GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Connect a scan tool.
  2. Read the left turn signal input.
  3. Activate the turn signal switch so that the left turn signal lamp is ON.

Does the data screen change from OFF to ON?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems in Lighting Systems

2

  1. Remove the instrument cluster.
  2. Inspect the instrument panel cluster connector and the left turn signal indicator bulb for an open circuit or loose connection.

Is the instrument panel cluster connector and the left turn signal indicator bulb in normal condition?

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Go to Step 3

Go to Step 4

3

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

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Go to Diagnostic System Check - Lighting Systems in Lighting Systems

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4

Repair the instrument panel cluster connector or replace the left turn signal indicator bulb.

Is the repair complete?

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System OK

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