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Old 07-28-2006, 10:22 PM   #1
blackeagle1
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Default Electrical Issue

The DRL indicator lamp, high beam indicator lamp and right high beam does not work on my 97 SC2. The DRL's are fine as well as the left high beam. According the electrical schematic, the right high beam goes through the DRL relay. I checked all the fuses and DRL relay and everything is OK. I'm thinking the problem may either be in the instrument cluster or possibly headlamp switch. Any ideas?

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Old 07-28-2006, 11:14 PM   #2
97coupe
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Default Re: Electrical Issue

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Originally Posted by blackeagle1
The DRL indicator lamp, high beam indicator lamp and right high beam does not work on my 97 SC2. The DRL's are fine as well as the left high beam. According the electrical schematic, the right high beam goes through the DRL relay. I checked all the fuses and DRL relay and everything is OK. I'm thinking the problem may either be in the instrument cluster or possibly headlamp switch. Any ideas?

The wiring is a bit "messy". The left and right headlight are not feed off of a common feed. GM also turns the headlights on and of at switch by switching the ground to them not the power feed. The power for right headlight does come from DRL relay area but not relay itself but through a fuse that feeds a relay terminal to that power DRL lights too. From looking at the schematic for a while I suggest that you check your common grounds because if one opens up it could cause whet you are seeing. Car schematics are never pretty or striaght forward but this design is really even a bit out of the ordinary.

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Old 07-30-2006, 02:51 PM   #3
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Default Re: Electrical Issue

Thanks for the help. I have some schematics from the factory service manual and have tried to trace things down. Are the separate circuits for left and right high beams a failsafe so they don't both go out at once if there is a wiring problem? I'm an automotive electrical engineer and have spent a ton of time reading and drawing schematics but this one has me a little stumped.

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Old 07-30-2006, 03:02 PM   #4
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Default Re: Electrical Issue

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Originally Posted by blackeagle1
Thanks for the help. I have some schematics from the factory service manual and have tried to trace things down. Are the separate circuits for left and right high beams a failsafe so they don't both go out at once if there is a wiring problem? I'm an automotive electrical engineer and have spent a ton of time reading and drawing schematics but this one has me a little stumped.
Engineer here too (electric but not automotive though principals are the same) but this car schematic is not too clear at times and is not my normal reading. What they appear to have done is tied the positive feeds for left head light and left running light together, and right headlight and running light together and switch the grounds around to power them. My guess too is too is to prevent complete headlight circuit failure by spliting it up. Check the feeds on the right side and the grounds it uses. I find the concept of switching grounds to power them a bit disturbing in design.

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