GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Set the turn signal switch to the left turn position.
  2. Observe the operation of the left turn signal Indicator on the instrument cluster.

Does the left turn signal Indicator flash?

--

Go to Step 2

Go to Step 9

2

  1. Keep the turn signal switch in the left turn position.
  2. Disconnect the harness connector from the left front turn lamp assembly.
  3. Connect a test lamp between terminal A and terminal B on the left front turn lamp harness connector.

Does the test lamp flash?

--

Go to Step 3

Go to Step 4

3

Repair the open in the left front turn and park lamp assembly.

Is the repair complete?

--

System OK

--

4

Connect a test lamp between terminal A and chassis ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Repair the open in CKT 150 (BLK) between S 105 and terminal B in the left front turn lamp harness connector.

Is the repair complete?

--

System OK

--

6

  1. Disconnect the front chassis harness connector C 102.
  2. Connect a test lamp between terminal C and terminal G in the front chassis harness connector C 102.

Does the test lamp flash?

--

Go to Step 7

Go to Step 8

7

Repair the open in CKT 14 (LT BLU) between terminal C in the front turn signal harness connector C 102 and terminal A in the left front turn and park lamp harness connector.

Is the repair complete?

--

System OK

--

8

Repair the open in CKT 14 (LT  BLU) between S224 and terminal C in the front chassis harness connector C 102.

Is the repair complete?

--

System OK

--

9

Connect a test lamp from CKT 16 (PPL) at the multifunction switch to chassis ground.

Does the test lamp light?

--

Go to Step 10

Go to Step 11

10

Replace the multifunction switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column.

Is the repair complete?

--

System OK

--

11

Connect a test lamp from CKT 16 (PPL) at the hazard lamps flasher to chassis ground.

Does the test lamp light?

--

Go to Step 12

Go to Step 13

12

Locate and repair the open in CKT 16 (PPL) between the hazard lamps flasher and the multifunction switch.

Is the repair complete?

--

System OK

--

13

Connect a test lamp between CKT 1540 (ORN) at the hazard lamps flasher to chassis ground.

Does the test lamp light?

--

Go to Step 14

Go to Step 15

14

Replace the hazard lamps flasher.

Is the repair complete?

--

System OK

--

15

Locate and repair the open in CKT 1540 (ORN) between the IP fuse block and the hazard lamps flasher.

Is the repair complete?

--

System OK

--