GM Service Manual Online
For 1990-2009 cars only

LEFT TURN indicator Inoperative

Step

Action

Value(s)

Yes

No

1

Did you perform the instrument cluster diagnostic system check?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

  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?

--

Go to Step 3

Go to Exterior Lights System Check

3

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

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

--

Go to Step 4

Go to Step 5

4

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

Go to Exterior Lights System Check

--

5

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

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

Go to Exterior Lights System Check