GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the RUN position.
  2. Turn on the left turn signal.

Does the left rear turn signal lamp flash?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Disconnect the left rear turn signal lamp.
  2. Turn on the left turn signal.
  3. Connect a test lamp between the supply voltage circuit of the left rear turn signal lamp and the ground circuit of the left rear turn signal lamp. Refer to Circuit Testing in Wiring Systems.

Does the test lamp flash?

--

Go to Step 4

Go to Step 5

4

Replace the left rear turn signal lamp. Refer to one of the following procedures:

Did you complete the replacement?

--

Go to Step 8

--

5

Connect a test lamp between the supply voltage circuit of the left rear turn signal lamp and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp flash?

--

Go to Step 6

Go to Step 7

6

Repair a poor connection or an open in the ground circuit of the left rear turn signal lamp. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 8

--

7

Repair a poor connection or an open in the supply voltage circuit of the left rear turn signal lamp. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3