GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Catera 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 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 ON position.
  3. Place the turn signal switch in the RH ON position.
  4. Determine if any of the turn signals or turn signal indicators are inoperative.

Are the turn signals and indicators operating properly?

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

Go to Step 3

3

Are all of the turn signals and indicators inoperative?

Go to Step 6

Go to Step 4

4

Determine if any LH turn signal is inoperative.

Is any LH turn signal inoperative?

Go to Step 19

Go to Step 5

5

Determine if any RH turn signal is inoperative.

Is any RH turn signal inoperative?

Go to Step 16

Go to Step 22

6

Inspect the Flasher Fuse #3 for an open.

Is the flasher fuse #3 open?

Go to Step 26

Go to Step 7

7

Inspect the HZD Fuse #12 for an open.

Is the HZD Fuse #12 open?

Go to Step 27

Go to Step 8

8
  1. Press the hazard warning switch in order to turn ON the hazard lamps.
  2. Determine if the hazard lamps operating.

Are the hazard lamps operating properly?

Go to Step 12

Go to Step 9

9
  1. Insure that the hazard warning switch is in the OFF position.
  2. Turn the ignition switch to the ON position.
  3. Disconnect the turn signal lamp flasher K10 connector.
  4. Connect a test lamp between the supply voltage circuit (P3) of the turn signal lamp flasher K10 connector and a known good ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 10

10
  1. Disconnect the hazard warning switch connector.
  2. Connect a test lamp between the ignition supply voltage circuit (X10) of the hazard warning switch connector and a known good ground.

Does the test lamp illuminate?

Go to Step 13

Go to Step 28

11

Connect a test lamp between the ground circuit (F12) of the turn signal lamp flasher K10 connector an B+.

Does the test lamp illuminate?

Go to Step 33

Go to Step 25

12
  1. Insure that the hazard warning switch is in the OFF position.
  2. Disconnect the turn signal lamp flasher K10 connector.
  3. Turn the ignition switch to the ON position.
  4. Connect a test lamp between supply voltage circuit (P3) of the turn signal lamp flasher K10 connector and a known good ground.

Does the test lamp illuminate?

Go to Step 14

Go to Step 15

13

Test for an open or high resistance in the supply voltage circuit (P3) of the turn signal lamp flasher. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 34

Go to Step 32

14

Test for an open or a high resistance in the signal circuit (FM91) of the turn signal lamp flasher. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 34

Go to Step 30

15

Test for an open or high resistance in the ignition supply voltage circuit (X10) of the hazard warning switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 34

Go to Step 32

16

Determine if the RH front turn signal, the RH rear turn signal, or both RH turn signals are inoperative.

Is only one of the turn signal lamps inoperative?

Go to Step 18

Go to Step 17

17

Test for an open or high resistance in the RH turn lamp supply voltage circuit (FU1,FU11) 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 34

Go to Step 30

18

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

Did you find and correct the condition?

Go to Step 34

Go to Step 31

19

Determine if the LH front turn signal, the LH rear turn signal, or both LH turn signals are inoperative.

Is only one of the turn signal lamps inoperative?

Go to Step 21

Go to Step 20

20

Test for an open or high resistance in the LH turn lamp supply voltage circuit (FM1,FM12) 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 34

Go to Step 30

21

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

Did you find and correct the condition?

Go to Step 34

Go to Step 31

22

If the turn signal indicators are inoperative, determine if one indicator is inoperative or both indicators are inoperative.

Is only one turn signal indicator inoperative?

Go to Step 23

Go to Step 29

23

Inspect the affected turn signal indicator bulb and replace if needed.

Was the turn signal indicator bulb defective?

Go to Step 34

Go to Step 24

24

Test the affected turn signal indicator circuit for a high resistance or open. Refer to Circuit Testing or Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 34

Go to Step 29

25

Repair an open or a high resistance in the ground circuit (F12) of the turn signal lamp flasher K10. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

26

Repair a short to ground in one of the following circuits:

    • The ignition supply voltage circuit (X9, X10) of the hazard warning switch
    • The supply voltage circuit (P3) of the turn signal lamp flasher K10

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

27

Repair a short to ground in the battery supply voltage circuit (A13,A9) of the hazard warning switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

28

Repair a open or high resistance in the supply voltage circuit (X10,X9) of the hazard warning switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

29

Important: Perform the set up procedure for the IP.

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

Did you complete the replacement and the set up procedure?

Go to Step 34

--

30

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

Is the replacement complete?

Go to Step 34

--

31
  1. Replace the inoperative park/turn signal lamp. Refer to Park/Turn Signal Lamp Bulb Replacement .
  2. Replace the inoperative rear turn signal. Refer to Rear Turn Signal Lamp Bulb Replacement .

Did you complete the repair?

Go to Step 34

--

32

Replace the hazard warning switch. Refer to Hazard Warning Switch Replacement .

Is the replacement complete?

Go to Step 34

--

33
  1. Check for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
  2. Replace the turn signal lamp flasher K10.

Is the replacement complete?

Go to Step 34

--

34
  1. Connect all connectors and components that were previously disconnected.
  2. Verify that the turn signal lamps and indicators operate properly.

Does the turn signal lamps and indicators operate properly?

System OK

Go to Step 2