GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2001 🢒 Regal (China) 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Turn Signal Lamps and/or Indicators Inoperative

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2
  1. Turn the ignition switch to the ON position.
  2. Place the turn signal switch in the LH and RH on position.

Do the turn signals operate properly?

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

Go to Step 3

3

Are all of the turn signal lamps and indicators inoperative?

Go to Step 7

Go to Step 4

4

Are the rear turn signal inoperative?

Go to Step 11

Go to Step 5

5

Observe the following lamps :

    • The front turn signal
    • The side repeater lamp
    • The turn signal indicator

Are all of the preceding lamps inoperative on the LH or RH side?

Go to Step 19

Go to Step 6

6

Are only the turn signal indicators inoperative?

Go to Step 18

Go to Step 12

7

Check the TURN SIGNAL CORN LPS fuse for an open.

Is the TURN SIGNAL CORN LPS fuse open?

Go to Step 28

Go to Step 8

8
  1. Turn the ignition to the ON position, with the engine OFF.
  2. Disconnect the hazard lamp/turn signal flasher.
  3. Connect a test lamp between the turn/hazard flasher supply voltage circuit of the hazard lamp/turn signal lamp flasher and a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 16

9

Connect a test lamp between the turn/hazard flasher supply voltage circuit of the hazard lamp/turn signal lamp flasher and the ground circuit of the hazard lamp/turn signal flasher .

Does the test lamp illuminate?

Go to Step 10

Go to Step 26

10
  1. Install a fused jumper between the turn/hazard flasher supply voltage circuit of the hazard lamp/turn signal flasher and the turn signal flasher signal circuit of the hazard lamp/turn signal flasher.
  2. Place the turn signal switch in the RH on position and the LH on position.

Do the turn signal lamps illuminate?

Go to Step 20

Go to Step 15

11
  1. Turn the ignition switch to the ON position.
  2. Disconnect the inoperative rear turn signal lamp.
  3. Connect a test lamp between the supply voltage circuit of the inoperative rear turn signal lamp and a good ground.
  4. Turn ON the inoperative turn signal.

Does the test lamp flash ON and OFF?

Go to Step 21

Go to Step 14

12
  1. Turn the ignition switch to the ON position.
  2. Disconnect the inoperative turn signal lamp.
  3. Connect a test lamp between the supply voltage circuit of the inoperative turn signal lamp and a good ground.
  4. Turn ON the inoperative turn signal.

Does the test lamp flash ON and OFF?

Go to Step 13

Go to Step 30

13

Connect a test lamp between the ground circuit of the inoperative turn signal lamp and supply voltage circuit of the inoperative turn signal lamp.

Does the test lamp illuminate?

Go to Step 24

Go to Step 29

14

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

Did you find and correct the condition?

Go to Step 35

Go to Step 22

15

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

Did you find and correct the condition?

Go to Step 35

Go to Step 22

16

Test for an open or high resistance in the ignition 1 voltage circuit of the turn signal switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 35

Go to Step 17

17

Test for an open or high resistance in the turn/hazard flasher supply voltage circuit of the hazard lamp/turn signal lamp flasher. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 35

Go to Step 22

18
  1. Turn OFF the ignition.
  2. Disconnect the Instrument panel cluster.
  3. Connect a test lamp between the supply voltage circuit of the inoperative turn signal indicator and a good ground.
  4. Turn ON the inoperative turn signal indicator.
  5. Turn ON the ignition.

Does the test lamp flash ON and OFF?

Go to Step 23

Go to Step 25

19

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

Did you find and correct the condition?

Go to Step 35

Go to Step 22

20

Inspect for poor connections at the harness connector of the hazard lamp/turn signal flasher. 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 35

Go to Step 32

21

Connect a test lamp between the ground circuit of the inoperative rear turn signal lamp and supply voltage circuit of the inoperative rear turn signal lamp.

Does the test lamp illuminate?

Go to Step 24

Go to Step 27

22

Inspect for poor connections at the turn signal 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 35

Go to Step 31

23

Inspect for poor connections at the instrument cluster. 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 35

Go to Step 33

24

Inspect for poor connections at the inoperative turn signal lamp. 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 35

Go to Step 34

25

Repair an open or high resistance in the supply voltage circuit of the inoperative turn signal indicator. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 35

--

26

Repair the open or high resistance in the ground circuit of the hazard lamp/turn signal flasher. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 35

--

27

Repair the open or high resistance in the turn signal supply voltage circuit of the inoperative rear turn signal. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 35

--

28

Repair the short to ground in the ignition 1 voltage circuit of the turn signal switch or the turn/hazard flasher supply voltage circuit of the hazard lamp/turn signal flasher. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 35

--

29

Repair the open or high resistance in the ground circuit of the inoperative turn lamp. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 35

--

30

Repair the open or high resistance in the turn signal supply voltage circuit of the inoperative turn lamp. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 35

31

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

Did you complete the replacement?

Go to Step 35

--

32

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

Did you complete the replacement?

Go to Step 35

--

33

Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Did you complete the repair?

Go to Step 35

--

34

Replace the inoperative turn signal lamp. Refer to Fog Lamps Inoperative , Park/Turn Signal/Side Marker Lamp Replacement , or Rear Turn Signal Lamp Bulb Replacement .

Did you complete the replacement?

Go to Step 35

--

35

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2