GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition switch to the RUN position.
  2. Use a test light, backprobe between connector  C201 terminal  A13 and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 2

2

Replace the turn signal switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Has the repair been made?

--

Go to Exterior Lights System Check

--

3

Using a test light, backprobe between the hazard lamp/turn signal flasher harness connector of connector terminal A1 and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 4

4

Repair the poor connection or an open in circuit 1508.

Has the repair been made?

--

Go to Exterior Lights System Check

--

5

Using a test light, backprobe between the hazard lamp/turn signal flasher harness connector terminal A1 and terminal B2.

Does the test light illuminate?

--

Go to Step 7

Go to Step 6

6

Repair the a poor connection or an open in circuit 150 between the hazard lamp/turn signal flasher harness connector terminal  B2 and G205.

Has the repair been made?

--

Go to Exterior Lights System Check

--

7

Using a test light, backprobe between the hazard lamp/turn signal flasher harness connector terminal  C1 and ground.

Does the test light illuminate?

-

Go to Step 9

Go to Step 8

8

Replace the hazard lamp/turn signal flasher. Refer to Hazard and Turn Signal Flasher Replacement .

Has the repair been made?

--

Go to Exterior Lights System Check

--

9

Using a test light, backprobe between connector  C201 terminal A1 and ground.

Does the test light flash?

--

Go to Step 2

Go to Step 10

10

Repair the poor connection or an open in circuit 16.

Has the repair been made?

--

Go to Exterior Lights System Check

--