GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Exterior Lights System Check?

--

Go to Step  2

Go to Exterior Lights System Check

2

Exchange the fog lamp relay with known good relay.

Do the fog lamps operate?

--

Go to Step  3

Go to Step  4

3

Replace the fog lamp relay.

Did you complete the repair?

--

Go to Exterior Lights System Check

--

4

Exchange the fog lamp cutoff relay with a known good relay.

Do the fog lamps operate?

--

Go to Step  5

Go to Step  6

5

Replace the fog lamp cutoff relay.

Did you complete the repair?

--

Go to Exterior Lights System Check

--

6

  1. Place the turn/hazard headlamp switch in the PARK position.
  2. Use a test lamp in order to backprobe the fog lamp switch between terminal B and ground.

Does the test lamp illuminate?

--

Go to Step  7

Go to Step  8

7

  1. Turn the fog lamp switch to the ON position.
  2. Backprobe the fog lamp switch between terminal A and ground.

Does the test lamp illuminate?

--

Go to Step  9

Go to Step  10

8

Repair the open in CKT 32 between S232 and the fog lamp switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Exterior Lights System Check

--

9

  1. Disconnect the fog lamp relay.
  2. Connect the test lamp between the fog lamp harness connector terminal 86 and ground.

Does the test lamp illuminate?

--

Go to Step  11

Go to Step  12

10

Replace the fog lamp switch.

Did you complete the repair?

--

Go to Exterior Lights System Check

--

11

  1. Disconnect the fog lamp cutoff relay.
  2. Connect the test lamp between terminal 86 of the fog lamp cutoff relay harness connector and ground.

Does the test lamp illuminate?

--

Go to Step  13

Go to Step  14

12

Repair the open in CKT 317 between the fog lamp switch and the fog lamp relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Exterior Lights System Check

--

13

  1. Reconnect the fog lamp relay.
  2. Connect a fused jumper between terminal 87A of the fog lamp cutoff harness connector and ground.

Do the fog lamps operate?

--

Go to Step  15

Go to Step  16

14

Repair the open in CKT 940 between S151 and the fog lamp cutoff relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Exterior Lights System Check

--

15

Repair an open in CKT 150 between the fog lamp cutoff relay and G102. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Exterior Lights System Check

--

16

  1. Reconnect the fog lamp cutoff relay.
  2. Disconnect the fog lamp relay.
  3. Connect the test light between terminal 30 and terminal 86 of the fog lamp relay harness connector.

Does the test light illuminate?

--

Go to Step  17

Go to Step  18

17

Connect the test lamp between terminal 85 and terminal 86 of the fog lamp relay harness connector and ground.

Does the test light illuminate?

--

Go to Step  19

Go to Step  20

18

Repair the open in CKT 1317 between the fog lamp cutoff relay and the fog lamp relay.

Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Exterior Lights System Check

--

19

Repair the open in CKT 34 between the fog lamp relay and S122. Refer to Wiring Repairs In Wiring Systems.

Did you complete the repair?

--

Go to Exterior Lights System Check

--

20

Repair the open in CKT 150 between the fog lamp relay and S115. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Exterior Lights System Check

--