GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

SCHEMATIC REFERENCE: Interior Lights Dimming Schematics

1

Did you perform the Lighting Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Do the incandescent lamps operate properly?

--

Go to Step 3

Go to Incandescent Lamps Inoperative

3

Were the VF displays inoperative for all of the following (if equipped)?

    • Radio
    • Instrument cluster (IPC)
    • Heater and A/C control head

--

Go to Step 7

Go to Step 4

4

Was the VF display inoperative for only the radio?

--

Go to Diagnostic System Check - Radio/Audio System in Entertainment

Go to Step 5

5

Was the VF display inoperative for only the instrument cluster (IPC)?

--

Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console

Go to Step 6

6

Was the VF display inoperative for only the heater and A/C control head?

--

Go to Diagnostic System Check w/C67 in HVAC Automatic - Systems or Diagnostic System Check w/CJ2 in HVAC Manual - Systems.

Go to Step 7

7

Inspect for poor connections at the dash integration module (DIM). 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 9

Go to Step 8

8

Replace DIM. Refer to Dash Integration Module Replacement in Body Control System.

Did you complete the replacement?

--

Go to Step 9

--

9

Operate the system in order to verify the repair

Did you find and correct the condition?

--

System OK

Go to Step 2