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Old 09-03-2003, 12:43 AM   #1
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Default Quad Driver Mod A Circuit

Right, I did a code check on my 89 SSE, I came up with code 26, look that up it says its a Quad Driver Module A Circuit, someone wanna tell me what that is? Thanks
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Old 09-03-2003, 12:49 AM   #2
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Oh just so everyone knows, I know **** all about bonnevilles,
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Old 09-03-2003, 12:51 PM   #3
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Quad drivers are amplifier circuits. On the "C" engine #1 handles the SES light and canister purge solenoid. #2 the a/c and cooling fans relays, #3 the HOT light and TCC solenoid, and #4 the three EGR circuits. Factory Service manual has several pages of diagnosis. Note: code 26 sets because an electrical fault was detected (e.g. loose ERG connector). It will not set on a mechanical fault (e.g. stuck ERG).

If the SES light is acting properly, lockup is occurring, and the cooling fans are on with A/C then it is probably the EGR circuit.
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