GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Montana 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Turn Signal Lamps Inoperative - Left or Right Side

Turn Signal Lamps Inoperative - Left or Right Side Domestic

Step

Action

Yes

No

1

Did you perform the 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 ON position.
  3. Place the turn signal switch in the RH ON position.
  4. Verify that either a RH or LH turn signal is inoperative.

Are the turn signals operating properly?

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

Go to Step 3

3

Determine if a LH or RH turn signal is inoperative.

Is a LH turn signal inoperative?

Go to Step 14

Go to Step 4

4

Determine which of the following lamps are inoperative:

    • RH front turn signal lamp
    • RH rear turn signal lamp
    • Both the RH rear turn signal lamp and RH front turn signal lamp

Are both the RH rear turn signal lamp and RH front turn signal lamp inoperative?

Go to Step 25

Go to Step 5

5

Is the RH rear turn signal lamp inoperative?

Go to Step 6

Go to Step 8

6

Does the RH turn signal indicator illuminate when the turn signal switch is placed in the RH ON position?

Go to Step 7

Go to Step 10

7
  1. Locate an open or a high resistance in the power supply circuit or the ground circuit of the inoperative turn signal lamp. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the power supply circuit or the ground circuit of the inoperative turn signal lamp. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 26

8
  1. Probe the RH turn signal switch signal circuit 15 of the right front turn signal lamp connector with a test lamp that is connected to a good ground.
  2. Observe the test lamp while placing the turn signal switch in the RH ON position.

Does the test lamp illuminate?

Go to Step 13

Go to Step 9

9
  1. Test for an open or a high resistance in the RH turn signal switch signal circuit  15. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the RH turn signal switch signal circuit  15. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 11

10
  1. Test for an open or a high resistance in the RH turn signal switch signal circuit  19 . Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the circuit  19. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

11
  1. Probe the RH turn signal switch signal circuit 1415 of the Daytime Running Lamps (DRL) control module connector with a test lamp that is connected to a good ground.
  2. Observe the test lamp while placing the turn signal switch in the RH ON position.

Does the test lamp illuminate?

Go to Step 24

Go to Step 12

12
  1. Locate an open or a high resistance in the RH turn signal switch signal circuit  1415. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the RH turn signal switch signal circuit  1415. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

13
  1. Test for an open or a high resistance in the RH front turn signal lamps ground circuit 1250. Refer to Circuit Testing in Wiring Systems.
  2. Repair the open or a high resistance in the front turn signal lamps ground circuit 1250. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 26

14

Determine which of the following lamps are inoperative:

    • LH front turn signal lamp
    • LH rear turn signal lamp
    • Both the LH rear turn signal lamp and LH front turn signal v

Are both the LH rear turn signal lamp and LH front turn signal lamp inoperative?

Go to Step 25

Go to Step 15

15

Is the LH rear turn signal lamp inoperative?

Go to Step 16

Go to Step 18

16

Does the LH turn signal indicator illuminate when the turn signal switch is placed in the LH ON position?

Go to Step 17

Go to Step 20

17
  1. Locate an open or a high resistance in the power supply circuit or the ground circuit of the inoperative turn signal lamp. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the power supply circuit or the ground circuit of the inoperative turn signal lamp. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 26

18
  1. Probe the LH turn signal switch signal circuit 14 of the left front turn signal lamp connector with a test lamp that is connected to a good ground.
  2. Observe the test lamp while placing the turn signal switch in the LH ON position.

Does the test lamp illuminate?

Go to Step 23

Go to Step 19

19
  1. Test for an open or a high resistance in the LH turn signal switch signal circuit  14. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the LH turn signal switch signal circuit  14. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 21

20
  1. Test for an open or a high resistance in the LH turn signal switch signal circuit  18 . Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the circuit  18. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

21
  1. Probe the LH turn signal switch signal circuit 1414 of the Daytime Running Lamps (DRL) control module connector with a test lamp that is connected to a good ground.
  2. Observe the test lamp while placing the turn signal switch in the LH ON position.

Does the test lamp illuminate?

Go to Step 24

Go to Step 22

22
  1. Locate an open or a high resistance in the LH turn signal switch signal circuit  1414. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the LH turn signal switch signal circuit  1414. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

23
  1. Test for an open or a high resistance in the LH front turn signal lamps ground circuit 1350. Refer to Circuit Testing in Wiring Systems.
  2. Repair the open or a high resistance in the front turn signal lamps ground circuit 1350. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 26

24

Replace the Daytime Running Lamps (DRL) control module. Refer to Daytime Running Lights (DRL) Control Module Replacement .

