GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Turn the hazard lights on.

Does the hazard lights function properly?

--

Go to Step 16

Go to Step 2

2

Remove the TURN fuse and inspect.

Is the fuse open?

--

Go to Step 3

Go to Step 4

3

  1. Locate and repair CKT 139 (PNK) or CKT 1696 (GRY) for a short to ground.
  2. Replace the fuse.

Is the repair complete?

--

System OK

--

4

  1. Re- install the fuse.
  2. Connect a test lamp from (back probe) terminal A2 of C201A to ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 5

5

Locate and repair CKT 139 (PNK) for an open between turn/hazard switch and fuse.

Is the repair complete?

--

System OK

--

6

  1. Turn the left turn signal on.
  2. Connect a test lamp from (back probe) terminal A3 of C201A to ground.

Does the test lamp light?

--

Go to Step 7

Go to Step 15

7

  1. Gain access to the back of the left bussed electrical center (LBEC).
  2. Connect a test lamp from (back probe) terminal B5 of C1.

Does the test lamp light?

--

Go to Step 9

Go to Step 8

8

Locate and repair the open in CKT 1696 (GRY) between the LBEC and the switch.

Is the repair complete?

--

System OK

--

9

Connect a self powered test lamp (back probe) from terminal A12 of C1.

Does the test lamp light?

--

Go to Step 11

Go to Step 10

10

Locate and repair CKT 1850 (BLK) for an open to ground.

Is the repair complete?

--

System OK

--

11

Connect a test lamp (back probe) from terminal A10 of C1 to ground.

Does the test lamp light or flash?

--

Go to Step 13

Go to Step 12

12

Replace the turn/hazard flasher.

Is the repair complete?

--

System OK

--

13

Connect a test lamp (back probe) from terminal A5 of C201A to ground.

Does the test lamp light or flash?

--

Go to Step 15

Go to Step 14

14

Locate and repair the open in CKT 1696 (PPL) between the LBEC and the switch.

Is the repair complete?

--

System OK

--

15

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

Is the repair complete?

--

System OK

--

16

Remove the TURN fuse and inspect.

Is the fuse open?

--

Go to Step 17

Go to Step 18

17

  1. Locate and repair CKT 139 (PNK) or CKT 1696 (GRY) for a short to ground.
  2. Replace the fuse.

Is the repair complete?

--

System OK

--

18

  1. Re-install the fuse.
  2. Connect a test lamp from (back probe) terminal A2 of C201A to ground.

Does the test lamp light?

--

Go to Step 20

Go to Step 19

19

Locate and repair CKT 139 (PNK) for an open between turn/hazard switch and fuse.

Is the repair complete?

--

System OK

--

20

  1. Turn the left turn signal on.
  2. Connect a test lamp from (back probe) terminal A3 of C201A to ground.

Does the test lamp light?

--

Go to Step 14

Go to Step 15