GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Turn ON the ignition, with the engine OFF.
  2. Operate the turn signals.
  3. Observe the turn signal lamps and indicators.

Do the turn signal lamps and indicators operate properly?

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

Go to Step 3

3

Are only the turn signal indicators in the instrument panel cluster (IPC) inoperative?

Go to Step 13

Go to Step 4

4

Are all turn signal lamps inoperative?

Go to Step 5

Go to Step 10

5

Place the hazard switch in the ON position.

Do all hazard lamps operate properly?

Go to Step 6

Go to Step 14

6

  1. Turn OFF the ignition.
  2. Disconnect the C4 harness connector at the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.
  3. Connect a 3-amp fused jumper between the left turn signal switch signal circuit and a good ground.
  4. Turn ON the ignition, with the engine OFF.

Do the left turn signal lamps illuminate?

Go to Step 7

Go to Step 8

7

  1. Turn OFF the ignition.
  2. Connect a 3-amp fused jumper between the right turn signal switch signal circuit and a good ground.
  3. Turn ON the ignition, with the engine OFF.

Do the right turn signal lamps illuminate?

Go to Step 9

Go to Step 8

8

Test for an open, high resistance, or short to battery voltage in the turn signal switch signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 14

9

Test the turn signal/multifunction switch ground circuit for an open, high resistance, or short to battery voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 12

10

Test the inoperative turn signal lamp supply voltage circuit for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 11

11

Locate and repair an open, high resistance, or short to battery voltage in the ground circuit of the inoperative turn signal lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 15

12

Inspect for poor connections at the harness connector of the turn signal/multifunction switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 16

13

Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 17

14

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 18

15

Replace the inoperative turn signal lamp. Refer to Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement and Tail/Turn Signal Lamp Replacement .

Did you complete the repair?

Go to Step 19

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16

Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 19

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17

Replace the IPC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the repair?

Go to Step 19

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18

Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the repair?

Go to Step 19

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19

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3