Do Bonnevilles have built in diagnostics? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-18-2006, 05:11 PM   #1
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Default Do Bonnevilles have built in diagnostics?

I know at least with Reattas, if you have auto climate control (they all do) you can hold OFF and WARMER and the system will enter service mode, and you can have access to all the sensor readings/counts and control ECM/BCM things manually. I'm thinking this applies to other GM vehicles, but not sure. The display would be the odometer, though in my '89, it'* the touch screen ECC.
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Old 11-18-2006, 07:08 PM   #2
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Yeah. 87-93 bonnies. Display is the ECC itself.
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Old 11-22-2006, 09:50 PM   #3
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Ah, ok. Was wondering about this.
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