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 or Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gages, and Console or Power Door Systems Connector End Views in Doors

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Verify that the turn signal lamps and/or indicators are inoperative.

Do the turn signal lamps and/or indicators operate normally?

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 4

Go to Step 5

4

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

Did you find and correct the condition?

Go to Step 21

Go to Step 12

5

Is only one turn signal lamp inoperative?

Go to Step 6

Go to Step 8

6

Test the inoperative bulb or tail lamp printed circuit board for an open or poor terminal contact. Refer to Circuit Testing in Wiring Systems.

Did you find a condition?

Go to Step 18

Go to Step 7

7

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

Did you find and correct the condition?

Go to Step 21

Go to Step 15

8

Inspect the IGN E fuse and the FLASHER fuse.

Is either fuse open?

Go to Step 11

Go to Step 9

9

Test for an open or high resistance in the following circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems:

    • The turn/hazard flasher battery positive supply voltage
    • The turn/hazard flasher ground
    • The turn signal switch ignition 1 supply voltage

Did you find and correct the condition?

Go to Step 21

Go to Step 10

10

  1. Disconnect the multi-function switch turn signal switch.
  2. Test the multifunction turn signal switch for continuity between the multifunction turn signal switch ignition 1 voltage input terminal and the turn signal flasher signal output terminal in each respective position. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

Go to Step 11

Go to Step 13

11

Test the following circuits for an open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems:

    • The multifunction turn signal switch ignition 1 voltage
    • The turn/hazard flasher supply voltage
    • The left turn flasher signal
    • The right turn flasher signal
    • The left turn lamp supply voltage
    • The right turn lamp supply voltage
    • The left trailer stop/turn lamp supply voltage
    • The right trailer stop/turn lamp supply voltage

Did you find and correct the condition?

Go to Step 21

Go to Step 14

12

Inspect for poor connections at the IPC. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 17

13

Inspect for poor connections at the multifunction turn signal switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 19

14

Inspect for poor connections at the turn/hazard flasher. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 20

15

Inspect for poor connections at the door module for the inoperative outside rear view mirror turn indicator. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 16

16

Important: Perform the set up procedure for the door module.

Replace the door module for the inoperative outside rear view mirror turn indicator. Refer to Door Lock and Side Window Switch Replacement - Driver Side or Door Lock and Side Window Switch Replacement - Passenger Side in Doors.

Did you complete the repair?

Go to Step 21

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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 21

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18

Replace the inoperative bulb or tail lamp printed circuit board. Refer to Tail Lamp Bulb Replacement or Tail Lamp Circuit Board Replacement .

Did you complete the repair?

Go to Step 21

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19

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

Did you complete the repair?

Go to Step 21

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20

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

Did you complete the repair?

Go to Step 21

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21

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3