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Ambient Temp Sensor 1990 760 GLE 700

posted by  Bill N.Z. on  Fri Aug 2 13:33 CST 2002
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How do I check for failure of the ambient temp sensor The A/C button light on control panel is flashing continuosly, and in code mode flashes 121. FAQ lists this code as:= Ambient Temp sensor on blower housing. short circuit to ground.
The A/C button continues to flash with plug removed from sensor. Is this fault in the control unit, or will a failed or disconnected sensor cause this code to flash. Thanks for any help.
Regards Bill N.Z.
wmunden@hnpl.net








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Ambient Temp Sensor 1990 760 GLE 700

uid 5241's pic
posted by  760T man on  Mon Aug 5 09:57 CST 2002
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It will flash ifany sensor on the system is failing in any way (including disconnected).
--
Cullen Wassell / Newmarket NH - '90 764ti / 256,000








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Ambient Temp Sensor 1990 760 GLE 700

posted by  Bill N.Z. on  Mon Aug 5 14:35 CST 2002
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Thanks for your reply Cullen. I could accept the continuos flashing as indicating a sytem fault,but when set to flash fault code with sensor and wire attachments to climate control unit removed, it still flashes 121=
Ambient Temp Sensor "Short circuit to ground." I can only guess that the fault is in the circuit that the sensor is connected to within the control unit?
Regards Bill N.Z.

P.S. Nice photo of your car







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