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Diagnostic Aids

If the DTC is a history DTC, the malfunction may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

DTC B2628

Step Action Yes No
Schematic Reference: Interior Lights Dimming Schematics 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Turn the ignition switch to the ON position.
  2. Turn the headlamp switch to the ON position.
  3. Attempt to adjust the lighting intensity of the instrument lamps with the dimmer switch.
Do the instrument panel lamps vary with dimmer control?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 Is DTC B2622 or B2623 set? Go to DTC B2622  or DTC B2623  Go to Step 4 
4 Test for a short to voltage on the instrument panel (I/P) lamps supply voltage circuit. 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 (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 7  Go to Step 6 
6 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 7  -
7
  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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