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 left front turn and park lamp assembly.

Is the repair complete?

--

System OK

--

4

Connect a test lamp between terminal A and the chassis ground on the left front turn lamp connector.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Repair the open in CKT 150 (BLK) between S105 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 C105.
  2. Connect a test lamp between terminal B and terminal D in the Front Chassis Harness Connector C105.

Does the test lamp flash?

--

Go to Step 7

Go to Step 8

7

Repair the open in CKT 14 (LT BLU) between terminal B in the front turn signal harness connector C105 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 or CKT 136 (LT BLU) between S259 and terminal B in the front chassis harness connector C105.

Is the repair complete?

--

System OK

--

9

  1. Disconnect the harness connector from the Turn and Hazard Flasher.
  2. Remove the left turn trailer relay from the socket.
  3. Connect a J 39200 between terminal 86 in the left trailer turn relay socket and terminal 1 in the turn and hazard flasher harness connector.

Does the DMM indicate continuity?

--

Go to Step 10

Go to Step 11

10

  1. Keep the turn signal switch in the Left turn position.
  2. Connect a J 39200 between terminal 7 in the turn and hazard flasher harness connector and the chassis ground.

Does the DMM indictate continuity?

--

Go to Step 12

Go to Step 13

11

Repair the open CKT 136 (LT BLU) between S259 and terminal 1 in the Turn and Hazard Flasher harness connector.

Is the repair complete?

--

System OK

--

12

Replace the Turn/Hazard Flasher.

Is the repair complete?

--

System OK

--

13

  1. Keep the J 39200 connected.
  2. Disconnect the harness connector C 1 from the Turn Signal and Hazard Switch.
  3. Remove the chassis ground connection from the J 39200 and connect the J 39200 to terminal 6 in the Turn Signal and Hazard Switch harness connector.

Does the DMM indicate continuity?

--

Go to Step 14

Go to Step 15

14

Replace the Turn Signal and Hazard Switch.

Is the repair complete?

--

System OK

--

15

Repair the open in CKT 132 (BLU/BLK) between the Turn Signal and Hazard Switch and the Turn and Hazard Flasher.

Is the repair complete?

--

System OK

--