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Diagnostic Aids

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Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

DTC B2610

Step Action Yes No
Schematic Reference: Interior Lights Dimming Schematics 
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 3  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Turn ON the ignition, with the engine OFF.
  2. Place the headlamps in the ON position.
  3. Move the instrument panel (I/P) dimmer switch from full dim to full bright and back to full dim, leaving in each position for 10 seconds.
Do the dimming lamps illuminate as expected?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Disconnect the body control module (BCM) connector C1.
  2. Using a DMM set to the ohms setting, probe between the I/P dimming voltage reference circuit and the I/P dimming control circuit.
  3. Move the I/P switch from full dim to full bright.
Does the DMM reading change values?		 Go to Step 7  Go to Step 4 
4 Test the I/P lamps dimming voltage reference circuit for the following:
  • An open
  • A high resistance
  • A short to battery positive voltage
  • A short to ground

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 5 
5 Test the I/P dimming control circuit for a short to battery positive voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 5 
6 Replace the headlamp switch. Refer to Headlamp Switch Replacement .
Did you complete the replacement?		 Go to Step 8  -
7 Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 8  -
8
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 Go to Step 3  System OK
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