Did you complete the repair?

Go to Step 27

--

25

Replace the turn signal switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle .

Did you complete the repair?

Go to Step 27

--

26
  1. Replace the inoperative front turn signal lamp. Refer to Park/Turn Signal/Side Marker Lamp Replacement in Lighting Systems.
  2. Replace the inoperative rear turn signal. Refer to Tail Lamp Replacement in Lighting Systems.

Did you complete the repair?

Go to Step 27

--

27
  1. Connect all connectors and components that were previously disconnected.
  2. Verify that the system operates properly.

Did you correct the condition?

System OK

Go to Step 2

Turn Signal Lamps Inoperative - Left or Right Side Export

Step

Action

Yes

No

1

Did you perform the 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 ON position.
  3. Place the turn signal switch in the RH ON position.
  4. Verify that either a RH or LH turn signal is inoperative.

Are the turn signals operating properly?

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

Go to Step 3

3

Determine if a LH or RH turn signal is inoperative.

Is a LH turn signal inoperative?

Go to Step 10

Go to Step 4

4

Determine which of the following lamps are inoperative:

    • RH front turn signal lamp
    • RH side marker turn signal lamp
    • RH rear turn signal lamp

Is the RH rear turn signal lamp inoperative?

Go to Step 5

Go to Step 7

5

Does the RH turn signal illuminate when the turn signal switch is in the RH ON position?

Go to Step 9

Go to Step 6

6
  1. Locate an open or a high resistance in the RH turn signal circuit  19 . Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the circuit  19. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 18

7

Determine which of the following lamps are inoperative:

    • RH front turn signal
    • RH side marker turn signal
    • Both the RH front turn signal and the RH side marker turn signal

Is only one of the RH turn lamps inoperative?

Go to Step 9

Go to Step 8

8
  1. Locate an open or a high resistance in the RH turn signal circuit  15. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the circuit  15. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 16

9
  1. Locate an open or a high resistance in the power supply circuit or the ground circuit of the inoperative turn signal lamp. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the power supply circuit or the ground circuit of the inoperative turn signal lamp. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 19

10

Determine which of the following lamps are inoperative:

    • LH front turn signal lamp
    • LH side marker turn signal lamp
    • LH rear turn signal lamp

Is the LH rear turn signal lamp inoperative?

Go to Step 11

Go to Step 13

11

Does the LH turn signal indicator illuminate when the turn signal switch is place in the LH ON position?

Go to Step 15

Go to Step 12

12
  1. Locate an open or a high resistance in the LH turn signal circuit  18 . Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the circuit  18. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 18

13

Determine which of the following lamps are inoperative:

    • LH front turn signal
    • LH side marker turn signal
    • Both the LH front turn signal and the LH side marker turn signal

Is only one of the LH turn lamps inoperative?

Go to Step 15

Go to Step 14

14
  1. Locate an open or a high resistance in the LH turn signal circuit  14. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the circuit  14. Refer to Wiring Repairs in wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 17

15
  1. Locate an open or a high resistance in the power supply circuit or the ground circuit of the Inoperative turn signal lamp. Refer to Circuit Testing in wiring Systems.
  2. Repair the open or a high resistance in the power supply circuit or the ground circuit of the inoperative turn signal lamp. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 19

16
  1. Locate an open or a high resistance in the RH front turn signal lamps ground circuit 1250. Refer to Circuit Testing in Wiring Systems.
  2. Repair the open or a high resistance in the front turn signal lamps ground circuit 1250. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 18

17
  1. Locate an open or a high resistance in the LH front turn signal lamps ground circuit 1350. Refer to Circuit Testing in Wiring Systems.
  2. Repair the open or a high resistance in the front turn signal lamps ground circuit 1350. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 18

18

Replace the turn signal switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle .

Did you complete the repair?

Go to Step 20

--

19
  1. Replace the inoperative front turn signal lamp. Refer to Park/Turn Signal/Side Marker Lamp Replacement in Lighting Systems.
  2. Replace the inoperative side marker turn signal lamp. Refer to Park/Turn Signal/Side Marker Lamp Replacement in Lighting Systems.
  3. Replace the inoperative rear turn signal. Refer to Tail Lamp Replacement in Lighting Systems.

Did you complete the repair?

Go to Step 20

--

20
  1. Connect all connectors and components that were previously disconnected.
  2. Verify that the system operates properly.

Did you correct the condition?

System OK

Go to Step 2