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Home >> Chevrolet >> 2007 >> Optra5 LS, Standard >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting >> Diagnostic Information and Procedures >> Front Fog Lamps Inoperative (1.6L and 1.8L) >> Diagnostic Aids

Diagnostic Aids

The front fog lamps will not operate unless the illumination lamps or daytime running lamps are ON. If the illumination lamps or daytime running lamps are not operating, repair that problem before attempting to diagnose the fog lamps.

Step Action Values Yes No
1 Inspect fuse Ef24.
Is fuse Ef24 open?		 - Go to Step 2  Go to Step 3 
2
  1. Inspect for a short circuit and repair it, if necessary.
  2. Replace the fuse.
Did you complete the action?		 - System OK -
3 Use a voltmeter to inspect fuse Ef24.
Does the battery voltage available at fuse Ef24 measure within the specified range?		 11-14 V Go to Step 5  Go to Step 4 
4 Repair the open circuit from the battery to fuse Ef24.
Did you complete the repair?		 - System OK -
5 Remove the fog lamp relay and temporarily substitute a known good relay, such as the headlamp relay. Do not substitute the illumination lamp relay.
Do the fog lamps work with the substituted relay?		 - Go to Step 6  Go to Step 7 
6
  1. Return the substituted relay to its original position.
  2. Replace the inoperative fog lamp relay.
Did you complete the replacement?		 - System OK -
7
  1. Return the substituted relay to its original position, but do not reinstall the fog lamp relay.
  2. Turn ON the exterior lamps and the front fog lamps.
  3. Using a voltmeter, inspect the fog lamp relay socket at the connector for fog lamp relay terminal 30.
Does the voltage available at the fog lamp relay socket measure within the specified range?		 11-14 V Go to Step 9  Go to Step 8 
8 Repair the open circuit between fuse Ef24 and the fog lamp relay.
Did you complete the repair?		 - System OK -
9 At the fog lamp relay socket, use an ohmmeter to verify that the connector for relay terminal 85 is connected to ground.
Is the resistance equal to the specified value?		 0 Ω Go to Step 11  Go to Step 10 
10 Repair the ground circuit for the fog lamp relay.
Did you complete the repair?		 - System OK -
11
  1. Reinstall the fog lamp relay.
  2. Turn ON the exterior lamps and the front fog lamps.
  3. Test for voltage at terminal 2 of the fog lamp connector.
Does the battery voltage available at terminal 2 of the fog lamp connector measure within the specified range?		 11-14 V Go to Step 13  Go to Step 12 
12 Repair the open circuit between the fog lamp relay terminal 87 and the fog lamps.
Did you complete the repair?		 - System OK -
13 Use an ohmmeter, or test lamp, to check the ground at terminal 1 of the fog lamp connector.
Is the resistance equal to the specified value?		 0 Ω Go to Step 15  Go to Step 14 
14 Repair the fog lamp ground circuit.
Did you complete the repair?		 - System OK -
15 Replace the faulty fog lamp bulbs.
Did you complete the replacement?		 - System OK -
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