GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Inspect the inoperative bulbs for a damaged or open filament.
  2. Check that the harness connector seals are not damaged or missing.

Are the bulbs and the harness connectors OK?

--

Go to Step 2

Go to Step 8

2

  1. Turn the ignition switch to the RUN position.
  2. Place the turn signal switch to the inoperative side.

Does the turn indicator flash for the inoperative side?

--

Go to Step  6

Go to Step 4

3

  1. Repair the poor connection or an open in circuit 14 between S290 and S136 for the left tail/stop/turn lamp.
  2. Repair the poor connection or an open in circuit 15 between S289 and S137 for the right tail/stop/turn lamp.

Has the repair been made?

--

Go to Exterior Lights System Check

--

4

  1. Turn the ignition switch to the RUN position.
  2. Place the turn signal switch to the inoperable side.
  3. • Left Side: Using a test light, backprobe between connector C201 terminal A2 to ground.
    • Right Side: Using a test light, backprobe between connector C201 terminal A3 to ground.

Does the test light flash?

--

Go to Step 5

Go to Step 9

5

    • Left Side: Repair the poor connection or an open in circuit 14 between C201 terminal A2 and S290.
    • Right Side: Repair the poor connection or an open in circuit 15 between C201 terminal A3 and S289.

Has the repair been made?

--

Go to Exterior Lights System Check

--

6

Are the side marker lamps and the turn lamps inoperable?

--

Go to Step 3

Go to Step 7

7

    • Left Side: Repair the poor connection or an open in circuit 14 between S136 and the inoperable lamp.
    • Right Side: Repair the poor connection or open in circuit 15 between S137 and the inoperable lamp.

Has the repair made?

--

Go to Exterior Lights System Check

--

8

Replace the damaged component.

Has the repair been made?

--

Go to Exterior Lights System Check

--

9

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

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