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Re: EXH light
Posted by Larry West (more from Larry West) on Mon, 22 May 2000 15:01:34
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

The EXH light is controlled by an odometer switch. An extra cable 
runs from the speedo down to this device, mounted to the passenger 
side of the firewall. On 8v motors, it counts to 30,000, then 
switches the light on, on 16v motors, it will count to 60,000 (heated 
oxygen sensor).

The purpose of the light is to tell you to change the oxygen sensor.

Later 900s, 9000s, etc, don't use this. The ECU switches on a light 
if it detects a problem.

You can usually reach the switch by snaling your hand up from below, 
feeling 'round for the cable (it feels distinctly different from the 
wires), and the bitton to reset the counter is right next to the 
cable in the device.

If this doesn't put out the light, then it may well be a short 
somewhere. But the majority of the 'disappearing wiring harness' 
problems happen under the hood, not behind the firewall...

-- 
Larry West
NJ Saab Owner's Club

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