GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1997 🢒 Catera 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Fog Lamps Inoperative - All

Fog Lamps Inoperative - All Both Fog Lamps Are Inoperative

Step

Action

Value(s)

Yes

No

1

Did you perform the Fog Lights Diagnostic System Check?

--

Go to Step 2

Go to Fog Lights System Check .

2
  1. Disconnect the multifunction relay K134 connector.
  2. Turn the ignition switch to the ON position.
  3. Use the DMM in order to measure the voltage between terminal 10 of the multifunction relay K134 connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 4

Go to Step 3

3
  1. Locate an open or a high resistance in circuit X820.
  2. Repair the open or the high resistance in CKT X820.

Is the repair complete?

--

Go to Step 19

--

4
  1. Turn the headlamp switch to the PARK position.
  2. Use the DMM in order to measure the voltage between terminal 3 of the multifunction relay K134 connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 6

Go to Step 5

5
  1. Locate an open or a high resistance in CKT  RF75.
  2. Repair the open or the high resistance in CKT RF75.

Is the repair complete?

--

Go to Step 19

--

6

Use the DMM in order to measure the voltage between terminal 1 of the multifunction relay K134 connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 8

Go to Step 7

7
  1. Locate an open or a high resistance in CKT FA888.
  2. Repair the open or the high resistance in CKT FA888.
  3. If CKT FA888 is OK, replace the right high beam headlamp relay K132.

Did you complete the repair?

--

Go to Step 19

--

8
  1. Disconnect the headlamp switch connector.
  2. Use the DMM in order to measure the resistance between terminal 13 of the headlamp switch connector and a known good ground.

Is the measured resistance within the specified value?

Less than 5 ohms

Go to Step 10

Go to Step 9

9
  1. Locate an open or a high resistance in CKT  F18.
  2. Repair the open or the high resistance in CKT F18.

Did you complete the repair?

--

Go to Step 19

--

10

Use the DMM in order to measure the resistance between terminal 10 of the headlamp switch connector and terminal  8 of the multifunction relay K134 connector.

Is the measured resistance within the specified value?

Less than 5 ohms

Go to Step 12

Go to Step 11

11
  1. Locate an open or a high resistance in CKT FP28.
  2. Repair the open or the high resistance in CKT FP28.

Did you complete the repair?

--

Go to Step 19

--

12
  1. Connect the multifunction relay K134 connector.
  2. Connect a fused jumper between terminal 10 and 13 of the headlamp switch connector.

Do the fog lamps turn ON?

--

Go to Step 13

Go to Step 14

13

Replace the fog lamp switch. Refer to Headlamp Switch Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step 19

--

14
  1. Disconnect both the left and the right fog lamp.
  2. Use the DMM in order to measure the voltage between terminal 1 of the left fog lamp and a known good ground.
  3. Use the DMM in order to measure the voltage between terminal 1 of the right fog lamp and a known good ground.

Is the measured voltage for both measurements within the specified value?

B+

Go to Step 16

Go to Step 15

15
  1. Locate and repair an open or a high resistance in circuits X1, X2, X3, FP27 and/or FP36.
  2. Repair the open or the high resistance in circuits X1, X2, X3, FP27 and/or FP36.
  3. If these circuits are OK, replace the multifunction relay K134.

Did you complete the repair?

--

Go to Step 19

--

16
  1. Use the DMM in order to measure the resistance between terminal 2 of the left fog lamp and a known good ground.
  2. Use the DMM in order to measure the resistance between terminal 2 of the right fog lamp and a known good ground.

Is the measured resistance for both measurements within the specified value?

Less than 5 ohms

Go to Step 18

Go to Step 17

17
  1. Locate an open or a high resistance in circuits  F1, F3 and/or F4.
  2. Repair the open or the high resistance in circuits F1, F3 and/or F4.

Did you complete the repair?

--

Go to Step 19

--

18

Replace the left and/or right fog lamps. Refer to Front Fog Lamp Bulb Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step 19

--

19
  1. Connect all connectors and components that were previously disconnected.
  2. Verify that the fog lamps operate properly.

Do the fog lamps operate properly?

--

Go to Fog Lights System Check

Go to Step 1

Fog Lamps Inoperative - All LH Fog Lamp Illuminates

Step

Action

Value(s)

Yes

No

2

Was the Fog Lights System Check performed?

--

Go to Step 2

Go to Fog Lights System Check .

2
  1. Disconnect the RH fog lamp connector.
  2. Use the DMM to measure the voltage between terminal 1 of the RH fog lamp connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 4

Go to Step 3

3
  1. Locate an open or a high resistance in circuit X3.
  2. Repair the open or the high resistance in circuit X3.

Is the repair complete?

--

Go to Step 7

--

4

Use the DMM to measure the resistance between terminal 2 of the RH fog lamp connector and a known good ground.

Is the measured resistance within the specified value?

Less than 5 ohms

Go to Step 6

Go to Step 5

5
  1. Locate an open or a high resistance in circuit F4.
  2. Repair the open or the high resistance in circuit F4.

Is the repair complete?

--

Go to Step 7

--

6

Replace the RH fog lamp. Refer to Front Fog Lamp Bulb Replacement in Lighting Systems.

Is the replacement complete?

--

Go to Step 7

--

7
  1. Connect all connectors and components that were disconnected.
  2. Verify that the RH fog lamp operates properly.

Does the RH fog lamp operate properly?

--

Go to Fog Lights System Check .

Go to Step 1

Fog Lamps Inoperative - All RH Fog Lamp Illuminates

Step

Action

Value(s)

Yes

No

1

Was the Fog Lights System Check performed?

--

Go to Step 2

Go to Fog Lights System Check .

2
  1. Disconnect the LH fog lamp connector.
  2. Use the DMM to measure the voltage between terminal 1 of the LH fog lamp connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 4

Go to Step 3

3
  1. Locate an open or a high resistance in circuit X2.
  2. Repair the open or the high resistance in circuit X2.

Is the repair complete?

--

Go to Step 7

--

4

Use the DMM to measure the resistance between terminal 2 of the LH fog lamp connector and a known good ground.

Is the measured resistance within the specified value?

Less than 5 ohms

Go to Step 6

Go to Step 5

5
  1. Locate an open or a high resistance in circuit F3.
  2. Repair the open or the high resistance in circuit F3.

Is the repair complete?

--

Go to Step 7

--

6

Replace the LH fog lamp. Refer to Front Fog Lamp Bulb Replacement in Lighting Systems.

Is the replacement complete?

--

Go to Step 7

--

7
  1. Connect all connectors and components that were disconnected.
  2. Verify that the LH fog lamp operates properly.

Does the LH fog lamp operate properly?

--

Go to Fog Lights System Check .

Go to Step 1