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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. 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. 2:  The normal operating voltage of the instrument panel dimmer switch is 0.5-11.5 volts.
  2. 3:  If the value is above 11.5 volts, with the sensor disconnected, an open or short to voltage exists. If the value is below 0.5 volts, a short to ground exists.
DTC B2624

Step Action Value(s) Yes No
Schematic Reference: Interior Lights Dimming 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, observe the INTERIOR DIM POT data parameter in the LAMP STATUS data list.
Does the scan tool indicate that the INTERIOR DIM POT parameter is within the specified range?		 0.5-11.5 volts Go to Step 5  Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the instrument panel dimmer switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the INTERIOR DIM POT data parameter.
Does the scan tool indicate that the INTERIOR DIM POT data parameter is greater than the specified value?		 11.5 volts Go to Step 5  Go to Step 4 
4 Test the signal circuit and the return circuit of the instrument panel dimmer switch 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 
5 Test the signal circuit and the return circuit of the instrument panel dimmer switch for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
6 Inspect for poor connections at the harness connector of the instrument panel dimmer switch. 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 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 10  Go to Step 9 
8 Replace the instrument panel dimmer switch. Refer to Instrument Panel (I/P) Dimmer Switch Replacement (Chevrolet)  or Instrument Panel (I/P) Dimmer Switch Replacement (Pontiac) .
Did you complete the replacement?		 - Go to Step 10  -
9
IMPORTANT: Perform the set up 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 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
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