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Home >> Chevrolet >> 2007 >> Optra LT, Automatic >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting >> Diagnostic Information and Procedures >> Low Beams Inoperative

Low Beams Inoperative

Step Action Values Yes No
1 Inspect fuses Ef20, left side headlamps, and Ef27, right side head lamps.
Is fuse Ef20 or Ef27 open?		 - Go to Step 2  Go to Step 3 
2
  1. Inspect for a short circuit and repair if necessary.
  2. Replace the fuse.
Did you complete the repair?		 - System OK -
3 Measure the voltage at fuses Ef20 and Ef27.
Does the voltage available at fuses Ef20 and Ef27 measure within the specified range?		 11-14 V Go to Step 4  Go to Step 9 
4
  1. Disconnect both headlamp connectors.
  2. Turn the headlamps ON.
  3. Select the low beams.
Does the voltage at each headlamp connector terminal 5 measure within the specified range?		 11-14 V Go to Step 6  Go to Step 5 
5 Repair the open circuit between fuses Ef20 or Ef27 and the low beam headlamps.
Did you complete the repair?		 - System OK -
6
  1. Disconnect the headlamp connectors.
  2. Connect an ohmmeter between ground and either headlamp connector terminal 6.
Is the resistance equal to the specified value?		 0 Ω Go to Step 8  Go to Step 7 
7 Repair the ground circuit.
Did you complete the repair?		 - System OK -
8 Replace the faulty headlamps.
Did you complete the replacement?		 - System OK -
9
  1. Disconnect the headlamp switch connector.
  2. Select the low beams.
  3. Use an ohmmeter to verify the continuity between terminals 6 and 5 of the headlamp switch.
Does the ohmmeter indicate the specified value?		 0 Ω Go to Step 10  Go to Step 11 
10 Replace the headlamp combination switch.
Did you complete the replacement?		 - System OK -
11 Repair the open circuit between fuses Ef20 and Ef27 and the headlamp switch connector terminal 5.
Did you complete the repair?		 - System OK -
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