 3  Go to Step 4 
3 Test the controls illumination lamps dimming control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 8 
4 Test the instrument panel lamps dimming supply voltage circuit and the controls illumination lamps dimming control circuit for an open, high resistance, short to voltage or short to ground. Refer to Circuit Testing andWiring Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 5 
5 
  1. Ensure that the headlamp switch is in the on position.
  2. Ensure that the instrument panel dimmer switch is the full bright position.
  3. With the headlamp switch still connected, connect a test lamp between the controls illumination lamps dimming control circuit and the ground circuit of the headlamp switch connector.
Does the test lamp illuminate?		 Go to Step 6  Go to Step 7 
6 Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 9 
7 Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 10 
8 Repair the battery positive voltage circuit of the BCM from the TBC 2A fuse in the instrument panel fuse block. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 11  -
9 Replace the headlamp and instrument panel dimmer switch. Refer to Headlamp Switch Replacement .
Did you complete the replacement?		 Go to Step 11  -
10  Replace the BCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 11  -
11
  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
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