Head up Dispaly - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-23-2003, 06:51 PM   #11
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i just want to make sure you did understand what i was saying? ok everything works on the heads up display but the speed remains blank in working condtion are the blinkers,high beams, check gauges, etc we on the same page?
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Old 09-23-2003, 07:15 PM   #12
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Is the brightness on the HUD up all the way?
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Old 09-23-2003, 07:17 PM   #13
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yup !!!!!!
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Old 09-23-2003, 07:23 PM   #14
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....and you checked your fuses....
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Old 09-23-2003, 07:27 PM   #15
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fuses wouldnt matter cuz everything works but the actual speed does not light up unless the speed sensor is shot? i dont know too much about these motors or the car it self
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Old 09-23-2003, 07:31 PM   #16
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Well, you came to the right place. If we can't help, more than likely you'll have to go to the dealer.
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Old 09-23-2003, 09:19 PM   #17
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I'm with ya.

Always check the fuse first. It'* possible, although unlikely, that the other indicators are not powered by the control module.

Need to know if the speed signal is getting to the HUD (The dark green and white wire). Your speed sensor is fine, unless you are having problems with the speedometer too.
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Old 09-23-2003, 09:33 PM   #18
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what does this require in disasemblely of the dash? can i just go under? or does the hud unit just pop out of the top? dark green and white should have power when? both should have power?
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Old 09-23-2003, 09:53 PM   #19
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Definitely check the fuse first.

The voltage comes from the HUD to the PCM. The PCM sends 4000 grounds per mile. The HUD senses voltage drops.

You can test the wire at the PCM for voltage. Disconnect the green wiring harness. Look into the plug with the clip on the top and the wires in the back.

Ignition on (engine doesn't have to be on)

Second row, terminal No. 7 should have a dark green and white wire hooked to it. Test the voltage at the dark green and white wire by connecting a voltmeter to it (and the other side of the voltmeter to ground)

Should be 12V coming from the HUD.
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Old 09-23-2003, 10:02 PM   #20
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i'll get back to you on that next week or so k?
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