GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: Interior lamps dimming is inoperative.

1

Did you perform the Interior Lamps Dimming Diagnostic System Check?

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Go to Step 2

Go to Interior Lights Dimming System Check .

2

  1. Turn on the ignition.
  2. Turn the headlamp switch to the PARK position.
  3. Do not disconnect the headlamp switch from its connector.
  4. Use a DMM in order to measure the voltage between terminal 1 of the headlamp switch and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 4

Go to Step  3

3

  1. Locate an open or a high resistance in CKT RU70.
  2. Repair the open or the high resistance in CKT RU70.

Did you complete the repair?

--

Go to Step 9

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4

  1. Disconnect the headlamp switch.
  2. Use the DMM in order to measure the resistance between terminal 13 of the headlamp switch connector and a known good ground.

Does the resistance measure near the specified value?

Less than 5 ohms

Go to Step 6

Go to Step 5

5

  1. Locate an open or a high resistance in CKT  F18.
  2. Repair the open or the high resistance in CKT F18.

Did you complete the repair?

--

Go to Step 9

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6

  1. Disconnect the headlamp switch.
  2. Use the DMM in order to measure the voltage between terminal 2 of the headlamp switch connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 7

Go to Step 8

7

  1. Locate a short to B+ in all of the related circuits.
  2. Repair the short to B+ in all of the related circuits.

Did you complete the repair?

--

Go to Step 9

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8

Replace the headlamp switch.

Refer to Instrument Panel, Gauges and Console.

Did you complete the repair?

--

Go to Step 9

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9

  1. Connect all connectors and components that were previously disconnected.
  2. Verify that the interior lamps dim properly.

Do the interior lamps dim properly?

--

Go to Interior Lights Dimming System Check .

Go to Step 1