GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition switch to ON.
  2. Turn the mode selector to ON.
  3. Turn the blower switch to HIGH.

Test the blower switch output-high circuit at the HVAC control assembly for continuity to ground. Refer to Circuit Testing in Wiring Systems.

Is ground present?

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Go to Step 2

Go to Step 3

2

Repair open in the blower switch output-high circuit. Refer to Wiring Repairs in Wiring Systems

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System OK

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3

Replace the HVAC control assembly. Refer to Control Assembly Replacement . Is the repair complete?

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System OK

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