GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step  2

Go to Diagnostic System Check - Vehicle

2

  1. Turn ON the ignition, with the engine OFF.
  2. Turn the park lamps ON.
  3. Activate the turn signal switch in both directions to illuminate the cornering lamps.

Did the cornering lamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Do the front park lamps operate properly?

Go to Step 4

Go to Symptoms - Lighting Systems

4

  1. Disconnect the inoperative cornering lamp bulb.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn On the inoperative cornering lamp.
  4. Connect a test lamp between the inoperative cornering lamp supply voltage circuit and the inoperative cornering lamp ground circuit.

Did the test lamp illuminate?

Go to Step 8

Go to Step 5

5

Test the inoperative cornering lamp supply voltage supply circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 6

6

Test the inoperative cornering lamp ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 7

7

Test the turn signal switch front park lamps supply voltage circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the inoperative cornering lamp bulb connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 10

9

Inspect for poor connections at the turn signal switch connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 11

10

Replace the inoperative cornering lamp bulb. Refer to Cornering Lamp Bulb Replacement .

Did you complete the replacement?

Go to Step 12

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11

Replace the turn signal switch. Refer to Turn Signal Multifunction Switch Replacement .

Did you complete the replacement?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2