GM Service Manual Online
For 1990-2009 cars only

HVAC Illumination is Always On

Step

Action

Value(s)

Yes

No

1

Were you sent here from the Interior Lights Dimming Diagnostic System Check?

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Go To Step 2

Go To Interior Lights Dimming Diagnostic System Check

2

Disconnect the body control module (BCM) connector C3.

Is the HVAC illumination still ON?

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Go To Step 3

Go To Step 4

3

Repair a short to battery power in CKT 390.

Is the repair complete?

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Go To Interior Lights Dimming Diagnostic System Check

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4

Replace the BCM.

Is the repair complete?

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Go To Interior Lights Dimming Diagnostic System Check

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